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⵵/ȣ 1993 / ȣ: V.5,no.2,Jun
1() Spacer ȭ Thermotropic Polyamide Copolyamide ռ
2(Ÿ) Synthesis of Thermotropic Liquid-Crystalline Polyamides and Copolyamides Containing a Different Spacer in the Main Chain and Their Structure Interpretation
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ʷ Synthesis and liquid-crystallinites of thermotropic polyamides and copolyamides were investigated. Thermotropic polyamides and copolyamides containing a flexible spacer in the backbone were obtained by the two or three components melt polycondensations of 4,4\\\'-dicarboxy--diphenoxy alkane as an A components, 4,4\\\'-diacetoamido-3,3\\\' dimethoxybiphenyl as a B, 1,4-diacetoamido-benzene (diacetylated p-phenylenediamine) was used as another amide-group-forming minomer. The content of the amide groups in the thermotropic polyamide and Copolyamide widely varied depending on the structure of the amide-group forming diacetoamido monomers. A polymer (9CLDI) showed a typical nematic texture between 218 () and 345() The melting points of the members of this series of polymers increased with decreasing methylene spacer. The polymer structure and mesmorphic nature were examined by solid and solution -NMR spectroscopy, cross polarizing microscopy with a hot stage.
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