Article
Chemistry, Applied
Pradeep Kumar Panda, Jen-Ming Yang, Yen-Hsiang Chang
Summary: In this study, p-coumaric acid-modified water-soluble chitosan (M-Cs) and poly (vinyl alcohol) blended membrane (PVA/M-Cs) were successfully prepared to enhance the water-induced shape memory behavior, with a shape recovery ratio reaching nearly 100%. The addition of M-Cs into the PVA polymer matrix not only improved the shape memory behavior but also decreased the water contact angle value.
CARBOHYDRATE POLYMERS
(2021)
Article
Engineering, Chemical
Julien Muller, Xianyu Ding, Amine Geneste, Jerzy Zajac, Benedicte Prelot, Sophie Monge
Summary: This study focuses on the chemical modification of poly(vinyl alcohol) (PVA) with ethylene diamine tetraacetic acid (EDTA) groups to obtain new water-soluble polymers, named PVA(EDTA). The modified polymers showed enhanced sorption properties for heavy metal ions and good selectivity. The results demonstrated the potential of modifying basic commercial polymers with chelating agents for further applications in Polymer Enhanced Ultrafiltration (PEUF) processes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Polymer Science
Alyona I. Wozniak, Evgeniya V. Bermesheva, Ilya L. Borisov, Sergey A. Rzhevskiy, Andrey A. Tyutyunov, Sergey O. Ilyin, Maxim A. Topchiy, Andrey F. Asachenko, Maxim V. Bermeshev
Summary: In this study, a simplified method for synthesizing silicon-containing vinyl-addition polynorbornenes was proposed, and high conversion and selectivity hydrosilylation reactions were achieved through optimized catalyst selection. The prepared polymers showed good film-forming properties and enhanced gas permeability.
Article
Materials Science, Multidisciplinary
Chidapha Kusinram, Visit Vao-soongnern
Summary: A method for generating and equilibrating amorphous polymer structures, using PVA as an example, was recently developed. The method involves coarse-graining PVA chains, on-lattice MC simulation, reverse mapping, and energy minimization to obtain fully atomistic models. Experimental validation confirmed the accuracy of the atomistic models.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Chemical
Yifan Xia, Sinu C. Rajappan, Dmytro Serhiichuk, Mikkel Rykaer Kraglund, Jens Oluf Jensen, David Aili
Summary: A series of poly(vinyl alcohol-co-vinyl acetal) gel electrolytes were prepared and assessed for their performance as electrode separators in alkaline water electrolysis. The membrane properties could be tuned by varying the degree of functionalization, and a membrane with moderate vinyl acetal content showed good mechanical robustness and ion conductivity. The membrane effectively prevented hydrogen crossover during alkaline water electrolysis tests. The strategies presented in this work have general relevance to the field for the development of new ion-solvating membrane systems.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Polymer Science
Aldona Dluga, Dagmara Bajer, Halina Kaczmarek
Summary: This research focuses on novel ecological materials for biomedical and cosmetic applications. The blends of bionanocellulose and poly(vinyl alcohol), BNC/PVA, were prepared and their properties were examined under UV radiation and high temperature. The results showed that UV irradiation increased the crystallinity degree and changed the mechanical properties of the samples. However, the effects induced by UV-irradiation did not significantly deteriorate the materials' properties designed for medical applications. Thermogravimetric analysis exhibited good thermal stability for all samples.
Article
Polymer Science
Ji-Ting Wang, Zhen Huang, Ya-Tong Zhu, Si-Ning Wang
Summary: In this study, mixed matrix membranes (MMMs) of poly(vinyl alcohol) (PVA) and porous H-beta zeolite were investigated for ethanol, n-propanol, and isopropanol dehydration via pervaporation. The addition of H-beta zeolite resulted in higher permeation flux and better separation efficiency compared to pure PVA, attributed to the zeolite's pore size and hydrophilicity. Overall, PVA/H-beta zeolite MMMs show promising potential for alcohol dehydration applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Lujuan Li, Xiaodong Xu, Lei Liu, Pingan Song, Qianqian Cao, Zhiguang Xu, Zhengping Fang, Hao Wang
Summary: The presence of water significantly reduces the mechanical strength of PVA but increases its plasticity. Additionally, water inclusion lowers the glass transition temperature of PVA, increases free volume, and promotes relaxation and mobility of PVA chains. This is mainly due to the plasticizing and lubricating effects of water on the PVA chains.
Article
Polymer Science
Chujuan Huang, Toyoko Suzuki, Hideto Minami
Summary: In this study, micrometer-sized block copolymer particles were successfully synthesized using iodine transfer polymerization as a first attempt. Methyl methacrylate (MMA) and vinyl acetate (VAc) were used as the hydrophilic monomers in a microsuspension system. The resulting poly(methyl methacrylate)-block-poly(vinyl acetate) (PMMA-b-PVAc) particles exhibited the desired molecular weight and relatively narrow molecular weight distribution, despite the low degree of polymerization of the PVAc block. The hydrolysis of these particles resulted in three different morphologies, and the formation mechanism of each morphology was proposed, attributing it to the interaction between the iodic ions generated from the degradation of iodine end groups and the elongated poly(vinyl alcohol) (PVA) segments derived from PVAc.
Article
Chemistry, Multidisciplinary
Yin Zhang, Yu Wang, Wei You
Summary: Polymer functionalization is a powerful method for preparing polymers with diverse structures without the need for monomer synthesis or polymerization reactions. This study demonstrates the Mitsunobu derivatization of poly(vinyl alcohol) (PVA) to convert hydroxyl groups into different functional groups. The partial acetalation strategy improves the solubility of PVA derivatives and allows for the production of functionalized copolymers. This method enables the convenient one-step preparation of transparent, colorless, flexible, and scalable UV-shielding membranes.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Polymer Science
Dan Zhao, Meisheng Li, Mingmin Jia, Shouyong Zhou, Yijiang Zhao, Wenbo Peng, Weihong Xing
Summary: By incorporating a low-density Schiff base network framework into a high-density poly(vinyl alcohol) matrix, asymmetric pervaporation mixed matrix membranes exhibit improved hydrophilicity, mechanical stability, and separation performance.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Yutaka Ohsedo, Wakana Ueno
Summary: By studying the formation behavior and properties of molecular hydrogels composed of polymer hydrogelators and water-soluble polymers, this research discovered a new type of molecular hydrogel material with thixotropic behavior and spinnable characteristics, which has potential importance in healthcare and medical applications.
Article
Polymer Science
Seong Baek Yang, Mohammad Rezaul Karim, Jungeon Lee, Jeong Hyun Yeum, Sabina Yeasmin
Summary: Novel poly(vinyl alcohol)/poly(vinyl butyral-vinyl alcohol) films with improved hydrophobicity were prepared by saponification of poly(vinyl acetate)/poly(vinyl butyral) blend films. The saponification process was confirmed by various analysis techniques. The hydrophobicity of the films increased with increasing poly(vinyl butyral) content. The saponified films exhibited improved mechanical properties and unique surface characteristics. These films have potential applications in biomaterials, filters, and medical devices.
Article
Materials Science, Multidisciplinary
Yu Lei, Imane Boucenna, Veronique Thevenet, Diana Dragoe, Alain Ponton
Summary: In this study, PVA/GO composites were prepared using the freezing-thawing method, with investigations on their morphology, chemical structure, viscoelastic properties, and absorption of a cationic dye. The results showed that increasing the concentration of GO led to significant improvements in the properties of the composites, particularly in terms of absorption capacity. A correlation between absorption, swelling, and viscoelastic properties was proposed for the PVA/GO composites.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Engineering, Chemical
Chia-Yu Lai, Yi-Ming Sun, Ying-Ling Liu
Summary: This study aimed to improve the performance of poly (vinyl alcohol) (PVA) membranes by adding water-soluble ozonated lignin (Ws-OL) as an additive to increase the water permeation flux. The modified PVA membranes showed enhanced surface hydrophilicity, reduced crystallinity, and smaller crystallite sizes compared to the neat PVA membrane. Under the optimized condition, the PVA membranes modified with 50% Ws-OL and cross-linked with 4-sulfophthalic acid (SPTA) exhibited a water permeation flux of 78,630 g m-2 h-1 and a salt rejection of 99.91% in a 3.5% NaCl(aq) solution at 25 degrees C.
JOURNAL OF MEMBRANE SCIENCE
(2023)
