Pub Date : 2024-11-02DOI: 10.1016/j.reactfunctpolym.2024.106093
Lishuang Yang, Jiayue Wang, Ruili Li, Yujie Gao, Huashan Wang
A novel UV-curable 3D printing resin was synthesized by combining diglycidyl ether of bisphenol A (DGEBA) and acrylamide (AAM) to create a UV-curable acrylamide-modified epoxy resin prepolymer. This prepolymer was then uniformly mixed with the photoinitiator TPO and the reactive diluent hydroxyethyl methacrylate (HEMA). By adjusting the prepolymer content, UV-curable 3D printing resins were formulated with prepolymer concentrations of 30 wt%, 40 wt%, and 50 wt%, respectively. Infrared spectroscopy and nuclear magnetic resonance studies indicated that the amino groups in acrylamide reacted with the epoxy groups. When the prepolymer was added at concentrations of 30 wt% and 40 wt%, the viscosity met the requirements for UV-curable 3D printing. Upon completion of curing, these three distinct resins exhibited high mechanical strength, with tensile strength reaching up to 59.42 MPa and flexural strength peaking at 72.25 MPa. The elongation at break ranged from 2.60 % to 4.91 %. Scanning electron microscopy was used to examine the UV-cured 3D printed samples, and comparison with the design files revealed that the printed samples exhibited excellent dimensional stability. The study results indicated that this novel UV-curable epoxy vinyl resin formulation possessed excellent mechanical properties, suitable curing characteristics, and high resolution, making it a highly promising prepolymer for UV-curable 3D printing.
通过将双酚 A 的二缩水甘油醚 (DGEBA) 和丙烯酰胺 (AAM) 结合在一起，合成了一种新型紫外线固化 3D 打印树脂，即紫外线固化丙烯酰胺改性环氧树脂预聚物。然后将这种预聚物与光引发剂 TPO 和活性稀释剂甲基丙烯酸羟乙酯（HEMA）均匀混合。通过调整预聚物的含量，配制出的紫外固化 3D 打印树脂的预聚物浓度分别为 30 wt%、40 wt% 和 50 wt%。红外光谱和核磁共振研究表明，丙烯酰胺中的氨基与环氧基团发生了反应。当预聚物的添加浓度为 30 wt% 和 40 wt% 时，粘度达到了紫外线固化 3D 打印的要求。固化完成后，这三种不同的树脂表现出很高的机械强度，拉伸强度高达 59.42 兆帕，弯曲强度最高达 72.25 兆帕。断裂伸长率在 2.60 % 到 4.91 % 之间。研究人员使用扫描电子显微镜对紫外固化三维打印样品进行了检测，并与设计文件进行了对比，结果表明打印样品具有良好的尺寸稳定性。研究结果表明，这种新型紫外固化环氧乙烯基树脂配方具有优异的机械性能、合适的固化特性和高分辨率，是一种非常有前途的紫外固化三维打印预聚物。
{"title":"Preparation of UV curable acrylamide modified epoxy resin and performance in 3D printing","authors":"Lishuang Yang, Jiayue Wang, Ruili Li, Yujie Gao, Huashan Wang","doi":"10.1016/j.reactfunctpolym.2024.106093","DOIUrl":"10.1016/j.reactfunctpolym.2024.106093","url":null,"abstract":"<div><div>A novel UV-curable 3D printing resin was synthesized by combining diglycidyl ether of bisphenol A (DGEBA) and acrylamide (AAM) to create a UV-curable acrylamide-modified epoxy resin prepolymer. This prepolymer was then uniformly mixed with the photoinitiator TPO and the reactive diluent hydroxyethyl methacrylate (HEMA). By adjusting the prepolymer content, UV-curable 3D printing resins were formulated with prepolymer concentrations of 30 wt%, 40 wt%, and 50 wt%, respectively. Infrared spectroscopy and nuclear magnetic resonance studies indicated that the amino groups in acrylamide reacted with the epoxy groups. When the prepolymer was added at concentrations of 30 wt% and 40 wt%, the viscosity met the requirements for UV-curable 3D printing. Upon completion of curing, these three distinct resins exhibited high mechanical strength, with tensile strength reaching up to 59.42 MPa and flexural strength peaking at 72.25 MPa. The elongation at break ranged from 2.60 % to 4.91 %. Scanning electron microscopy was used to examine the UV-cured 3D printed samples, and comparison with the design files revealed that the printed samples exhibited excellent dimensional stability. The study results indicated that this novel UV-curable epoxy vinyl resin formulation possessed excellent mechanical properties, suitable curing characteristics, and high resolution, making it a highly promising prepolymer for UV-curable 3D printing.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106093"},"PeriodicalIF":4.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-30DOI: 10.1016/j.reactfunctpolym.2024.106081
Adriana-Petronela Chiriac , Catalin-Paul Constantin , Mihai Asandulesa , Violeta Melinte , Andrzej Jankowski , Mariana-Dana Damaceanu
In the attempt to develop gas separation membranes by reusing polymers with no film-forming ability but with great potential for this purpose, blending has been approached as a simple, time- and cost-effective strategy. Herein, blends of trityl-substituted triphenylamine (TTA)-based polyimides and a fluorinated polyimide (6F-PI) were involved to prepare dense membranes by drop-casting technique. The two blend components involved in variable amounts led to different film morphologies with a strong impact on most blends' properties and gas separation performance. According to optical microscopy, SEM, AFM, and FTIR investigations, the blend series containing hexafluoroisopropylidene (6F) groups in both polyimide components proved to be fully miscible at the molecular levels. When a single 6F-based component was integrated into the blend, the polymers proved to be compatible, but only partially miscible, with a two-phase structure, in which 6F-PI wrapped around the TTA-PI growth fibrillar domains. However, all blends displayed a single glass transition and FTIR bands which do not sum the ones of the polymer components, as well as a high thermal stability, close to that of 6F-PI. Regardless of their miscibility level, all blends behaved as classical polyimide films, with good mechanical properties and chemical resistance to corrosive media like acid vapors or basic solutions. The blend composition and diimide structure of TTA-PI little affected the dielectric behavior, unlike the gas separation performance that strongly depended on these characteristics. The higher amount of 6F groups in the miscible blends endowed the membranes with superior permeability and selectivity, allowing in some cases to surpass the trade-off rule. Generally, the gas permeability decreased with the increase of TTA-PI content, with some exceptions. The low intermolecular interfacial interactions promoted by TTA-PI were found to be beneficial in preserving a good selectivity of gas molecules with a small kinetic diameter (He, CO2) though their permeability is lost. The gas permeability changes as a function of the blend composition and structure were mostly due to changes in the solubility coefficient and less from gas diffusion capability, at least for CO2 and N2.
{"title":"Repurposing trityl-substituted triphenylamine-based polyimides for gas separation membranes by blending with a fluorinated polyimide","authors":"Adriana-Petronela Chiriac , Catalin-Paul Constantin , Mihai Asandulesa , Violeta Melinte , Andrzej Jankowski , Mariana-Dana Damaceanu","doi":"10.1016/j.reactfunctpolym.2024.106081","DOIUrl":"10.1016/j.reactfunctpolym.2024.106081","url":null,"abstract":"<div><div>In the attempt to develop gas separation membranes by reusing polymers with no film-forming ability but with great potential for this purpose, blending has been approached as a simple, time- and cost-effective strategy. Herein, blends of trityl-substituted triphenylamine (TTA)-based polyimides and a fluorinated polyimide (6F-PI) were involved to prepare dense membranes by drop-casting technique. The two blend components involved in variable amounts led to different film morphologies with a strong impact on most blends' properties and gas separation performance. According to optical microscopy, SEM, AFM, and FTIR investigations, the blend series containing hexafluoroisopropylidene (6F) groups in both polyimide components proved to be fully miscible at the molecular levels. When a single 6F-based component was integrated into the blend, the polymers proved to be compatible, but only partially miscible, with a two-phase structure, in which 6F-PI wrapped around the TTA-PI growth fibrillar domains. However, all blends displayed a single glass transition and FTIR bands which do not sum the ones of the polymer components, as well as a high thermal stability, close to that of 6F-PI. Regardless of their miscibility level, all blends behaved as classical polyimide films, with good mechanical properties and chemical resistance to corrosive media like acid vapors or basic solutions. The blend composition and diimide structure of TTA-PI little affected the dielectric behavior, unlike the gas separation performance that strongly depended on these characteristics. The higher amount of 6F groups in the miscible blends endowed the membranes with superior permeability and selectivity, allowing in some cases to surpass the trade-off rule. Generally, the gas permeability decreased with the increase of TTA-PI content, with some exceptions. The low intermolecular interfacial interactions promoted by TTA-PI were found to be beneficial in preserving a good selectivity of gas molecules with a small kinetic diameter (He, CO<sub>2</sub>) though their permeability is lost. The gas permeability changes as a function of the blend composition and structure were mostly due to changes in the solubility coefficient and less from gas diffusion capability, at least for CO<sub>2</sub> and N<sub>2</sub>.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106081"},"PeriodicalIF":4.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-30DOI: 10.1016/j.reactfunctpolym.2024.106085
Szymon Gaca , Kurt Dietliker , Elisabeth Rossegger , Sandra Schlögl
Vat photopolymerisation 3D printing is a convenient approach to fabricating complex polymeric objects based on the localised photocuring of a liquid resin. Advancing from free-radical mediated curing mechanisms, the current study focuses on the vat photopolymerisation 3D printing of photopolymers formed by an ionic click reaction between thiol and epoxy monomers. In this process, selected epoxy monomers are mixed with a tetra-functional thiol crosslinker and a photobase generator, which releases 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) upon light exposure to initiate the anionic ring-opening reaction. FTIR, photo-DSC and rheology studies reveal a slow cure rate of the thiol-epoxy resins at room temperature, which is significantly accelerated by increasing the temperature to 50 °C during light irradiation. By optimising the resin composition, shelf life and viscosity, printing of objects via digital light processing 3D printing is enabled by using a vat heated to 50 °C. The printed thiol-epoxy networks contain ample -OH and ester moieties, which undergo thermo-activated bond exchange reactions. Here, the photochemically liberated DBN molecules act as catalysts to accelerate the transesterification reaction at elevated temperatures (150–180 °C). Rheological measurements demonstrate the efficient and Arrhenius-like behaviour of the networks' stress relaxation, giving rise to the dynamic nature of the printed photopolymers, which is further confirmed by reshaping experiments.
{"title":"Design of photocurable thiol-epoxy resins for the processing of vitrimers with vat photopolymerisation 3D printing","authors":"Szymon Gaca , Kurt Dietliker , Elisabeth Rossegger , Sandra Schlögl","doi":"10.1016/j.reactfunctpolym.2024.106085","DOIUrl":"10.1016/j.reactfunctpolym.2024.106085","url":null,"abstract":"<div><div>Vat photopolymerisation 3D printing is a convenient approach to fabricating complex polymeric objects based on the localised photocuring of a liquid resin. Advancing from free-radical mediated curing mechanisms, the current study focuses on the vat photopolymerisation 3D printing of photopolymers formed by an ionic click reaction between thiol and epoxy monomers. In this process, selected epoxy monomers are mixed with a tetra-functional thiol crosslinker and a photobase generator, which releases 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) upon light exposure to initiate the anionic ring-opening reaction. FTIR, photo-DSC and rheology studies reveal a slow cure rate of the thiol-epoxy resins at room temperature, which is significantly accelerated by increasing the temperature to 50 °C during light irradiation. By optimising the resin composition, shelf life and viscosity, printing of objects via digital light processing 3D printing is enabled by using a vat heated to 50 °C. The printed thiol-epoxy networks contain ample -OH and ester moieties, which undergo thermo-activated bond exchange reactions. Here, the photochemically liberated DBN molecules act as catalysts to accelerate the transesterification reaction at elevated temperatures (150–180 °C). Rheological measurements demonstrate the efficient and Arrhenius-like behaviour of the networks' stress relaxation, giving rise to the dynamic nature of the printed photopolymers, which is further confirmed by reshaping experiments.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106085"},"PeriodicalIF":4.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A water-soluble cellulose acetate (CA) with a degree of acetyl substitution of 0.9 was dissolved in water and mixed with aqueous dispersions of reinforcing cellulose nanofibers (CNFs) at various mass ratios. CA/CNF composite films with CNF contents of 0 %–16 % were prepared by casting and drying the mixtures to improve the fundamental properties of the films. Aqueous dispersions of TEMPO-CNFs containing sodium carboxylate and protonated carboxy groups were separately prepared and used to produce CA composite films (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl radical). Highly transparent CA/TEMPO-CNF films with tensile strengths and Young's moduli more than twofold those of the 100 % CA film were obtained at a TEMPO-CNF content of 16 %. Transmission electron microscopy images of the film cross-sections showed that the TEMPO-CNFs were almost homogeneously and individually distributed in the CA/TEMPO-CNF-COOH composite films. The thermal expansion patterns of the 100 % CA films were characteristically wavy between 30 and 100 °C, and the thermal expansion ratios decreased as the TEMPO-CNF contents of the films increased. The obtained results indicate that CA/CNF mixtures can be used as water-based coatings and paints with favorable properties.
{"title":"Preparation and characterization of nanocellulose-reinforced water-soluble cellulose acetate films","authors":"Hongrun Chen , Gaoyuan Hou , Korawit Chitbanyong , Miyuki Takeuchi , Izumi Shibata , Akira Isogai","doi":"10.1016/j.reactfunctpolym.2024.106083","DOIUrl":"10.1016/j.reactfunctpolym.2024.106083","url":null,"abstract":"<div><div>A water-soluble cellulose acetate (CA) with a degree of acetyl substitution of 0.9 was dissolved in water and mixed with aqueous dispersions of reinforcing cellulose nanofibers (CNFs) at various mass ratios. CA/CNF composite films with CNF contents of 0 %–16 % were prepared by casting and drying the mixtures to improve the fundamental properties of the films. Aqueous dispersions of TEMPO-CNFs containing sodium carboxylate and protonated carboxy groups were separately prepared and used to produce CA composite films (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl radical). Highly transparent CA/TEMPO-CNF films with tensile strengths and Young's moduli more than twofold those of the 100 % CA film were obtained at a TEMPO-CNF content of 16 %. Transmission electron microscopy images of the film cross-sections showed that the TEMPO-CNFs were almost homogeneously and individually distributed in the CA/TEMPO-CNF-COOH composite films. The thermal expansion patterns of the 100 % CA films were characteristically wavy between 30 and 100 °C, and the thermal expansion ratios decreased as the TEMPO-CNF contents of the films increased. The obtained results indicate that CA/CNF mixtures can be used as water-based coatings and paints with favorable properties.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106083"},"PeriodicalIF":4.5,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.reactfunctpolym.2024.106082
Shuo Liu , Xinxin Mao , Qinglong Qu , Fade Li , Jianqing Mao , Jiahui Chen , Haiping Ma , Hongzhen Wang
Bromobutyl rubber has numerous applications in industries such as tires, sealing capsules, and aerospace, so enhancing its aging resistance is a critical issue. However, the addition of amine antioxidants to Bromobutyl rubber results in the occurrence of unique storage hardening and storage scorching phenomenon, which lead to the deterioration of the rubber's properties. To examine the impact of various types of amine antioxidants on the storage stability and aging resistance of Bromobutyl rubber, we conducted comparative experiments using five types of amine antioxidants and one phenolic antioxidant. The purpose was to investigate the effect of amine antioxidants on the storage stability and overall performance of Bromobutyl rubber. The results indicate that the inclusion of p-phenylenediamine antioxidants (4020, 4010NA) greatly facilitates the occurrence of storage hardening and storage scorching phenomenon in Bromobutyl rubber, leading to a deterioration in rubber performance. Therefore, it is advisable to refrain from using high-activity p-phenylenediamine antioxidants when working with Bromobutyl rubber.
{"title":"Effect of antioxidant structure on bromobutyl rubber composites' processability and age resistance","authors":"Shuo Liu , Xinxin Mao , Qinglong Qu , Fade Li , Jianqing Mao , Jiahui Chen , Haiping Ma , Hongzhen Wang","doi":"10.1016/j.reactfunctpolym.2024.106082","DOIUrl":"10.1016/j.reactfunctpolym.2024.106082","url":null,"abstract":"<div><div>Bromobutyl rubber has numerous applications in industries such as tires, sealing capsules, and aerospace, so enhancing its aging resistance is a critical issue. However, the addition of amine antioxidants to Bromobutyl rubber results in the occurrence of unique storage hardening and storage scorching phenomenon, which lead to the deterioration of the rubber's properties. To examine the impact of various types of amine antioxidants on the storage stability and aging resistance of Bromobutyl rubber, we conducted comparative experiments using five types of amine antioxidants and one phenolic antioxidant. The purpose was to investigate the effect of amine antioxidants on the storage stability and overall performance of Bromobutyl rubber. The results indicate that the inclusion of <em>p</em>-phenylenediamine antioxidants (4020, 4010NA) greatly facilitates the occurrence of storage hardening and storage scorching phenomenon in Bromobutyl rubber, leading to a deterioration in rubber performance. Therefore, it is advisable to refrain from using high-activity <em>p</em>-phenylenediamine antioxidants when working with Bromobutyl rubber.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106082"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.reactfunctpolym.2024.106075
Jianjun Wang , Mengqi Wang , Xu Ji , Sixia Yang , Ping Zhang , Bianfeng Yang , Shiyan Yang , Youbo Dou , Yonggui Tao
Ion exchange membranes play a crucial role in the study of microbial desalination cells (MDC). This study introduces a novel N-LAC/MoS2/PVDF ion exchange membrane prepared via chemical grafting, emphasizing its role in enhancing MDC efficiency. The research thoroughly assesses the membrane's microstructure, infrared spectroscopy, and water flux, revealing how the composite additives enhance hydrophilicity, alter contact angles, and improve pore structure. The incorporation of hydrophilic groups like hydroxyl, carboxyl, and carbonyl groups into the membrane significantly improves its hydrophilicity. The optimal performance is achieved with 1 wt% N-LAC/MoS2, increasing porosity to 86.94 % (a 25.5 % increase from pure PVDF) and reducing the contact angle to 71.59° (a 14.12 % decrease from pure PVDF). It also achieves an 84.1 % desalination efficiency under set conditions. The membrane shows high removal efficiency for methylene blue (MB) and Pb2+, reaching up to 93–96 % for MB and 91–94 % for Pb2+ under different pH, concentration, temperature, and salinity conditions. Its reusability is also notably enhanced. This work presents a tailored composite material for MDCs, offering insights into its interaction mechanisms and performance contributions to the MDC system, marking a significant advancement in membrane-based desalination technology.
{"title":"Preparation and performance study of N-LAC/MoS2/PVDF ion exchange membrane in microbial desalination cells","authors":"Jianjun Wang , Mengqi Wang , Xu Ji , Sixia Yang , Ping Zhang , Bianfeng Yang , Shiyan Yang , Youbo Dou , Yonggui Tao","doi":"10.1016/j.reactfunctpolym.2024.106075","DOIUrl":"10.1016/j.reactfunctpolym.2024.106075","url":null,"abstract":"<div><div>Ion exchange membranes play a crucial role in the study of microbial desalination cells (MDC). This study introduces a novel N-LAC/MoS<sub>2</sub>/PVDF ion exchange membrane prepared via chemical grafting, emphasizing its role in enhancing MDC efficiency. The research thoroughly assesses the membrane's microstructure, infrared spectroscopy, and water flux, revealing how the composite additives enhance hydrophilicity, alter contact angles, and improve pore structure. The incorporation of hydrophilic groups like hydroxyl, carboxyl, and carbonyl groups into the membrane significantly improves its hydrophilicity. The optimal performance is achieved with 1 wt% N-LAC/MoS<sub>2</sub>, increasing porosity to 86.94 % (a 25.5 % increase from pure PVDF) and reducing the contact angle to 71.59° (a 14.12 % decrease from pure PVDF). It also achieves an 84.1 % desalination efficiency under set conditions. The membrane shows high removal efficiency for methylene blue (MB) and Pb<sup>2+</sup>, reaching up to 93–96 % for MB and 91–94 % for Pb<sup>2+</sup> under different pH, concentration, temperature, and salinity conditions. Its reusability is also notably enhanced. This work presents a tailored composite material for MDCs, offering insights into its interaction mechanisms and performance contributions to the MDC system, marking a significant advancement in membrane-based desalination technology.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106075"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.reactfunctpolym.2024.106077
Chenhuai Deng , Yuanhao Lin , Xuehui Ge , Hongjie Yang , Linxi Hou , Longqiang Xiao
This work reports the synthesis of CO2/ultraviolet (UV) light dual-responsive CABC-type asymmetric tetrablock polymers (CABC-ATP) based on organocatalyzed reversible complexation-mediated radical polymerization (RCMP) with methyl methacrylate (MMA), 2-Propenoic acid, 2-methyl-4-methyl-2-oxo-2H-1-benzopyran-7-yl ester (CMMA), and 2-(dimethylamino)ethyl methacrylate (DMAEMA) as block monomers by three steps. The obtained CABC-ATP has controllable number average molecular weight (Mn) and narrow molecular weight distribution (Mw/Mn = 1.18–1.29). The hydrodynamic diameter and fluorescence intensity were measured using dynamic light scattering coupled with fluorescence assays. Notably, the vesicle volume increased from an initial measurement of 247.6 nm to 285.4 nm post-experiment. The initial fluorescence emission intensity recorded was 4971, which decreased to 1412 following the introduction of carbon dioxide for 20 min. Subsequently, the fluorescence intensity recovered to 5199 upon nitrogen exposure. The response behavior of CABC-ATP to UV light is due to the cross-linking of coumarin-based monomer, resulting in the change of fluorescence intensity at the macro level. Besides, the protonation of tertiary amine is promoted by the stimulation of CO2, generating of the change of vesicle volume at the micro level.
{"title":"Facile synthesis of carbon dioxide and UV light dual-responsive asymmetric tetrablock polymers","authors":"Chenhuai Deng , Yuanhao Lin , Xuehui Ge , Hongjie Yang , Linxi Hou , Longqiang Xiao","doi":"10.1016/j.reactfunctpolym.2024.106077","DOIUrl":"10.1016/j.reactfunctpolym.2024.106077","url":null,"abstract":"<div><div>This work reports the synthesis of CO<sub>2</sub>/ultraviolet (UV) light dual-responsive CABC-type asymmetric tetrablock polymers (CABC-ATP) based on organocatalyzed reversible complexation-mediated radical polymerization (RCMP) with methyl methacrylate (MMA), 2-Propenoic acid, 2-methyl-4-methyl-2-oxo-2H-1-benzopyran-7-yl ester (CMMA), and 2-(dimethylamino)ethyl methacrylate (DMAEMA) as block monomers by three steps. The obtained CABC-ATP has controllable number average molecular weight (<em>M</em><sub>n</sub>) and narrow molecular weight distribution (<em>M</em><sub>w</sub>/<em>M</em><sub>n</sub> = 1.18–1.29). The hydrodynamic diameter and fluorescence intensity were measured using dynamic light scattering coupled with fluorescence assays. Notably, the vesicle volume increased from an initial measurement of 247.6 nm to 285.4 nm post-experiment. The initial fluorescence emission intensity recorded was 4971, which decreased to 1412 following the introduction of carbon dioxide for 20 min. Subsequently, the fluorescence intensity recovered to 5199 upon nitrogen exposure. The response behavior of CABC-ATP to UV light is due to the cross-linking of coumarin-based monomer, resulting in the change of fluorescence intensity at the macro level. Besides, the protonation of tertiary amine is promoted by the stimulation of CO<sub>2</sub>, generating of the change of vesicle volume at the micro level.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106077"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work introduces a novel thin-film nanocomposite membrane, designed for highly efficient chiral separation, utilizing functionalized Multi-walled Carbon Nantubes (COOH-MWCNTs) and carbon quantum dots (CQDs). Fabricated via interfacial polymerization on a polysulfone support embedded with COOH-MWCNTs, the membrane was evaluated for its ability to separate racemic mixtures of 3,4-dihydroxyphenylalanine, tryptophan, threonine, tyrosine, and 1-methyltryptophan. The optimized membrane composition was found to be 3 % COOH-MWCNTs and 2 % CQDs in 4 bar operating pressure, feed concentrations at 10 mmol·L−1, and temperature at 35 °C, under which an enantiomeric excess (%ee) was achieved as 99 % for L-tryptophan in the permeate side, the highest among the five tested racemic mixtures. This enhanced separation performance is driven by the synergistic role of COOH-MWCNTs in the support layer and the precise interactions between CQDs and D-tryptophan in the active layer. Additionally, the membrane exhibited excellent long-term stability and antifouling properties, ensuring sustained performance over ten permeation cycles. The membrane's outstanding enantioselectivity, mechanical robustness, and durability represent a significant breakthrough in chiral separation technologies.
{"title":"Functionalized carbon nanotube-quantum dot thin film nanocomposite membrane for separation of β-substituted-α-amino acid enantiomers","authors":"Monti Gogoi , Alimpia Borah , Rajiv Goswami , Hrishikesh Sarmah , Akhil Ranjan Borah , Binoy K. Saikia , Swapnali Hazarika","doi":"10.1016/j.reactfunctpolym.2024.106079","DOIUrl":"10.1016/j.reactfunctpolym.2024.106079","url":null,"abstract":"<div><div>This work introduces a novel thin-film nanocomposite membrane, designed for highly efficient chiral separation, utilizing functionalized Multi-walled Carbon Nantubes (COOH-MWCNTs) and carbon quantum dots (CQDs). Fabricated via interfacial polymerization on a polysulfone support embedded with COOH-MWCNTs, the membrane was evaluated for its ability to separate racemic mixtures of 3,4-dihydroxyphenylalanine, tryptophan, threonine, tyrosine, and 1-methyltryptophan. The optimized membrane composition was found to be 3 % COOH-MWCNTs and 2 % CQDs in 4 bar operating pressure, feed concentrations at 10 mmol·L<sup>−1</sup>, and temperature at 35 °C, under which an enantiomeric excess (%ee) was achieved as 99 % for L-tryptophan in the permeate side, the highest among the five tested racemic mixtures. This enhanced separation performance is driven by the synergistic role of COOH-MWCNTs in the support layer and the precise interactions between CQDs and D-tryptophan in the active layer. Additionally, the membrane exhibited excellent long-term stability and antifouling properties, ensuring sustained performance over ten permeation cycles. The membrane's outstanding enantioselectivity, mechanical robustness, and durability represent a significant breakthrough in chiral separation technologies.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106079"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-26DOI: 10.1016/j.reactfunctpolym.2024.106076
Kehao Fan , Quanling Zhao , Meiyi Zou , Zhiyong Qin , Xiaoyu Peng
In this paper, a new green method for preparing multifunctional chitosan-based aerogels was prepared by using natural plant polyphenols instead of traditional chemical crosslinking agents. The aerogel was crosslinked by a Schiff base reaction between chitosan and cellulose aldehyde, and then functionalized with gallic acid to enhance the structure and endow antibacterial properties. The aerogel displayed a three-dimensional, cross-linked porous structure and exhibited selective adsorption of anionic dyes. The theoretical maximum adsorption capacity of amaranth was 450.89 mg/g. The adsorption process is more consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that the adsorption process is monolayer chemical adsorption. The aerogel exhibited superior adsorption performance at a pH value of 4, with the adsorption mechanism predominantly being electrostatic adsorption. The maximum inhibition zones of the aerogels on E. coli and S. aureus were 19.8 mm and 16.8 mm, respectively, and the adsorption value of Cr (VI) was greater than 160 mg/g. The chitosan-based aerogel proposed in this paper may be a promising material for treating complex wastewater containing dyes and heavy metals.
{"title":"Gallic acid modified and green cross-linked chitosan-dialdehyde cellulose antibacterial aerogels and adsorption of anionic dyes","authors":"Kehao Fan , Quanling Zhao , Meiyi Zou , Zhiyong Qin , Xiaoyu Peng","doi":"10.1016/j.reactfunctpolym.2024.106076","DOIUrl":"10.1016/j.reactfunctpolym.2024.106076","url":null,"abstract":"<div><div>In this paper, a new green method for preparing multifunctional chitosan-based aerogels was prepared by using natural plant polyphenols instead of traditional chemical crosslinking agents. The aerogel was crosslinked by a Schiff base reaction between chitosan and cellulose aldehyde, and then functionalized with gallic acid to enhance the structure and endow antibacterial properties. The aerogel displayed a three-dimensional, cross-linked porous structure and exhibited selective adsorption of anionic dyes. The theoretical maximum adsorption capacity of amaranth was 450.89 mg/g. The adsorption process is more consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that the adsorption process is monolayer chemical adsorption. The aerogel exhibited superior adsorption performance at a pH value of 4, with the adsorption mechanism predominantly being electrostatic adsorption. The maximum inhibition zones of the aerogels on <em>E. coli</em> and <em>S. aureus</em> were 19.8 mm and 16.8 mm, respectively, and the adsorption value of Cr (VI) was greater than 160 mg/g. The chitosan-based aerogel proposed in this paper may be a promising material for treating complex wastewater containing dyes and heavy metals.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106076"},"PeriodicalIF":4.5,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-26DOI: 10.1016/j.reactfunctpolym.2024.106078
Chaohua Peng, Longying Zhao, Xinjie Ma, An Huang, Guorong Chen, Weiang Luo, Conghui Yuan, Lizong Dai
Coatings with liquid repellent or antifouling ability are highly desirable in various fields. However, it is still a challenge to prepare solvent-free and room-temperature curable coating with high hardness, great antifouling performance, durability and large-area applicability. Herein, a novel strategy is reported to prepare organic/silicone hybrid coating by using amine-closed hyperbranched polysiloxane (SHPSi) as a latent curing, and diisocyanate containing a small amount of PFPE as an organic connecting part. In the presence of moisture, the mixture of the latent curing and the organic part can be cured at room temperature, and the smooth and low surface energy coating was obtained. The prepared hybrid coating had great transparency with the transmittance over 90 %. Due to the migration tendency of the PFPE to the air side, the surface energy of the hybrid coating decreased from 35.9 mJ/m2 to 13.5 mJ/m2 with 0.5 wt% PFPE, and the hybrid coating exhibited excellent antifouling ability. Besides, the hybrid coating can maintain the antifouling ability even after 2000 abrasion cycles. Furthermore, the great stability for various corrosive solutions and UV radiation was also achieved. More interestingly, the hybrid coating can be employed to protect various substrates, and large-area substrate was also realized. Therefore, this work would promote the application of high-performance organic/silicone hybrid coatings in an eco-friendly way.
{"title":"Solvent-free room-temperature curable organic/silicone hybrid coating with high transparency and durable antifouling ability","authors":"Chaohua Peng, Longying Zhao, Xinjie Ma, An Huang, Guorong Chen, Weiang Luo, Conghui Yuan, Lizong Dai","doi":"10.1016/j.reactfunctpolym.2024.106078","DOIUrl":"10.1016/j.reactfunctpolym.2024.106078","url":null,"abstract":"<div><div>Coatings with liquid repellent or antifouling ability are highly desirable in various fields. However, it is still a challenge to prepare solvent-free and room-temperature curable coating with high hardness, great antifouling performance, durability and large-area applicability. Herein, a novel strategy is reported to prepare organic/silicone hybrid coating by using amine-closed hyperbranched polysiloxane (SHPSi) as a latent curing, and diisocyanate containing a small amount of PFPE as an organic connecting part. In the presence of moisture, the mixture of the latent curing and the organic part can be cured at room temperature, and the smooth and low surface energy coating was obtained. The prepared hybrid coating had great transparency with the transmittance over 90 %. Due to the migration tendency of the PFPE to the air side, the surface energy of the hybrid coating decreased from 35.9 mJ/m<sup>2</sup> to 13.5 mJ/m<sup>2</sup> with 0.5 wt% PFPE, and the hybrid coating exhibited excellent antifouling ability. Besides, the hybrid coating can maintain the antifouling ability even after 2000 abrasion cycles. Furthermore, the great stability for various corrosive solutions and UV radiation was also achieved. More interestingly, the hybrid coating can be employed to protect various substrates, and large-area substrate was also realized. Therefore, this work would promote the application of high-performance organic/silicone hybrid coatings in an eco-friendly way.</div></div>","PeriodicalId":20916,"journal":{"name":"Reactive & Functional Polymers","volume":"205 ","pages":"Article 106078"},"PeriodicalIF":4.5,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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