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- W1992283721 abstract "Gas separation membrane permselectivity is often improved by the introduction of stiffer polymeric backbone structures. This chain rigidity enables the polymeric segments to discriminate more selectively between penetrants of different size. Although not extensively reported in the literature, ladder and semi-ladder polymers formed from tetraamines and dianhydrides potentially provide rigid polymeric structures void of significant rotational mobility. This work examines the gas transport and sorption properties of BBL, a ladder polymer synthesized from 1,2,4,5-tetraaminobenzene tetrahydrochloride and 1,4,5,8-naphthalenetetracarboxylic acid. In addition, the behavior of He, CO2, O2, N2, and CH4 permeability, diffusion, and sorption coefficients with temperature is examined and shown to follow the Arrhenius and van’t Hoff relationships. The near-ambient permeation properties of BBL are also compared with other previously reported semi-ladder polymers formed using polypyrrolone chemistry. These semi-ladder polymers incorporate both flat, packable monomers such as those used to form BBL as well as bulky monomers to inhibit chain packing." @default.
- W1992283721 created "2016-06-24" @default.
- W1992283721 creator A5040515268 @default.
- W1992283721 creator A5044989838 @default.
- W1992283721 date "1999-09-01" @default.
- W1992283721 modified "2023-09-23" @default.
- W1992283721 title "Comparison of gas transport and sorption in the ladder polymer BBL and some semi-ladder polymers" @default.
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- W1992283721 doi "https://doi.org/10.1016/s0032-3861(98)00777-0" @default.
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