Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films

Weidman, Jennifer R.; Luo, Shuangjiang; Doherty, Cara M.; Hill, Anita J.; Gao, Peiyuan; Guo, Ruilan

doi:10.1016/j.memsci.2016.09.013

Title: Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films

Journal Article · Sat Sep 10 00:00:00 EDT 2016 · Journal of Membrane Science

DOI:https://doi.org/10.1016/j.memsci.2016.09.013· OSTI ID:1534095

Weidman, Jennifer R. ^[1]; Luo, Shuangjiang ^[1]; Doherty, Cara M. ^[2]; Hill, Anita J. ^[2]; Gao, Peiyuan ^[3]; Guo, Ruilan ^[1]

University of Notre Dame, IN (United States)
Commonwealth Scientific and Industrial Research Organization (CSIRO), Victoria (Australia)
Chinese Academy of Sciences (CAS), Beijing (China)

In this report 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 ~6.7 Å and ~5.3 Å, 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 ~3 Å diameter and larger interchain cavities with an average diameter of ~7 Å. Additionally, PALS confirmed 6FDA-1,4-trip_CH₃ has the lowest fractional free volume, primarily due to smaller contributions from the interchain 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 ~20% and ~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.

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Research Organization:: University of Notre Dame, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); ACS Petroleum Research Fund; Australian Research Council

Grant/Contract Number:: SC0010330; 56144-DNI10; DE40101359

OSTI ID:: 1534095

Alternate ID(s):: OSTI ID: 1397957

Journal Information:: Journal of Membrane Science, Vol. 522, Issue C; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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physical aging
fractional free volume
polyimide

Title: Analysis of governing factors controlling gas transport through fresh and aged triptycene-based polyimide films

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