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The paper describes the synthesis of thermotropic elastomers from trimellitimide‐terminated poly(oxy‐1,4‐butanediyl) [synonyms: poly(tetramethylene ether glycol), PTMG; poly(tetrahydrofuran), poly(THF)] and acetoxy group‐terminated rigid blocks. Copolyester imides are formed by transesterification polycondensation in the melt. According to 13 C NMR investigations, their chain sequence distribution is characterized by a block‐like structure in which the preformed rigid units are partially exchanged by transesterification reactions during the melt polycondensation. The degree of transesterification depends on the reaction time. The influence of the length of the flexible PTMG units and of the concentration of rigid units on the phase behaviour as well as on the thermal behaviour and the dynamic‐mechanical behaviour of the block copolymers is discussed with respect to aromatic model compounds.
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Pospiech et al. (1994) studied this question.
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