Aging and carbon dioxide plasticization of thin polyetherimide films

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• 作者：Jianzhong Xia^a ; ^b ; ^c ; Tai-Shung Chung^b ; Pei Li^b ; Norman R. Horn^c ; D.R. Paul^b ; ^c ; ^{drp@che.utexas.edu}
• 关键词：Polyetherimide ; Physical aging ; Gas permeation
• 刊名：Polymer
• 出版年：2012
• 期刊代码：83_00323861
• 类别：ms
• 出版时间：25 April, 2012
• 卷：53
• 期：10
• 页码：2099-2108
• 文件大小：2016 K

摘要

Industrial gas separation membranes have selective dense layers with thicknesses around 100聽nm. It has long been assumed that these thin layers have the same properties as thick (bulk) films. However, recent research has shown that thin films with such thickness experience accelerated physical aging relative to bulk films and, thus, their permeation properties can differ significantly from the bulk. Thin films made from Extem^庐 XH 1015, a new commercial polyetherimide, have been investigated by monitoring their gas permeability. The permeability of the thin films is originally greater than the thick films but eventually decreases well below the permeability of the thick film. The CO₂ plasticization of Extem thin films is explored using a series of exposure protocols that indicate CO₂ plasticization is a function of film thickness, aging time, exposure time, pressure and prior history.