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题名: Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films
作者: Weidman, Jennifer R.1; Luo, Shuangjiang1; Doherty, Cara M.2; Hill, Anita J.2; Gao, Peiyuan3; Guo, Ruilan1
关键词: Triptycene ; Gas separation membrane ; Physical aging ; Fractional free volume ; Polyimide
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2017-01-15
卷: 522, 页:12-22
收录类别: SCI
英文摘要: The fundamental gas transport properties and physical aging behavior of a series of triptycene-based polyimides with various substitution groups were investigated. Wide-angle x-ray diffraction revealed that the 6FDA-1,4-triptycene polyimides exhibit two chain packing domains with d-spacing values of similar to 6.7 angstrom and similar to 53 angstrom, corresponding to triptycene-induced chain packing disruption and chain segments lacking the triptycene moiety, respectively. Positron annihilation lifetime spectroscopy (PALS) showed a bimodal distribution of microcavity size made up of triptycene cleft cavities that are similar to 3 angstrom diameter and larger interchain cavities with an average diameter of similar to 7 angstrom. Additionally, PALS confirmed 6FDA-1,4-trip_CH3 has the lowest fractional free volume, primarily due to smaller contributions from the inter chain cavities, and 6FDA-1,4-trip_CF3 has the largest fractional free volume. It was also found that the addition of substituent groups had a unique and positive effect on the aging properties over nine months, in which the addition of CH3 and CF3 groups led to permeability increases of similar to 20% and similar to 40%, respectively. This is caused by the combination of the lowered driving force for physical aging, the substituent groups sterically hindering tighter packing with time, and the interconnectivity and/or unblocking of free volume over time through small-scale, local chain motion. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35116
Appears in Collections:其它_期刊论文

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作者单位: 1.Univ Notre Dame, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA
2.CSIRO Mfg, Private Bag 10, Clayton, Vic 3169, Australia
3.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China
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