化学
极限抗拉强度
聚四氟乙烯
静电纺丝
膜
收缩率
延伸率
多孔性
聚乙烯醇
化学工程
抗撕裂性
高分子化学
复合材料
退火(玻璃)
聚合物
材料科学
工程类
生物化学
作者
Evgeny Melnik,Ksenia S. Stankevich,Alexey Alexeevich Zinovyev,Ekaterina Poletykina,А. А. Андреев,В. М. Бузник,E. N. Bolbasov
标识
DOI:10.1016/j.jfluchem.2022.110062
摘要
Electrospinning is a modern alternative to the expanded method for producing porous polytetrafluoroethylene membranes. High strength and relative elongation, as well as the ability to maintain these properties for a long time when exposed to aggressive media at high temperatures, determine the application scope of the electrospun polytetrafluoroethylene membranes. Herein, we report the effect of Polytetrafluoroethylene/Polyvinyl alcohol ratio in the electrospinning solution, heat treatment mode (quenching and annealing) and aggressive media at high temperatures on the shrinkage, tensile strength and relative elongation of electrospun polytetrafluoroethylene membranes. We found that decreased Polytetrafluoroethylene/Polyvinyl alcohol ratio in the electrospinning solution increases shrinkage, but improves tensile strength and relative elongation of polytetrafluoroethylene membranes. Quenching of membranes after heating is a more preferable treatment option than annealing as it allows to obtain the membrane with less shrinkage and better mechanical properties. Exposure of electrospun polytetrafluoroethylene membranes to concentrated mineral acids and alkalis, a bipolar aprotic solvent, engine oil and deionized water at 100 °C for 48 h did not deteriorate their tensile strength and relative elongation.
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