Pub Date : 2025-01-17DOI: 10.1016/j.porgcoat.2025.109072
Yu Li , Hao-Xin Niu , Ze-Tao Xiao , Tian-Mo Yang , Hao-Ran Jiang , Wei Wang , Yuan Hu , Xin Wang
High-transparent polycarbonate (PC) is often used to replace glass in construction, but its poor flame retardancy limits its use. In recent years, materials for covalent adaptive networks (CANs) have gained much attention. The preparation of CANs and their application to flame retardant coatings is an innovative approach. In this work, a dithiol-containing borate ester (B2SH) and P-containing eugenol monomer (TEP) were synthesized. The flame retardant self-healing eugenol bio-based covalent adaptive network (TEP-SH) was prepared by copolymerizing TEP with B2SH and polythiol monomers (such as pentaerythritol tetra(3-mercaptopropionate) (4SH)) via photo-induced thiol-ene polymerization. Among these samples, TEP/B2SH/13%4SH has the best comprehensive performance, while superior flame retardancy, self-healing and shape memory properties and high transparency are preserved. TEP/B2SH/13%4SH was coated on a PC board for the cone calorimeter test. Compared with those of PC, PHRR and THR decreased by 31.3% and 24.5%, respectively, and the char yield (CY) increased from 3.5% to 16.6%. Moreover, TEP/B2SH/13%4SH exhibited excellent adhesion to PC with a high shear strength (2.77 MPa). Therefore, TEP/B2SH/13%4SH has excellent performance and can be used as a flame-retardant, transparent and self-healing coating, thus ensuring the safe application of PC in building materials.
{"title":"Sustainably sourced covalent adaptable networks derived from eugenol for flame retardant, transparent and self-healing coating applications","authors":"Yu Li , Hao-Xin Niu , Ze-Tao Xiao , Tian-Mo Yang , Hao-Ran Jiang , Wei Wang , Yuan Hu , Xin Wang","doi":"10.1016/j.porgcoat.2025.109072","DOIUrl":"10.1016/j.porgcoat.2025.109072","url":null,"abstract":"<div><div>High-transparent polycarbonate (PC) is often used to replace glass in construction, but its poor flame retardancy limits its use. In recent years, materials for covalent adaptive networks (CANs) have gained much attention. The preparation of CANs and their application to flame retardant coatings is an innovative approach. In this work, a dithiol-containing borate ester (B2SH) and P-containing eugenol monomer (TEP) were synthesized. The flame retardant self-healing eugenol bio-based covalent adaptive network (TEP-SH) was prepared by copolymerizing TEP with B2SH and polythiol monomers (such as pentaerythritol tetra(3-mercaptopropionate) (4SH)) via photo-induced thiol-ene polymerization. Among these samples, TEP/B2SH/13%4SH has the best comprehensive performance, while superior flame retardancy, self-healing and shape memory properties and high transparency are preserved. TEP/B2SH/13%4SH was coated on a PC board for the cone calorimeter test. Compared with those of PC, PHRR and THR decreased by 31.3% and 24.5%, respectively, and the char yield (CY) increased from 3.5% to 16.6%. Moreover, TEP/B2SH/13%4SH exhibited excellent adhesion to PC with a high shear strength (2.77 MPa). Therefore, TEP/B2SH/13%4SH has excellent performance and can be used as a flame-retardant, transparent and self-healing coating, thus ensuring the safe application of PC in building materials.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109072"},"PeriodicalIF":6.5,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163581","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 : 2025-01-17DOI: 10.1016/j.porgcoat.2025.109064
Xinrong Huang, Gang Wang, Yi Zhang, Zhengxiang Zhou, Yingfeng Yu
Constructing fit-for-purpose overall properties in optically clear pressure sensitive adhesives (OCAs) is a prerequisite for achieving high-quality displays and remains challenging. Herein, we report a series of OCAs based on UV-curable polyurethane acrylate (PUA) copolymers with varied diisocyanates and average acrylate functionalities in the PUA prepolymer to unveil the impact of microphase structure on the overall properties of OCAs. Both simulation and experimental results suggest that OCAs based on diisocyanates with higher symmetry and rigidity show stronger hard-phase interaction, which further enhances adhesion. While OCAs based on alicyclic diisocyanates exhibit better optical properties than those based on aromatic diisocyanates, which can attribute to the lower refractive index of alicyclic hard phase. An increase of average acrylate functionality reduces the hard segment stacking near the crosslinking point and promoting phase mixing, which is confirmed by SAXS and FTIR experiments. However, the haze value of the related OCA is abnormally increased. It is tentatively inferred that chemical crosslinking has an opposite effect: it decreases the degree of microphase separation (which decreases haze value) yet amplifies scattering resulting from refractive index mismatch of the microphase (which increases haze value). This work provides design insights for balancing the overall performance of OCAs and further enabling high-quality displays.
{"title":"Controlled microphase separation in polyurethane acrylate-based optically clear pressure sensitive adhesives","authors":"Xinrong Huang, Gang Wang, Yi Zhang, Zhengxiang Zhou, Yingfeng Yu","doi":"10.1016/j.porgcoat.2025.109064","DOIUrl":"10.1016/j.porgcoat.2025.109064","url":null,"abstract":"<div><div>Constructing fit-for-purpose overall properties in optically clear pressure sensitive adhesives (OCAs) is a prerequisite for achieving high-quality displays and remains challenging. Herein, we report a series of OCAs based on UV-curable polyurethane acrylate (PUA) copolymers with varied diisocyanates and average acrylate functionalities in the PUA prepolymer to unveil the impact of microphase structure on the overall properties of OCAs. Both simulation and experimental results suggest that OCAs based on diisocyanates with higher symmetry and rigidity show stronger hard-phase interaction, which further enhances adhesion. While OCAs based on alicyclic diisocyanates exhibit better optical properties than those based on aromatic diisocyanates, which can attribute to the lower refractive index of alicyclic hard phase. An increase of average acrylate functionality reduces the hard segment stacking near the crosslinking point and promoting phase mixing, which is confirmed by SAXS and FTIR experiments. However, the haze value of the related OCA is abnormally increased. It is tentatively inferred that chemical crosslinking has an opposite effect: it decreases the degree of microphase separation (which decreases haze value) yet amplifies scattering resulting from refractive index mismatch of the microphase (which increases haze value). This work provides design insights for balancing the overall performance of OCAs and further enabling high-quality displays.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109064"},"PeriodicalIF":6.5,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163695","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 : 2025-01-16DOI: 10.1016/j.porgcoat.2025.109074
Chunlin Chen , Xinyu Bai , Guoqing Xiao , Fei Zhong , Ruili Li , Hao Li , Chunyan Chen , Chuanlin Mou , Bin Wang
Alginate fibers (ORF), as an organic fiber, have the natural advantage of good compatibility with epoxy resins. However, it is unable to adequately serve as a reinforcing residual char at high temperature due to its greater tendency to form amorphous char. To address this shortcoming, Co, Zn-MOF was uniformly immobilized on the surface of ORF, which accelerated the transformation of resin matrices to stabilized carbonaceous materials. Simultaneously, the Co, Zn-MOF could induce the conversion of the ORF into residual carbon and retain its fiber structure, thus serving the purpose of reinforcing the residual carbon. After that, the organosilicon was loaded on the surface of ORF/Co,Zn-MOF to obtain ORF/Co,Zn-MOF@Si composite flame retardant, which could form a stable silicon network at high temperature, thus effectively slowing down the heat transfer process. The experimental results proved that the ORF@Co,Zn-MOF@Si filled EP exhibited maximum tensile strength (12.2 ± 0.51 Mpa) and impact strength (18.3 ± 0.56 KJ/m2). Further, the ORF@Co,Zn-MOF@Si/EP composite coating had a significantly lower backside temperature (166.4 °C) than other coatings, signaling optimum thermal insulation efficiency. It is worth mentioning that the ORF@Co,Zn-MOF@Si/EP samples achieved a significant residual carbon retention rate (31.9 %) in the heat loss assessment session, which is attributed to the catalytic effect of Co and Zn ions on carbon generation within the Co,Zn-MOF framework. The expansion height and expansion rate of the ORF@Co,Zn-MOF@Si/EP sample were 19.60 mm and 15.2, highlighting a significant enhancement in foaming behavior. Besides, some fibrous structures can be clearly observed in the carbon layer of ORF@Co,Zn-MOF@Si/EP, which can be explained by the catalytic carbon-forming effect of Co,Zn-MOF and the protective effect of silicon network.
{"title":"Improvement of fire protection properties of epoxy coatings with cobalt-zinc based metal-organic frameworks and siloxane co-loaded alginate fibers as nano-reinforcing agents","authors":"Chunlin Chen , Xinyu Bai , Guoqing Xiao , Fei Zhong , Ruili Li , Hao Li , Chunyan Chen , Chuanlin Mou , Bin Wang","doi":"10.1016/j.porgcoat.2025.109074","DOIUrl":"10.1016/j.porgcoat.2025.109074","url":null,"abstract":"<div><div>Alginate fibers (ORF), as an organic fiber, have the natural advantage of good compatibility with epoxy resins. However, it is unable to adequately serve as a reinforcing residual char at high temperature due to its greater tendency to form amorphous char. To address this shortcoming, Co, Zn-MOF was uniformly immobilized on the surface of ORF, which accelerated the transformation of resin matrices to stabilized carbonaceous materials. Simultaneously, the Co, Zn-MOF could induce the conversion of the ORF into residual carbon and retain its fiber structure, thus serving the purpose of reinforcing the residual carbon. After that, the organosilicon was loaded on the surface of ORF/Co,Zn-MOF to obtain ORF/Co,Zn-MOF@Si composite flame retardant, which could form a stable silicon network at high temperature, thus effectively slowing down the heat transfer process. The experimental results proved that the ORF@Co,Zn-MOF@Si filled EP exhibited maximum tensile strength (12.2 ± 0.51 Mpa) and impact strength (18.3 ± 0.56 KJ/m<sup>2</sup>). Further, the ORF@Co,Zn-MOF@Si/EP composite coating had a significantly lower backside temperature (166.4 °C) than other coatings, signaling optimum thermal insulation efficiency. It is worth mentioning that the ORF@Co,Zn-MOF@Si/EP samples achieved a significant residual carbon retention rate (31.9 %) in the heat loss assessment session, which is attributed to the catalytic effect of Co and Zn ions on carbon generation within the Co,Zn-MOF framework. The expansion height and expansion rate of the ORF@Co,Zn-MOF@Si/EP sample were 19.60 mm and 15.2, highlighting a significant enhancement in foaming behavior. Besides, some fibrous structures can be clearly observed in the carbon layer of ORF@Co,Zn-MOF@Si/EP, which can be explained by the catalytic carbon-forming effect of Co,Zn-MOF and the protective effect of silicon network.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109074"},"PeriodicalIF":6.5,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163578","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 : 2025-01-16DOI: 10.1016/j.porgcoat.2025.109068
Yajun Deng , Changan Zhang , Shibin Wang , Hui Li , Chuanying Wei , Daqing Fang , Zhangji Ye , Jianhua Wu
In this work, two distinct nano-fillers (HBP), designated as HBP1 and HBP2, were synthesized through the chemical grafting poly(ethyleneimine) (PEI) with two varying molecular weights onto the halloysite nanotubes (HNTs) surface, thereby imparting pH-responsive switching capabilities to the smart films. Subsequently, these different fillers were loaded with benzotriazole (BTA) utilizing a vacuum impregnation technique. Besides, GP-HBP1 and GP-HBP2 nano-fillers were prepared by co-doping polypyrrole (PPy) and HBP onto the graphene oxide (GO) surface. The structural configurations of the four fillers were meticulously characterized, and the pH-responsive behaviors of HBP1 and HBP2 were comprehensively investigated. Specifically, the corrosion inhibition efficacy of each filler, as well as the corrosion resistance of the composite epoxy resin, were rigorously evaluated to determine their ultimate anticorrosion performance. The GP-HBP2-incorporated composite coating exhibited superior barrier properties, and its exceptional anticorrosion performance could be attributed to the loading content and release mechanism of BTA within the nanotubes and on the graphene surface. Additionally, this layer remained chemically inert, thereby mitigating galvanic corrosion. Consequently, our research may open new avenues for developing advanced materials that offer long-term corrosion protection.
{"title":"pH-drive responsive and controlled release system of smart nanocontainers for corrosion protection of epoxy resin","authors":"Yajun Deng , Changan Zhang , Shibin Wang , Hui Li , Chuanying Wei , Daqing Fang , Zhangji Ye , Jianhua Wu","doi":"10.1016/j.porgcoat.2025.109068","DOIUrl":"10.1016/j.porgcoat.2025.109068","url":null,"abstract":"<div><div>In this work, two distinct nano-fillers (HBP), designated as HBP<sub>1</sub> and HBP<sub>2</sub>, were synthesized through the chemical grafting poly(ethyleneimine) (PEI) with two varying molecular weights onto the halloysite nanotubes (HNTs) surface, thereby imparting pH-responsive switching capabilities to the smart films. Subsequently, these different fillers were loaded with benzotriazole (BTA) utilizing a vacuum impregnation technique. Besides, GP-HBP<sub>1</sub> and GP-HBP<sub>2</sub> nano-fillers were prepared by <em>co</em>-doping polypyrrole (PPy) and HBP onto the graphene oxide (GO) surface. The structural configurations of the four fillers were meticulously characterized, and the pH-responsive behaviors of HBP<sub>1</sub> and HBP<sub>2</sub> were comprehensively investigated. Specifically, the corrosion inhibition efficacy of each filler, as well as the corrosion resistance of the composite epoxy resin, were rigorously evaluated to determine their ultimate anticorrosion performance. The GP-HBP<sub>2</sub>-incorporated composite coating exhibited superior barrier properties, and its exceptional anticorrosion performance could be attributed to the loading content and release mechanism of BTA within the nanotubes and on the graphene surface. Additionally, this layer remained chemically inert, thereby mitigating galvanic corrosion. Consequently, our research may open new avenues for developing advanced materials that offer long-term corrosion protection.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109068"},"PeriodicalIF":6.5,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163694","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 : 2025-01-16DOI: 10.1016/j.porgcoat.2025.109060
Yifeng Lei , Tingting Shang , Yefeng Qiu , Yanfei Shi , Shaopeng Fu , Mingzhe Li , Siqian Qu , Chengxiao Huang , Jianfeng Li
Studying interfacial engineering is crucial to developing organic solar cells (OSCs). Herein, we report a novel, alcohol-soluble, self-doped small molecule, 3,3′-(indolo[3,2-b]indole-5,10-diyl)bis(N,N-dimethylpropan-1-amine) (IDID1), which features a backbone composed of two linked indole units and two nitrogen-containing carbon chains as side chains. The nitrogen-containing side chains impart a polarity, making it soluble in polar solvents such as methanol, thereby enhancing its environmental compatibility. Notably, IDID1 forms an interfacial dipole layer, which effectively reduces the work function (WF) of the Al electrode. Furthermore, an n-type self-doping effect is observed in IDID1, which is attributed to the transfer of the lone pair of electrons present on the nitrogen atoms to the central conjugated unit. The self-doping effect has been empirically demonstrated to significantly enhance the electron collection efficiency and transport capacity, thereby ultimately resulting in an increased electron mobility. In the present study, orthotropic devices were fabricated utilizing IDID1 as the cathode interfacial layers (CILs). The optimal performance of the devices was achieved at a IDID1 concentration of 0.6 mg·mL−1, with a power conversion efficiency (PCE) of 8.88 %. This represents a 175 % improvement in performance compared to devices without CILs.
{"title":"Self-doped alcohol-soluble small molecules as cathode interface layers for organic solar cells","authors":"Yifeng Lei , Tingting Shang , Yefeng Qiu , Yanfei Shi , Shaopeng Fu , Mingzhe Li , Siqian Qu , Chengxiao Huang , Jianfeng Li","doi":"10.1016/j.porgcoat.2025.109060","DOIUrl":"10.1016/j.porgcoat.2025.109060","url":null,"abstract":"<div><div>Studying interfacial engineering is crucial to developing organic solar cells (OSCs). Herein, we report a novel, alcohol-soluble, self-doped small molecule, 3,3′-(indolo[3,2-<em>b</em>]indole-5,10-diyl)bis(<em>N</em>,<em>N</em>-dimethylpropan-1-amine) (IDID1), which features a backbone composed of two linked indole units and two nitrogen-containing carbon chains as side chains. The nitrogen-containing side chains impart a polarity, making it soluble in polar solvents such as methanol, thereby enhancing its environmental compatibility. Notably, IDID1 forms an interfacial dipole layer, which effectively reduces the work function (WF) of the Al electrode. Furthermore, an n-type self-doping effect is observed in IDID1, which is attributed to the transfer of the lone pair of electrons present on the nitrogen atoms to the central conjugated unit. The self-doping effect has been empirically demonstrated to significantly enhance the electron collection efficiency and transport capacity, thereby ultimately resulting in an increased electron mobility. In the present study, orthotropic devices were fabricated utilizing IDID1 as the cathode interfacial layers (CILs). The optimal performance of the devices was achieved at a IDID1 concentration of 0.6 mg·mL<sup>−1</sup>, with a power conversion efficiency (PCE) of 8.88 %. This represents a 175 % improvement in performance compared to devices without CILs.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109060"},"PeriodicalIF":6.5,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163693","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}
Graphitic carbon nitride (GCN) nanosheets have the potential to serve as effective fillers for epoxy (EP) matrices, enhancing the barrier properties against the penetration of corrosive ions. This study investigates the impact of various GCNs including bulk GCN obtained through thermal treatment of urea, large-sized nanosheets (LG) synthesized via ultrasound treatment, medium-sized nanosheets (MG) fabricated by NH4OH and ultrasound treatments, and GCN quantum dots (QDs) formed through acid treatment followed by NH4OH and ultrasound treatments on A36 steel substrates. Among these, EP modified with QD demonstrates proper anticorrosion performance in 3.5 % NaCl solution, maintaining stability from the initial application to 672 h of immersion. The corrosion current density of the QD sample decreased by two orders of magnitude compared to the bulk sample, and after 672 h of immersion, it showed excellent stability with only a slight increase. Corrosion resistance was assessed in both light (L) and dark (D) environments with the QD sample displaying the best corrosion resistance according to the extent of reduction in corrosion current density: (GCN (L) icorr = 1.42 × 10−5 A/cm2, QD (L) icorr = 2.03 × 10−7 A/cm2; GCN (D) icorr = 8.66 × 10−6 A/cm2, QD (D) icorr = 2.03 × 10−7 A/cm2). This might be attributed to an increase to the number of NH2 terminal groups and the oxygen defects due to the acid treatment of bulk g-C3N4. Moreover, the wide bandgap of the GCN in the form of QD further boosts the coating's corrosion resistance in the presence of light.
{"title":"Assessment of anticorrosion performance of epoxy coatings through controlling graphitic carbon nitride nanosheet bandgap and morphology","authors":"Roozbeh Azinfar , Abdollah Omrani , Shahram Ghasemi","doi":"10.1016/j.porgcoat.2025.109059","DOIUrl":"10.1016/j.porgcoat.2025.109059","url":null,"abstract":"<div><div>Graphitic carbon nitride (GCN) nanosheets have the potential to serve as effective fillers for epoxy (EP) matrices, enhancing the barrier properties against the penetration of corrosive ions. This study investigates the impact of various GCNs including bulk GCN obtained through thermal treatment of urea, large-sized nanosheets (LG) synthesized via ultrasound treatment, medium-sized nanosheets (MG) fabricated by NH<sub>4</sub>OH and ultrasound treatments, and GCN quantum dots (QDs) formed through acid treatment followed by NH<sub>4</sub>OH and ultrasound treatments on A36 steel substrates. Among these, EP modified with QD demonstrates proper anticorrosion performance in 3.5 % NaCl solution, maintaining stability from the initial application to 672 h of immersion. The corrosion current density of the QD sample decreased by two orders of magnitude compared to the bulk sample, and after 672 h of immersion, it showed excellent stability with only a slight increase. Corrosion resistance was assessed in both light (L) and dark (D) environments with the QD sample displaying the best corrosion resistance according to the extent of reduction in corrosion current density: (GCN (L) i<sub>corr</sub> = 1.42 × 10<sup>−5</sup> A/cm<sup>2</sup>, QD (L) i<sub>corr</sub> = 2.03 × 10<sup>−7</sup> A/cm<sup>2</sup>; GCN (D) i<sub>corr</sub> = 8.66 × 10<sup>−6</sup> A/cm<sup>2</sup>, QD (D) i<sub>corr</sub> = 2.03 × 10<sup>−7</sup> A/cm<sup>2</sup>). This might be attributed to an increase to the number of NH<sub>2</sub> terminal groups and the oxygen defects due to the acid treatment of bulk g-C<sub>3</sub>N<sub>4</sub>. Moreover, the wide bandgap of the GCN in the form of QD further boosts the coating's corrosion resistance in the presence of light.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109059"},"PeriodicalIF":6.5,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163577","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 : 2025-01-16DOI: 10.1016/j.porgcoat.2025.109061
Victor Marvin Luna , Si-Yun Song , Young-Soo Jeong , Sang-Hyung Lee , In-Tae Kim
This paper proposes an estimation method for the lifetime of coating systems for bridges in corrosive environments described by the ISO 9223 categories. Accelerated corrosion tests were conducted to simulate ISO 11997-1 Cycle D by subjecting the specimens to cycles of salt mist exposure, condensation, and evaporation. Circular defects with diameters of 1, 3, and 5 mm were introduced to the coatings as initial deterioration to match the ASTM D610 rust patterns for 0.03 %, 0.1 %, 0.3 %, 1 %, and 3 % coverage as rusted areas of the coating. The collected data suggest a logistic growth curve model for the deterioration rate. Durability curves (R2 > 0.98) were developed to estimate the lifetimes of the coatings in ISO 9223 corrosive environments. Thus, this study presents a method for predicting the remaining life until repainting is required for deteriorated sections of the coatings. These models improve maintenance planning and aid in prolonging the effective service lives of coated steel bridges.
{"title":"Predictive approach to assessing the lifetimes of heavy-duty coating systems for steel bridges","authors":"Victor Marvin Luna , Si-Yun Song , Young-Soo Jeong , Sang-Hyung Lee , In-Tae Kim","doi":"10.1016/j.porgcoat.2025.109061","DOIUrl":"10.1016/j.porgcoat.2025.109061","url":null,"abstract":"<div><div>This paper proposes an estimation method for the lifetime of coating systems for bridges in corrosive environments described by the ISO 9223 categories. Accelerated corrosion tests were conducted to simulate ISO 11997-1 Cycle D by subjecting the specimens to cycles of salt mist exposure, condensation, and evaporation. Circular defects with diameters of 1, 3, and 5 mm were introduced to the coatings as initial deterioration to match the ASTM D610 rust patterns for 0.03 %, 0.1 %, 0.3 %, 1 %, and 3 % coverage as rusted areas of the coating. The collected data suggest a logistic growth curve model for the deterioration rate. Durability curves (R<sup>2</sup> > 0.98) were developed to estimate the lifetimes of the coatings in ISO 9223 corrosive environments. Thus, this study presents a method for predicting the remaining life until repainting is required for deteriorated sections of the coatings. These models improve maintenance planning and aid in prolonging the effective service lives of coated steel bridges.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109061"},"PeriodicalIF":6.5,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163692","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 : 2025-01-14DOI: 10.1016/j.porgcoat.2025.109071
Junjie Tan, Fan Li, Hongxiang Chen, Hongye Yan, Yu Zhou
In order to improve mechanical properties and water resistance of waterborne polyurethane and then meet the application requirements of automotive middle coating, a series of polycarbonate-based waterborne polyurethane (WPCU) with high solid content were prepared by using polycarbonate diol (PCDL), isophorone diisocyanate (IPDI), 2,2-dihydroxymethylpropionic acid (DMPA) and ethylenediamine (EDA) as materials. The effects of PCDL molecular weight and -NCO/-OH molar ratio (R) on the structure and tensile properties of WPCU were studied. When the molecular weight of PCDL was 2000 g/mol and the R value was 1.7, the obtained WPCU had higher tensile strength, because its higher degree of hydrogen bonding between hard segments was more beneficial to the microphase separation of soft and hard segments. Subsequently, using amino resin as external crosslinking agent, the thermal curing conditions and the effect of the amino resin amount on structure and properties of amine resin-crosslinked waterborne polyurethane (AWPCU) were researched. The results showed that the introduction of amino resin could make AWPCU form a three-dimensional cross-networking structure and that the hydrogen bonding interaction between hard segments was further enhanced. When the amino resin content was 18 wt%, the obtained AWPCU-18 had more excellent mechanical properties and water resistance. Meanwhile, AWPCU-18 had good adhesive properties and chemical corrosion resistance. Therefore, AWPCU would have great application potential in the field of automotive middle coating.
{"title":"Amine resin-crosslinked waterborne polyurethane with excellent mechanical properties and water resistance for automotive middle coating","authors":"Junjie Tan, Fan Li, Hongxiang Chen, Hongye Yan, Yu Zhou","doi":"10.1016/j.porgcoat.2025.109071","DOIUrl":"10.1016/j.porgcoat.2025.109071","url":null,"abstract":"<div><div>In order to improve mechanical properties and water resistance of waterborne polyurethane and then meet the application requirements of automotive middle coating, a series of polycarbonate-based waterborne polyurethane (WPCU) with high solid content were prepared by using polycarbonate diol (PCDL), isophorone diisocyanate (IPDI), 2,2-dihydroxymethylpropionic acid (DMPA) and ethylenediamine (EDA) as materials. The effects of PCDL molecular weight and -NCO/-OH molar ratio (R) on the structure and tensile properties of WPCU were studied. When the molecular weight of PCDL was 2000 g/mol and the R value was 1.7, the obtained WPCU had higher tensile strength, because its higher degree of hydrogen bonding between hard segments was more beneficial to the microphase separation of soft and hard segments. Subsequently, using amino resin as external crosslinking agent, the thermal curing conditions and the effect of the amino resin amount on structure and properties of amine resin-crosslinked waterborne polyurethane (AWPCU) were researched. The results showed that the introduction of amino resin could make AWPCU form a three-dimensional cross-networking structure and that the hydrogen bonding interaction between hard segments was further enhanced. When the amino resin content was 18 wt%, the obtained AWPCU-18 had more excellent mechanical properties and water resistance. Meanwhile, AWPCU-18 had good adhesive properties and chemical corrosion resistance. Therefore, AWPCU would have great application potential in the field of automotive middle coating.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109071"},"PeriodicalIF":6.5,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163690","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 : 2025-01-13DOI: 10.1016/j.porgcoat.2025.109065
Sihao Bi , Tong Zhao , Jinghui Tuo , Xiaolong Wang , Ying Sun , Yuantao Zhang
Polyimide (PI) has been widely utilized as an insulating coating material in electrical and electronic packaging applications. Doping fluorinated graphene (FG) into PI can result in a composite insulating coating that combines a high thermal conductivity with a low dielectric constant. To explore the mechanism of the physical property evolution under extreme conditions such as high temperatures, intense electric fields, oxygen-rich, and high-humidity environments, PI neat and PI/FG composite systems were constructed, and molecular dynamics simulations were conducted under the reactive force field (ReaxFF). The results demonstrated that compared with the PI neat system, doping FG into the PI/FG composite significantly increased the thermal conductivity and free volume fraction by 164.7 % and 18.4 %, respectively. Furthermore, FG effectively mitigated the degradation of PI molecules under high temperatures and intense electric fields, reducing the generation of small-molecule degradation products such as CO, CO2, H2O, and H3N. Additionally, FG doping reduced the binding energy with O2 and H2O onto PI molecules, thereby preventing erosion of PI by these species. Finally, a comparative analysis with other studies revealed excellent agreement between the experiments and simulations. This study provides valuable theoretical insights for designing insulating coating materials with enhanced durability and reliability.
{"title":"Physical evolution mechanism of polyimide/fluorinated graphene composite insulating materials under extreme conditions","authors":"Sihao Bi , Tong Zhao , Jinghui Tuo , Xiaolong Wang , Ying Sun , Yuantao Zhang","doi":"10.1016/j.porgcoat.2025.109065","DOIUrl":"10.1016/j.porgcoat.2025.109065","url":null,"abstract":"<div><div>Polyimide (PI) has been widely utilized as an insulating coating material in electrical and electronic packaging applications. Doping fluorinated graphene (FG) into PI can result in a composite insulating coating that combines a high thermal conductivity with a low dielectric constant. To explore the mechanism of the physical property evolution under extreme conditions such as high temperatures, intense electric fields, oxygen-rich, and high-humidity environments, PI neat and PI/FG composite systems were constructed, and molecular dynamics simulations were conducted under the reactive force field (ReaxFF). The results demonstrated that compared with the PI neat system, doping FG into the PI/FG composite significantly increased the thermal conductivity and free volume fraction by 164.7 % and 18.4 %, respectively. Furthermore, FG effectively mitigated the degradation of PI molecules under high temperatures and intense electric fields, reducing the generation of small-molecule degradation products such as CO, CO<sub>2</sub>, H<sub>2</sub>O, and H<sub>3</sub>N. Additionally, FG doping reduced the binding energy with O<sub>2</sub> and H<sub>2</sub>O onto PI molecules, thereby preventing erosion of PI by these species. Finally, a comparative analysis with other studies revealed excellent agreement between the experiments and simulations. This study provides valuable theoretical insights for designing insulating coating materials with enhanced durability and reliability.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109065"},"PeriodicalIF":6.5,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163689","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 : 2025-01-13DOI: 10.1016/j.porgcoat.2025.109055
Jing Cheng , Zhenghao Li , Yanqiang Lei , Lingqi Zeng , Yuhang Dai , Wei Luo , Zhibo Duan , Qijun Sun , Hui Yang , Xiangde Lin
Creating superhydrophobic interfaces on Mg alloys has been regarded a promising strategy to significantly enhance corrosion resistance for practical applications. However, the abilities to withstand external damages and strengthen anticorrosion have been pursued for a long time. Herein, a novel technique has been proposed for obtaining robust superhydrophobic AZ31B Mg alloys by integrating hydrothermal processing with tannic acid (TA)-(3-aminopropyl) triethoxysilane (APTES)/polydimethylsiloxane (PDMS) coatings for synergistically-enhanced corrosion protection (abbreviated as MgHT/TA-APTES/PDMS). First, hierarchical structures for the superhydrophobic interfaces are successfully constructed by hydrothermal processing and TA-APTES nanocomplex formation through hydrolysis, oxidation, Michael addition, and Schiff base reactions; PDMS coating is then modified and optimized with a water contact angle of 165.4° and a sliding angle of 3.4° to achieve water-repellent and self-cleaning properties. Second, chemical and physical durability and robustness of the superhydrophobic coating could be consistently maintained in chemical corrosive environments (examined by water flow impact, natural exposure, sandpaper abrasion, and water jet treatments). Third, it is remarkable that that the corrosion current density of MgHT/TA-APTES/PDMS reached a record low level of 9.931 × 10−11 A/cm2 at a high corrosion potential of 0.014 V. This work demonstrates a huge breakthrough for the electrochemical performances of the modified Mg alloys, which provides an efficient strategy to significantly improving its corrosion resistance and extending its applications in implanted electronics, biomedicine, interventional therapy for cardiovascular diseases, etc.
{"title":"Robust superhydrophobic mg alloys integrating hydrothermal processing with TA-APTES/PDMS coatings for synergistically enhanced corrosion protection","authors":"Jing Cheng , Zhenghao Li , Yanqiang Lei , Lingqi Zeng , Yuhang Dai , Wei Luo , Zhibo Duan , Qijun Sun , Hui Yang , Xiangde Lin","doi":"10.1016/j.porgcoat.2025.109055","DOIUrl":"10.1016/j.porgcoat.2025.109055","url":null,"abstract":"<div><div>Creating superhydrophobic interfaces on Mg alloys has been regarded a promising strategy to significantly enhance corrosion resistance for practical applications. However, the abilities to withstand external damages and strengthen anticorrosion have been pursued for a long time. Herein, a novel technique has been proposed for obtaining robust superhydrophobic AZ31B Mg alloys by integrating hydrothermal processing with tannic acid (TA)-(3-aminopropyl) triethoxysilane (APTES)/polydimethylsiloxane (PDMS) coatings for synergistically-enhanced corrosion protection (abbreviated as Mg<sub>HT</sub>/TA-APTES/PDMS). First, hierarchical structures for the superhydrophobic interfaces are successfully constructed by hydrothermal processing and TA-APTES nanocomplex formation through hydrolysis, oxidation, Michael addition, and Schiff base reactions; PDMS coating is then modified and optimized with a water contact angle of 165.4° and a sliding angle of 3.4° to achieve water-repellent and self-cleaning properties. Second, chemical and physical durability and robustness of the superhydrophobic coating could be consistently maintained in chemical corrosive environments (examined by water flow impact, natural exposure, sandpaper abrasion, and water jet treatments). Third, it is remarkable that that the corrosion current density of Mg<sub>HT</sub>/TA-APTES/PDMS reached a record low level of 9.931 × 10<sup>−11</sup> A/cm<sup>2</sup> at a high corrosion potential of 0.014 V. This work demonstrates a huge breakthrough for the electrochemical performances of the modified Mg alloys, which provides an efficient strategy to significantly improving its corrosion resistance and extending its applications in implanted electronics, biomedicine, interventional therapy for cardiovascular diseases, etc.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"200 ","pages":"Article 109055"},"PeriodicalIF":6.5,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163691","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号