Pub Date : 2025-02-13DOI: 10.1016/j.porgcoat.2025.109130
Jie Yu, Ruihong Jiang, DaYu Song
Aiming at the problem of insufficient weathering resistance of traditional fluorine-free transparent back sheet coatings, this study innovatively grafted carbodiimide onto polyurethane-acrylic resins through carbon‑nitrogen double bonding and carboxyl acylation reaction to develop a new type of transparent protective coatings, which possesses excellent thermal stability, strong adhesion, and resistance to humidity and heat. Meanwhile, to solve the problems of poor stability of UV absorbers and shielding agents affecting transparency, 3-Glycidyloxypropyltrimethoxysilane was coated onto the surface of cerium oxide nanoparticles using in situ modification technology, resulting in a new anti-UV agent with balanced transmittance and UV-resistant performance. The experimental results show that the initial bond strength of the coating reaches 13.15 N/cm, and it still exceeds 12 N/cm after 168 h of humid-heat aging, the yellowing index is less than 3 and the light transmittance is more than 90 % under the UV irradiation of 60 kWh-m−2, which confirms its long-term stability in the harsh environment.
{"title":"Preparation and performance study of carbodiimide-modified polyurethane-acrylic resin composite coatings with high transparency, strong adhesion, and excellent weathering performance","authors":"Jie Yu, Ruihong Jiang, DaYu Song","doi":"10.1016/j.porgcoat.2025.109130","DOIUrl":"10.1016/j.porgcoat.2025.109130","url":null,"abstract":"<div><div>Aiming at the problem of insufficient weathering resistance of traditional fluorine-free transparent back sheet coatings, this study innovatively grafted carbodiimide onto polyurethane-acrylic resins through carbon‑nitrogen double bonding and carboxyl acylation reaction to develop a new type of transparent protective coatings, which possesses excellent thermal stability, strong adhesion, and resistance to humidity and heat. Meanwhile, to solve the problems of poor stability of UV absorbers and shielding agents affecting transparency, 3-Glycidyloxypropyltrimethoxysilane was coated onto the surface of cerium oxide nanoparticles using in situ modification technology, resulting in a new anti-UV agent with balanced transmittance and UV-resistant performance. The experimental results show that the initial bond strength of the coating reaches 13.15 N/cm, and it still exceeds 12 N/cm after 168 h of humid-heat aging, the yellowing index is less than 3 and the light transmittance is more than 90 % under the UV irradiation of 60 kWh-m<sup>−2</sup>, which confirms its long-term stability in the harsh environment.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109130"},"PeriodicalIF":6.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.porgcoat.2025.109145
Yanhua Su , Jianyang Shi , Shuang Wang , Haibo Wang , Zongliang Du , Jinghong Qiu , Xu Cheng
Passive radiative cooling (PRC) is a novel form of cooling with zero pollution and zero energy consumption, which cools objects by reflecting sunlight and radiating heat to cold outer space. In this study, PTFE as the functional filler, PU as binder, SiO2 with high infrared emissivity as the end agent in the PU, MEK and DMF as solvents were used to prepare microporous radiative cooling films. PTFE powder enhances the films' solar rflectivity, hydrophobic properties, and UV aging resistance. Using MEK and DMF as solvents eliminates the requirement for a complicated preparation procedure, and the direct drying approach may be used to create the porous coating films. When the average solar irradiance is 860 W/m2, the average temperature of the films decreases by 16.4 °C, and the average radiative cooling power reaches 130 W/m2. These films also demonstrate excellent hydrophobicity with a water contact angle of 134°. Notably, they retain their cooling efficiency and hydrophobic properties after 200 h of ultraviolet exposure, show amazing environmental durability and ensuring a sustained daytime radiative cooling effect.
{"title":"A flexible and superhydrophobic PTFE/PU-SiO2 complex coating with synergistic effect for enhancement of passive daytime radiative cooling","authors":"Yanhua Su , Jianyang Shi , Shuang Wang , Haibo Wang , Zongliang Du , Jinghong Qiu , Xu Cheng","doi":"10.1016/j.porgcoat.2025.109145","DOIUrl":"10.1016/j.porgcoat.2025.109145","url":null,"abstract":"<div><div>Passive radiative cooling (PRC) is a novel form of cooling with zero pollution and zero energy consumption, which cools objects by reflecting sunlight and radiating heat to cold outer space. In this study, PTFE as the functional filler, PU as binder, SiO<sub>2</sub> with high infrared emissivity as the end agent in the PU, MEK and DMF as solvents were used to prepare microporous radiative cooling films. PTFE powder enhances the films' solar rflectivity, hydrophobic properties, and UV aging resistance. Using MEK and DMF as solvents eliminates the requirement for a complicated preparation procedure, and the direct drying approach may be used to create the porous coating films. When the average solar irradiance is 860 W/m<sup>2</sup>, the average temperature of the films decreases by 16.4 °C, and the average radiative cooling power reaches 130 W/m<sup>2</sup>. These films also demonstrate excellent hydrophobicity with a water contact angle of 134°. Notably, they retain their cooling efficiency and hydrophobic properties after 200 h of ultraviolet exposure, show amazing environmental durability and ensuring a sustained daytime radiative cooling effect.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109145"},"PeriodicalIF":6.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new bio-polyol silane-functionalized hydroxyl telechelic natural rubber (SHTNR) was successfully synthesized from hydroxyl telechelic natural rubber (HTNR) with molecular weight 3500 g.mol−1 using (3-mercaptopropyl) trimethoxysilane (MPTMS) and Darocur1173 as photoinitiator, via thiol-ene click reaction. The photoinitiator content, reaction time, and the MPTMS content for the SHTNR synthesis were studied. The chemical structure of SHTNR was confirmed by FTIR, 1H NMR, 13C NMR, and 29Si NMR spectroscopy. The kinetics of thiol-ene click reactions were monitored by 1H NMR. The percentage of double bond conversion and the molecular weight of SHTNR increased with photoinitiator content, with reaction time and depended on MPTMS amount. Waterborne polyurethane (WPU) was synthesized from HTNR by emulsion polymerization. In addition, a series of SHTNR were used as a functional bio-polyol in the preparation of hybrid waterborne polyurethane (HWPU) for comparison with WPU, giving stable dispersions and a total solid content of about 15 %. The particle size and the negative zeta potential values increased with the degree of silane functionalization in the HWPU, with a shelf-life of less than 3 months. The shape and morphology of WPU and a series of HWPU particles were observed by Transmission Electron Microscopy, an average diameter of 180 nm was measured. The HWPU films exhibited better tensile strength and thermal stability than WPU ones. Moreover, the activation energy of the degradation increased with increasing degree of silane functionalization in HWPU film. In addition, the incorporation of silanol group in HWPU films was confirmed by SEM-EDX spectroscopy. The experimental results demonstrated the benefit of using natural rubber from renewable resources and thiol-ene reaction to form a new bio-polyol to produce hybrid polyurethane dispersions that could serve as an alternative in green coating applications.
{"title":"Synthesis of silane-functionalized polyols from natural rubber by thiol-ene click reaction and preparation of waterborne polyurethane films","authors":"Anutida Suwan , Nathapong Sukhawipat , Anuwat Saetung , Nitinart Saetung , Pamela Pasetto","doi":"10.1016/j.porgcoat.2025.109109","DOIUrl":"10.1016/j.porgcoat.2025.109109","url":null,"abstract":"<div><div>A new bio-polyol silane-functionalized hydroxyl telechelic natural rubber (SHTNR) was successfully synthesized from hydroxyl telechelic natural rubber (HTNR) with molecular weight 3500 g.mol<sup>−1</sup> using (3-mercaptopropyl) trimethoxysilane (MPTMS) and Darocur1173 as photoinitiator, via thiol-ene click reaction. The photoinitiator content, reaction time, and the MPTMS content for the SHTNR synthesis were studied. The chemical structure of SHTNR was confirmed by FTIR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, and <sup>29</sup>Si NMR spectroscopy. The kinetics of thiol-ene click reactions were monitored by <sup>1</sup>H NMR. The percentage of double bond conversion and the molecular weight of SHTNR increased with photoinitiator content, with reaction time and depended on MPTMS amount. Waterborne polyurethane (WPU) was synthesized from HTNR by emulsion polymerization. In addition, a series of SHTNR were used as a functional bio-polyol in the preparation of hybrid waterborne polyurethane (HWPU) for comparison with WPU, giving stable dispersions and a total solid content of about 15 %. The particle size and the negative zeta potential values increased with the degree of silane functionalization in the HWPU, with a shelf-life of less than 3 months. The shape and morphology of WPU and a series of HWPU particles were observed by Transmission Electron Microscopy, an average diameter of 180 nm was measured. The HWPU films exhibited better tensile strength and thermal stability than WPU ones. Moreover, the activation energy of the degradation increased with increasing degree of silane functionalization in HWPU film. In addition, the incorporation of silanol group in HWPU films was confirmed by SEM-EDX spectroscopy. The experimental results demonstrated the benefit of using natural rubber from renewable resources and thiol-ene reaction to form a new bio-polyol to produce hybrid polyurethane dispersions that could serve as an alternative in green coating applications.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109109"},"PeriodicalIF":6.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-10DOI: 10.1016/j.porgcoat.2025.109136
Tingting Sang , Shaopeng Fu , Yichun Peng , Mingzhe Li , Sanshan Du , Jiaqi Song , JinPeng Dai , Zezhou Liang , Jianfeng Li
Iodine nitrotetrazolium violet (INT) is commonly used in the fields of biology and medicine. Nitrogen-containing heterocycles typically exhibit good corrosion inhibition effects. Therefore, INT exhibits potential as a corrosion inhibitor in the realm of corrosion control. The applicability of tetrazolium derivatives INT in the area of anti-corrosion was explored through experimental investigations and computational analyses. In this research, electrochemistry technique was applied to investigate the corrosion prevention impact of INT on mild steel in 1 M HCl. Electrochemical testing indicated that the inhibitor INT with a concentration of 0.4 mM had the best corrosion inhibition effect at room temperature of 298.15 K, with an efficiency of up to 98.38 %. In addition, the effect of the addition of KI or KCl on the corrosion inhibition properties was also investigated. Adsorption curves were used to describe the adsorption behaviour and INT was found to conform to the Langmuir adsorption isotherm. Scanning electron microscopy (SEM), laser scanning confocal microscopy (LSCM), contact angle (CA) and X-ray photoelectron spectroscopy (XPS) provided additional evidence of the protective effect of INT on the metal substrate. Molecular dynamics simulations and quantum chemical calculations were carried out to gain insight into the adsorption mechanism. It was found that INT molecules covered the surface of mild steel to the maximum extent through parallel adsorption and form π complexes with the MS surface. Overall, there is consistency between the experimental and theoretical findings, revealing that INT has a notable inhibitory effect on corrosion.
{"title":"Corrosion resistance of mild steel under acidic conditions using iodine nitrotetrazolium violet: Experimental and theoretical research","authors":"Tingting Sang , Shaopeng Fu , Yichun Peng , Mingzhe Li , Sanshan Du , Jiaqi Song , JinPeng Dai , Zezhou Liang , Jianfeng Li","doi":"10.1016/j.porgcoat.2025.109136","DOIUrl":"10.1016/j.porgcoat.2025.109136","url":null,"abstract":"<div><div>Iodine nitrotetrazolium violet (INT) is commonly used in the fields of biology and medicine. Nitrogen-containing heterocycles typically exhibit good corrosion inhibition effects. Therefore, INT exhibits potential as a corrosion inhibitor in the realm of corrosion control. The applicability of tetrazolium derivatives INT in the area of anti-corrosion was explored through experimental investigations and computational analyses. In this research, electrochemistry technique was applied to investigate the corrosion prevention impact of INT on mild steel in 1 M HCl. Electrochemical testing indicated that the inhibitor INT with a concentration of 0.4 mM had the best corrosion inhibition effect at room temperature of 298.15 K, with an efficiency of up to 98.38 %. In addition, the effect of the addition of KI or KCl on the corrosion inhibition properties was also investigated. Adsorption curves were used to describe the adsorption behaviour and INT was found to conform to the Langmuir adsorption isotherm. Scanning electron microscopy (SEM), laser scanning confocal microscopy (LSCM), contact angle (CA) and X-ray photoelectron spectroscopy (XPS) provided additional evidence of the protective effect of INT on the metal substrate. Molecular dynamics simulations and quantum chemical calculations were carried out to gain insight into the adsorption mechanism. It was found that INT molecules covered the surface of mild steel to the maximum extent through parallel adsorption and form π complexes with the MS surface. Overall, there is consistency between the experimental and theoretical findings, revealing that INT has a notable inhibitory effect on corrosion.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109136"},"PeriodicalIF":6.5,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-09DOI: 10.1016/j.porgcoat.2025.109098
Yunyun Yang, Ben Liu, Tong Zhang, Yi Wu, Peiyue Wang, Changhui Liu, Yanlong Shi, Shijie Mu
To form an intrinsic photothermal, high-strength and recyclability coating, a series of photothermal phase-change polyurethane materials which incorporates metal ions as coordination bonds was designed by polyethylene glycols of different molecular weights (6000, 8000, 10,000), diphenylmethane-4,4′-diisocyanate (MDI), zinc acetate, 1,5-naphthalenediol, p-benzoquinone dioxime, and triethanolamine (TEA). The photothermal phase-change polyurethane samples which synthesized with p-benzoquinone dioxime and 1,5-naphthalenediol as chain extenders, were named PUP-B (Li et al., 2024; Shi et al., 2021; Zhao et al., 2024 (6, 8, 10)) and PUP-N (Li et al., 2024; Shi et al., 2021; Zhao et al., 2024 (6, 8, 10)), respectively. To investigate their recyclability, these samples were dissolved and coated onto glass slides to obtain new polyurethane samples. After lighting for 420 s, the temperature of samples remained around 35–45 °C for approximately 5 min during cooling cycles, indicating excellent photothermal energy storage performance. The average maximum stress of PUP-B (10) and PUP-N (10) was 14.25 MPa and 11.96 MPa, respectively, while the average strain was 637 % and 486.44 %, demonstrating good tensile properties of the polyurethane material with PEG10K as the soft segments. The maximum water contact angle of the samples was 142.78°, indicating good hydrophobicity of the prepared samples. The recyclability, hydrophobicity, and photothermal energy storage capabilities of these materials make them suitable as green coating materials, providing new ideas for the development of aircraft anti-icing solutions.
{"title":"Improved design, analysis, preparation and properties of photothermal phase-change polyurethane materials based on zinc ion coordination","authors":"Yunyun Yang, Ben Liu, Tong Zhang, Yi Wu, Peiyue Wang, Changhui Liu, Yanlong Shi, Shijie Mu","doi":"10.1016/j.porgcoat.2025.109098","DOIUrl":"10.1016/j.porgcoat.2025.109098","url":null,"abstract":"<div><div>To form an intrinsic photothermal, high-strength and recyclability coating, a series of photothermal phase-change polyurethane materials which incorporates metal ions as coordination bonds was designed by polyethylene glycols of different molecular weights (6000, 8000, 10,000), diphenylmethane-4,4′-diisocyanate (MDI), zinc acetate, 1,5-naphthalenediol, p-benzoquinone dioxime, and triethanolamine (TEA). The photothermal phase-change polyurethane samples which synthesized with p-benzoquinone dioxime and 1,5-naphthalenediol as chain extenders, were named PUP-B (Li et al., 2024; Shi et al., 2021; Zhao et al., 2024 (6, 8, 10)) and PUP-N (Li et al., 2024; Shi et al., 2021; Zhao et al., 2024 (6, 8, 10)), respectively. To investigate their recyclability, these samples were dissolved and coated onto glass slides to obtain new polyurethane samples. After lighting for 420 s, the temperature of samples remained around 35–45 °C for approximately 5 min during cooling cycles, indicating excellent photothermal energy storage performance. The average maximum stress of PUP-B (10) and PUP-N (10) was 14.25 MPa and 11.96 MPa, respectively, while the average strain was 637 % and 486.44 %, demonstrating good tensile properties of the polyurethane material with PEG10K as the soft segments. The maximum water contact angle of the samples was 142.78°, indicating good hydrophobicity of the prepared samples. The recyclability, hydrophobicity, and photothermal energy storage capabilities of these materials make them suitable as green coating materials, providing new ideas for the development of aircraft anti-icing solutions.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109098"},"PeriodicalIF":6.5,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-08DOI: 10.1016/j.porgcoat.2025.109093
Kai Wang , Changliang Wang , Jianpeng Zhang , Xun Zou , Feng Rong , Long Xiang , Nannan Song , Xida Zhang , Qingwu Zhang , Zhongwei Chen , Tingting Chen , Yuan Yu , Juncheng Jiang
A novel flame retardant of epoxy resin (EP) containing P/N/B flame-retardant elements, DTA-B, was synthesized by introducing element B into the P/N flame-retardant system through a proton transfer reaction. DTA-B has a high residual carbon content of up to 55.8 wt% at 800 °C. The addition of 5 wt% DTA-B to EP significantly enhanced its flame retardancy, with the limiting oxygen index of the EP/5DTA-B composite increasing to 33.2 %, achieving the UL-94 V-0 rating. Cone calorimeter tests showed that, compared to pure EP, the peak heat release rate, total heat release, and total smoke production of EP/5DTA-B were reduced by 40.4 %, 20.7 %, and 27.4 %, respectively. Analysis of the pyrolysis behavior and char formation revealed the flame-retardant mechanism of DTA-B in both the gas and condensed phases. The flexural strength and tensile strength of EP/5DTA-B were 120.4 MPa and 62.3 MPa, respectively, which represent improvements of 18.7 % and 9.9 % compared to pure EP (101.4 MPa and 56.7 MPa). Furthermore, the introduction of DTA-B also improved the adhesive performance of EP, with the shear strength of EP/5DTA-B adhesive bonding steel and wooden bars being 14.38 MPa and 9.29 MPa, respectively, both higher than those of pure EP (7.23 MPa and 5.63 MPa). Compared to EP/5DTA and EP/5DOPO, EP/5DTA-B has the lowest phosphorus content but the best flame retardancy, reflecting the synergistic effect of the P/N/B flame-retardant elements. This study provides new insights into the introduction of element B into the P/N flame-retardant system and the development of DOPO-based flame retardants.
{"title":"Boron-nitrogen proton transfer reaction: Further exploration of DOPO-based flame retardants for enhanced flame resistance, mechanical properties, and adhesion in epoxy resins","authors":"Kai Wang , Changliang Wang , Jianpeng Zhang , Xun Zou , Feng Rong , Long Xiang , Nannan Song , Xida Zhang , Qingwu Zhang , Zhongwei Chen , Tingting Chen , Yuan Yu , Juncheng Jiang","doi":"10.1016/j.porgcoat.2025.109093","DOIUrl":"10.1016/j.porgcoat.2025.109093","url":null,"abstract":"<div><div>A novel flame retardant of epoxy resin (EP) containing P/N/B flame-retardant elements, DTA-B, was synthesized by introducing element B into the P/N flame-retardant system through a proton transfer reaction. DTA-B has a high residual carbon content of up to 55.8 wt% at 800 °C. The addition of 5 wt% DTA-B to EP significantly enhanced its flame retardancy, with the limiting oxygen index of the EP/5DTA-B composite increasing to 33.2 %, achieving the UL-94 V-0 rating. Cone calorimeter tests showed that, compared to pure EP, the peak heat release rate, total heat release, and total smoke production of EP/5DTA-B were reduced by 40.4 %, 20.7 %, and 27.4 %, respectively. Analysis of the pyrolysis behavior and char formation revealed the flame-retardant mechanism of DTA-B in both the gas and condensed phases. The flexural strength and tensile strength of EP/5DTA-B were 120.4 MPa and 62.3 MPa, respectively, which represent improvements of 18.7 % and 9.9 % compared to pure EP (101.4 MPa and 56.7 MPa). Furthermore, the introduction of DTA-B also improved the adhesive performance of EP, with the shear strength of EP/5DTA-B adhesive bonding steel and wooden bars being 14.38 MPa and 9.29 MPa, respectively, both higher than those of pure EP (7.23 MPa and 5.63 MPa). Compared to EP/5DTA and EP/5DOPO, EP/5DTA-B has the lowest phosphorus content but the best flame retardancy, reflecting the synergistic effect of the P/N/B flame-retardant elements. This study provides new insights into the introduction of element B into the P/N flame-retardant system and the development of DOPO-based flame retardants.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109093"},"PeriodicalIF":6.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143348824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-08DOI: 10.1016/j.porgcoat.2025.109115
M.A. Rezaei , R. Naderi , M. Mahdavian
This research involved the synthesis of a novel core/shell structure utilizing dopamine (DA) and modified carbon hollow spheres (CHSs) to control the release properties of DA/polydopamine (PDA) and assess its impact on the anti-corrosion characteristics of a mild steel (MS) substrate. The successful synthesis and loading of DA was confirmed by characterization techniques. The assessment of DA/PDA release from the nanocapsules CHS was carried out at different pHs using UV–vis (ultraviolet to visible) spectrophotometry. The effectiveness of the encapsulated DA/PDA within CHS (DA@CHS) for active corrosion protection was evaluated on both bare and epoxy-coated MS surfaces. The electrochemical impedance spectroscopy test conducted during the solution phase revealed that the exposed MS plates, immersed in a saline solution containing DA@CHS extract, exhibited a consistent rise in the total resistance, which was found to be around 2 times greater than that of the uninhibited sample. In the coating phase, findings demonstrated that the DA@CHS nanocomposite substantially improved the corrosion resistance properties of the MS substrate. Following a 72-h exposure in 3.5 % NaCl solution, the low-frequency impedance for the scratched epoxy coating including DA@CHS nanoparticles (DCEP) was found to be greater than that of the scratched epoxy coating including CHS nanoparticles (CEP) and the coating without nanoparticle (NEP). Moreover, DCEP coating demonstrated excellent pull-off strength in wet conditions (ca. 2.9 MPa) and lower adhesion loss compared to the NEP and the CEP coatings. Ultimately, the smart DCEP coating can be applied as a sustainable and effective anti-corrosion coating, distinguished by its exceptional self-healing and barrier capabilities.
{"title":"Dopamine-loaded carbon hollow spheres: A novel approach for enhanced active corrosion protection in polymer coatings","authors":"M.A. Rezaei , R. Naderi , M. Mahdavian","doi":"10.1016/j.porgcoat.2025.109115","DOIUrl":"10.1016/j.porgcoat.2025.109115","url":null,"abstract":"<div><div>This research involved the synthesis of a novel core/shell structure utilizing dopamine (DA) and modified carbon hollow spheres (CHSs) to control the release properties of DA/polydopamine (PDA) and assess its impact on the anti-corrosion characteristics of a mild steel (MS) substrate. The successful synthesis and loading of DA was confirmed by characterization techniques. The assessment of DA/PDA release from the nanocapsules CHS was carried out at different pHs using UV–vis (ultraviolet to visible) spectrophotometry. The effectiveness of the encapsulated DA/PDA within CHS (DA@CHS) for active corrosion protection was evaluated on both bare and epoxy-coated MS surfaces. The electrochemical impedance spectroscopy test conducted during the solution phase revealed that the exposed MS plates, immersed in a saline solution containing DA@CHS extract, exhibited a consistent rise in the total resistance, which was found to be around 2 times greater than that of the uninhibited sample. In the coating phase, findings demonstrated that the DA@CHS nanocomposite substantially improved the corrosion resistance properties of the MS substrate. Following a 72-h exposure in 3.5 % NaCl solution, the low-frequency impedance for the scratched epoxy coating including DA@CHS nanoparticles (DCEP) was found to be greater than that of the scratched epoxy coating including CHS nanoparticles (CEP) and the coating without nanoparticle (NEP). Moreover, DCEP coating demonstrated excellent pull-off strength in wet conditions (ca. 2.9 MPa) and lower adhesion loss compared to the NEP and the CEP coatings. Ultimately, the smart DCEP coating can be applied as a sustainable and effective anti-corrosion coating, distinguished by its exceptional self-healing and barrier capabilities.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":""},"PeriodicalIF":6.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-08DOI: 10.1016/j.porgcoat.2025.109108
Shiqian Qi , Hui Yan , Ao Tang , Ying Li
Silicone rubber encapsulation materials utilized in implantable electronic devices must withstand a complex biofluidic environment and incorporate a diverse array of inorganic and organic components. Nevertheless, the impact of proteins on the reliability of these encapsulation materials has not been extensively investigated. This study presents a thorough examination of the mechanisms through which proteins influence the performance of silicone rubber encapsulation materials. Initially, it was observed that bovine serum albumin (BSA) adsorbs in an elliptical particulate form, a process facilitated by the presence of peptide bonds (-CO-NH-) and α-helical structures, which are functional groups inherent to medical silicone rubber coatings. Additionally, the geometric dimensions of BSA are marginally larger than the microscopic pores of the coating, effectively obstructing water passage through the silicone rubber by blocking these pores. This blockage is crucial for enhancing the encapsulation properties of the coatings, as it significantly inhibits water transport. However, as the coating undergoes cracking, its encapsulation capacity is compromised, allowing for the diffusion of BSA to the T2 copper surface. At this juncture, BSA occupies the adsorption sites of the cathodic reactant O2, thereby effectively inhibiting the corrosion of the metal.
{"title":"Unveiling the effect of bovine serum albumin on the packaging performance of medical silicone rubber coating for implantable electronic devices","authors":"Shiqian Qi , Hui Yan , Ao Tang , Ying Li","doi":"10.1016/j.porgcoat.2025.109108","DOIUrl":"10.1016/j.porgcoat.2025.109108","url":null,"abstract":"<div><div>Silicone rubber encapsulation materials utilized in implantable electronic devices must withstand a complex biofluidic environment and incorporate a diverse array of inorganic and organic components. Nevertheless, the impact of proteins on the reliability of these encapsulation materials has not been extensively investigated. This study presents a thorough examination of the mechanisms through which proteins influence the performance of silicone rubber encapsulation materials. Initially, it was observed that bovine serum albumin (BSA) adsorbs in an elliptical particulate form, a process facilitated by the presence of peptide bonds (-CO-NH-) and α-helical structures, which are functional groups inherent to medical silicone rubber coatings. Additionally, the geometric dimensions of BSA are marginally larger than the microscopic pores of the coating, effectively obstructing water passage through the silicone rubber by blocking these pores. This blockage is crucial for enhancing the encapsulation properties of the coatings, as it significantly inhibits water transport. However, as the coating undergoes cracking, its encapsulation capacity is compromised, allowing for the diffusion of BSA to the T2 copper surface. At this juncture, BSA occupies the adsorption sites of the cathodic reactant O<sub>2</sub>, thereby effectively inhibiting the corrosion of the metal.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109108"},"PeriodicalIF":6.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-07DOI: 10.1016/j.porgcoat.2025.109129
Yue Wu, Yukai Wu, Shuting Zhang, Shusen Wei, Chen Jin, Yang Zhang, Hong Dong, Yanjiang Song, Zhirong Qu, Chuan Wu
Hexamethylcyclotrisiloxane was polymerized by non-equilibrium anion living polymerization initiated by lithium dimethylsilanol, and bridged with methyltrifluoropropyldichlorosilane to prepare methyltrifluoropropylsiloxy-bridged α, ω-dimethylsiloxy-terminated polydimethylsiloxane (DTFP), and then methyltrifluoropropylsiloxy-bridged α, ω-dimethylacryloxybutylsiloxy-terminated polydimethylsiloxane (DAFP) was prepared through hydroxyl protection, hydrosilylation, deprotection of trimethylsiloxyl groups and condensation reaction with acrylic acid. DAFP was mixed with α, ω-bis[dimethyl-[3-[2,2-bis(acryloyloxy)butoxy]propyl]silyl]-terminated PDMS oligomer (DBABP), a crosslinking density modifier, at a mass ratio of 70: 30, and then 2 parts of a photoinitiator consisting of 2-hydroxy-2-methyl-1-phenyl-1-propanone and diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide blended at a mass ratio of 1: 1 were added, and a cured film was prepared under UV light irradiation. The effects of initiator composition, UV irradiation time, and molecular weight of DAFP oligomers on the gelation yield, water absorption, water contact angle, thermal stability, and dielectric properties of the UV-cured products were investigated. These findings are significant as they contribute to the understanding of the synthesis and characteristics of new materials in the field of materials science and polymer chemistry. DAFP oligomers can be copolymerized with the DBABP oligomer within 25 s of UV irradiation. The sample (DAFP-2) with the best performance has a gelation yield of about 87 %, its T5% in nitrogen can reach 377.7 °C, its water absorption rate is as low as 0.85 %, and its surface water contact angle can reach 116°. Under 2 GHz conditions, the dielectric constant of the UV-cured PDMS film containing 2.61 % F element is 2.71, which is 9.1 % lower than that of the pure PDMS. Meanwhile, its dielectric loss is also significantly reduced.
{"title":"Preparation and properties of UV-curable silicone materials bridged by trifluoropropyl(methyl)siloxyl groups","authors":"Yue Wu, Yukai Wu, Shuting Zhang, Shusen Wei, Chen Jin, Yang Zhang, Hong Dong, Yanjiang Song, Zhirong Qu, Chuan Wu","doi":"10.1016/j.porgcoat.2025.109129","DOIUrl":"10.1016/j.porgcoat.2025.109129","url":null,"abstract":"<div><div>Hexamethylcyclotrisiloxane was polymerized by non-equilibrium anion living polymerization initiated by lithium dimethylsilanol, and bridged with methyltrifluoropropyldichlorosilane to prepare methyltrifluoropropylsiloxy-bridged α, ω-dimethylsiloxy-terminated polydimethylsiloxane (DTFP), and then methyltrifluoropropylsiloxy-bridged α, ω-dimethylacryloxybutylsiloxy-terminated polydimethylsiloxane (DAFP) was prepared through hydroxyl protection, hydrosilylation, deprotection of trimethylsiloxyl groups and condensation reaction with acrylic acid. DAFP was mixed with <em>α</em>, <em>ω</em>-bis[dimethyl-[3-[2,2-bis(acryloyloxy)butoxy]propyl]silyl]-terminated PDMS oligomer (DBABP), a crosslinking density modifier, at a mass ratio of 70: 30, and then 2 parts of a photoinitiator consisting of 2-hydroxy-2-methyl-1-phenyl-1-propanone and diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide blended at a mass ratio of 1: 1 were added, and a cured film was prepared under UV light irradiation. The effects of initiator composition, UV irradiation time, and molecular weight of DAFP oligomers on the gelation yield, water absorption, water contact angle, thermal stability, and dielectric properties of the UV-cured products were investigated. These findings are significant as they contribute to the understanding of the synthesis and characteristics of new materials in the field of materials science and polymer chemistry. DAFP oligomers can be copolymerized with the DBABP oligomer within 25 s of UV irradiation. The sample (DAFP-2) with the best performance has a gelation yield of about 87 %, its T5% in nitrogen can reach 377.7 °C, its water absorption rate is as low as 0.85 %, and its surface water contact angle can reach 116°. Under 2 GHz conditions, the dielectric constant of the UV-cured PDMS film containing 2.61 % F element is 2.71, which is 9.1 % lower than that of the pure PDMS. Meanwhile, its dielectric loss is also significantly reduced.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109129"},"PeriodicalIF":6.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-07DOI: 10.1016/j.porgcoat.2025.109110
Li Chen , Fan-di Meng , Fu-hui Wang , Li Liu
Organic coatings are one of the most widely used methods for metal protection. However, traditional organic coatings fail to meet the demands for mechanical energy relief under harsh marine conditions characterized by fluid shear and pressure. To address this challenge, a biomimetic strategy is proposed to introduce a slipable functional side chain into the epoxy backbone, mimicking the mechanism of tentacle movement in sea anemones. This innovative design endows the 2-ureido-4-pyrimidone (UPy)-grafted epoxy coating with exceptional mechanical energy dissipation capabilities. An in-depth investigation into the relationship between the molecular structure and properties revealed that the enhancement originates from a unique architecture that mimics the slip mechanism of sea anemones. This structure features chain-sliding motion at the molecular level and the dynamic exchange of hydrogen bond cross-linking sites. This mechanism efficiently dissipates mechanical energy within the three-dimensional crosslinked network of the coating, thereby significantly enhancing its anti-corrosion performance. This research offers a novel strategy for developing mechanical energy relief coatings and shows promise for the practical application of dynamic bond chemistry theory in creating multifunctional coatings for deep-sea equipment.
{"title":"Sea anemone-inspired smart epoxy coating with mechanical energy relieving capability for improved corrosion protection in simulated marine environment","authors":"Li Chen , Fan-di Meng , Fu-hui Wang , Li Liu","doi":"10.1016/j.porgcoat.2025.109110","DOIUrl":"10.1016/j.porgcoat.2025.109110","url":null,"abstract":"<div><div>Organic coatings are one of the most widely used methods for metal protection. However, traditional organic coatings fail to meet the demands for mechanical energy relief under harsh marine conditions characterized by fluid shear and pressure. To address this challenge, a biomimetic strategy is proposed to introduce a slipable functional side chain into the epoxy backbone, mimicking the mechanism of tentacle movement in sea anemones. This innovative design endows the 2-ureido-4-pyrimidone (UPy)-grafted epoxy coating with exceptional mechanical energy dissipation capabilities. An in-depth investigation into the relationship between the molecular structure and properties revealed that the enhancement originates from a unique architecture that mimics the slip mechanism of sea anemones. This structure features chain-sliding motion at the molecular level and the dynamic exchange of hydrogen bond cross-linking sites. This mechanism efficiently dissipates mechanical energy within the three-dimensional crosslinked network of the coating, thereby significantly enhancing its anti-corrosion performance. This research offers a novel strategy for developing mechanical energy relief coatings and shows promise for the practical application of dynamic bond chemistry theory in creating multifunctional coatings for deep-sea equipment.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"201 ","pages":"Article 109110"},"PeriodicalIF":6.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143359299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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