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A series of polyether-based thermoplastic polyure thanes, varying in hard segment content between 20 and 80 weight percent, was prepared using an (oxypropylene-oxyethy lene) diol of M n = 2,000 and 4,4'-diphenyl methane diisocyanate (MDI) extended with 1,4-butanediol (BDO). Physical-mechanical, dynamic-mechanical and specific heat data are used to elucidate the behavior of these materials. The polyurethanes varied from soft elastomeric to high-modulus plastic.
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Zdrahala et al. (1980) studied this question.
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