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Thermal induced structural rearrangement of cardo-copolybenzoxazole membranes for enhanced gas transport properties

Authors :
Huan Wang
K.P. Pramoda
Yin Fong Yeong
Tai-Shung Chung
Source :
Journal of Membrane Science. :51-65
Publication Year :
2012
Publisher :
Elsevier BV, 2012.

Abstract

We have successfully designed amendable polybenzoxazole materials with enhanced gas transport properties via incorporation of cardo moiety into thermally rearrangeable polymer chains. A series of cardo-copoly(hydroxyimide) have been synthesized by polycondensation of dianhydride with various molar ratios of two different ortho -functional diamine sources: 3,3′-dihydroxybenzidine (non-cardo) and 9,9-bis(3-amino-4-hydroxyphenyl)fluorene (cardo). The effect of cardo-containing diamine composition in the range of 5–50 mol% on the structural and gas transport properties of the copolybenzoxazole membranes have been systematically investigated in the present work. It is found that the incorporation of cardo group has increased the gas permeability significantly. Thermally rearranged copolybenzoxazole membrane with the addition of 10 mol% of cardo moiety has shown the largest enhancement in gas permeability. An increment of 3 times in CO 2 permeability has been achieved as compared to the CO 2 permeability in the non-cardo counterparts. The excellent features of the cardo-copolybenzoxazole shows a promising approach for the future cavity engineering in the field of high performance materials.

Details

ISSN :
03767388
Database :
OpenAIRE
Journal :
Journal of Membrane Science
Accession number :
edsair.doi...........6c8a701795b0ba7a2bf6a2f65af24827
Full Text :
https://doi.org/10.1016/j.memsci.2012.01.010