Synthesis and liquid crystalline properties of new thermotropic polyurethanes

被引：0
|
作者：
Lian, Yanqing
Ll, Mingqi
Zhan, Jun
Zhou, Qixiang
Liu, Deshan
机构：
来源：
Polymer Journal | / 31卷 / 12期
关键词：
Liquid crystal polymers - Thermotropic liquid crystals - Synthesis (chemical) - Monomers - Esters - Polymerization - Nematic liquid crystals - Optical microscopy - X ray crystallography - Differential scanning calorimetry;
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摘要：
Mesogenic diol monomer, terephthaloyl dioxydibenzoic acid diol ester (n = 2, 3, 4, 5, 6), were prepared from ω-hydroxyalkyl-4-hydroxybenzoate and terephthalyl chloride, using Schotten-Baumann Reaction. New liquid crystalline polyurethanes (LCPUs) were obtained by solution polymerization mesogenic diol monomers with 4,4 prime -diphenylmethane diisocyanate (MDI) and 2,4-tolylene diisocyanate (2,4-TDI). The monomer and polyurethanes were investigated by DSC, polarizing microscopy, wide-angle X-ray diffraction (WAXD), small-angle X-ray diffraction (SAXD) and high temperature X-ray diffraction. All LCPUs synthesized showed a nematic LC nature with wide temperature range.
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页码：1189 / 1193
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