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- W2013313673 abstract "Abstract Two new dicarboxylic acids were synthesized from trimellitic anhydride anhydride and 1.5-diamino-2-methylpentane or from a mixture of isomeric 1,6-diamino-trimethyl hexanes. These dicarboxylic acids were polycondensed either with the bisacetate of 2,6-dihydroxynaphthalene or with the bisacetate of 4,4′-dihydroxybiphenyl. D.s.c. measurements, WAXD powder patterns and optical microscopy revealed that all four poly(esterimide)s derived from 1,5-diamino-2-methylpentane still form a highly ordered, quasi crystalline smectic layer structure in the solid state, but a nematic phase in the molten state. The poly(ester-imide)s derived from the trimethyl substituted spacers only form a smectic glass in the solid state. This smectic glass is a frozen smectic-A phase in the case of 4a but may be a mixture of frozen smectic-C and smectic-A phases in the case of 4b (derived from 4,4′-dihydroxybiphenyl). Upon heating above the glass-transition the layer structures gradually disappear with formation of a nematic phase. Due to this gradual change revealed by synchrotron radiation measurements no endothermic phase transition is detectable in the d.s.c. traces." @default.
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- W2013313673 date "1997-10-01" @default.
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- W2013313673 title "Layer structures: 7. Thermotropic poly(ester-imide)s based on trimellitic anhydride and branched diamino alkane spacers" @default.
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- W2013313673 doi "https://doi.org/10.1016/s0032-3861(97)00114-6" @default.
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