Abstract
A new high-performance, miscible polymer blend based on the aramid derived from 3,4′-oxydianiline and isophthaloyl chloride with the polyimide obtained from 4,4′-oxydianiline and 3,3′,4,4′-biphenyltetracarboxylic dianhydride has been prepared. The blends exhibited miscibility over entire composition range as evidenced by single glass transition at a temperature in between those of the component polymers. Unusual composition-dependent upward frequency shifts by 60 cm−1 in the N-H stretching band of the aramid due to dissociation of hydrogen bonding were observed, indicating enthalpy increase in the blend system. The results could be explained by the contribution of the Coleman-Painter’s disorientational entropy change as well as possible side reactions.
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Nakata, S., Kakimoto, Ma. & Imai, Y. Infrared Spectroscopic and Thermal Investigations of a New Miscible Blend System Composed of 3,4′-Oxydianiline Derived Polyisophthalamide and 4,4′-Oxydianiline/3,3′,4,4′-Biphenyltetracarboxylic Dianhydride Based Polyimide. Polym J 25, 569–576 (1993). https://doi.org/10.1295/polymj.25.569
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DOI: https://doi.org/10.1295/polymj.25.569