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Thermotropic elastomers with poly(oxy‐1,4‐butanediyl) units in the main chain
Author(s) -
Pospiech Doris,
Komber Hartmut,
Voigt Dieter,
Häußler Liane,
Meyer Evelin,
Schauer Gottfried,
Jehnichen Dieter,
Böhme Frank
Publication year - 1994
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.1994.021950731
Subject(s) - thermotropic crystal , transesterification , condensation polymer , copolyester , polymer chemistry , copolymer , tetrahydrofuran , elastomer , materials science , ether , telechelic polymer , polymer , chemistry , end group , organic chemistry , composite material , polyester , catalysis , liquid crystalline , solvent
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.