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Liquid‐crystalline polyimides, 28 . Thermoplastic elastomers with smectic hard phase based on 3,5:3′,5′‐biphenyltetracarboximides
Author(s) -
Kricheldorf Hans R.,
Linzer Volker
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021971216
Subject(s) - polyimide , imide , ether , polymer chemistry , materials science , condensation polymer , thermoplastic elastomer , phase (matter) , elastomer , copolymer , polymer , composite material , chemistry , organic chemistry , layer (electronics)
Two series of copoly(ether‐imide)s were prepared by polycondensation of 3,5:3′,5′‐biphenyltetracarboxylic anhydride (BTCA) and mixtures of 4,4′‐(nonamethylenedioxy)dianiline and polytetrahydrofuran (polyTHF) containing two amino end groups. Two samples of polyTHF were used, one sample with a number‐average molecular weight M n = 750 and another sample with M n around 2100. All polycondensations were conducted in the form of a “one‐pot procedure” in refluxing m ‐cresol. The mole ratio of poly‐THF and 4,4′‐(nonamethylenedioxy)dianiline was varied, so that the length of the hard segments varied. Wide‐angle X‐ray scattering (WAXS) powder patterns proved that at least the hard phase of those poly(ether‐imide)s with relatively long hard segments possesses a smectic‐crystalline layered structure analogous to that of the homopolymer derived from BTCA and 4,4′‐(nonamethylenedioxy)dianiline. Only one polyimide showed highly elastic behavior.