Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films
文献类型：期刊论文
| 作者 | Weidman, Jennifer R.1; Luo, Shuangjiang1; Doherty, Cara M.2; Hill, Anita J.2; Gao, Peiyuan3; Guo, Ruilan1 |
| 刊名 | JOURNAL OF MEMBRANE SCIENCE
 |
| 出版日期 | 2017-01-15 |
| 卷号 | 522页码:12-22 |
| 关键词 | Triptycene Gas separation membrane Physical aging Fractional free volume Polyimide |
| 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/35116]  |
| 专题 | 化学研究所_其它 |
| 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 |
| 推荐引用方式 GB/T 7714 | Weidman, Jennifer R.,Luo, Shuangjiang,Doherty, Cara M.,et al. Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films[J]. JOURNAL OF MEMBRANE SCIENCE,2017,522:12-22. |
| APA | Weidman, Jennifer R.,Luo, Shuangjiang,Doherty, Cara M.,Hill, Anita J.,Gao, Peiyuan,&Guo, Ruilan.(2017).Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films.JOURNAL OF MEMBRANE SCIENCE,522,12-22. |
| MLA | Weidman, Jennifer R.,et al."Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films".JOURNAL OF MEMBRANE SCIENCE 522(2017):12-22. |
入库方式： OAI收割
来源：化学研究所
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