ISSN:
0887-6266
Keywords:
permeability and permselectivity of gases in fluorinated polybenzoxazoles
;
polybenzoxazoles, fluorinated, gas permeability and permselectivity in
;
glassy polymers, gas permeation and permselectivity in
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Gas permeability and permselectivity are investigated for polybenzoxazoles from bis(3-amino-4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane (BAHHP) and aromatic diacid chlorides. Effects of thermal cyclization on the permeation properties are also investigated. The polybenzoxazole from BAHHP and 4,4′-(1,1,1,3,3,3-hexafluoroisopropylidene)dibenzoyl chloride (HFDB) displays high performance for CO2/CH4 separation ( \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm P}_{{\rm CO}_2 } $\end{document}= 6.1 × 10-9 cm3 (STP) cm-1 s-1 cm-Hg-1, and \documentclass{article}\pagestyle{empty}\begin{document}$ {{{\rm P}_{{\rm CO}_2 } } \mathord{\left/ {\vphantom {{{\rm P}_{{\rm CO}_2 } } {{\rm P}_{{\rm CH}_4 } }}} \right. \kern-\nulldelimiterspace} {{\rm P}_{{\rm CH}_4 } }} $\end{document}= 38 at 35°C). The polybenzoxazole from BAHHP and 2,6-naphthalene dicarbonyl chloride displays high performance for H2/CO or H2/CH4 separation ( \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm P}_{{\rm H}_2 } $\end{document}= 2.4 × 10-9 cm3 (STP) cm-1 s-1 cm-Hg-1, \documentclass{article}\pagestyle{empty}\begin{document}$ {{{\rm P}_{{\rm H}_2 } } \mathord{\left/ {\vphantom {{{\rm P}_{{\rm H}_2 } } {{\rm P}_{{\rm CO}} }}} \right. \kern-\nulldelimiterspace} {{\rm P}_{{\rm CO}} }} $\end{document}= 71, and \documentclass{article}\pagestyle{empty}\begin{document}$ {{{\rm P}_{{\rm H}_2 } } \mathord{\left/ {\vphantom {{{\rm P}_{{\rm H}_2 } } {{\rm P}_{{\rm CH}_{\rm 4} } }}} \right. \kern-\nulldelimiterspace} {{\rm P}_{{\rm CH}_{\rm 4} } }} $\end{document}= 250). Permeation properties for the polybenzoxazole from BAHHP and HFDB are close to those for a polyimide of similar chemical structure. The permeation properties are discussed in connection with packing density and local segmental mobility. © 1992 John Wiley & Sons, Inc.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1992.090301106
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