A facile approach to synthesize poly(benzoxazole- co -imide)s without thermal rearrangement at high temperature is proposed. Poly(benzoxazole- co -imide)s with improved mechanical and solution-processable properties were prepared through polycondensation of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with three synthesized novel benzoxazole-containing diamines and a commercial diamine. These poly(benzoxazole- co -imide)s had high tensile strengths of 110.3–122.0 MPa and good elongation at break of 11.9–26.3%, good thermal stability and high glass transition temperatures ( T g s) of up 306 °C. The effect of chain isomerism on molecular packing and physical and gas transport properties of the poly(benzoxazole- co -imide)s was investigated. The para -connecting isomers exhibited higher molecular weights ( M w s), better mechanical properties, higher T g s, higher chain packing order and better overall performance for CO 2 /CH 4 and CO 2 /N 2 separations as compared to the corresponding meta -connecting ones. This study guides molecular architecture to improve particular membrane separation performance by introducing either para - or meta -connections into polymeric main chains.
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Zhuang et al. (2014) studied this question.
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