Physical aging of glassy perfluoropolymers in thin film composite membranes. Part II. Glass transition temperature and the free volume model

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• 作者：Milad Yavari^a ; Sajjad Maruf^b ; Yifu Ding^b ; ^{yifu.ding@colorado.edu} ; Haiqing Lin^a ; ^{haiqingl@buffalo.edu}
• 关键词：Thin film composite membranes ; Physical aging ; Glass transition temperature ; Free volume model ; Perfluoropolymers
• 刊名：Journal of Membrane Science
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：525
• 期：Complete
• 页码：399-408
• 全文大小：1149 K
• 卷排序：525

文摘

Nano-thermal analysis determines Tg of selective layers in TFC membranes in situ. A free volume model describes the Tg increase and permeance decrease during physical aging. Polymers with stable permeability should have high free volume and low physical aging rate.