| STUDIES ON THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS:POLY (ARYLENE TEREPHTHALATECO-HEXAMETHYLENE TEREFHTHALATE) |
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| 引用本文： | 张鸿志,汪平平,冯新德. STUDIES ON THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS:POLY (ARYLENE TEREPHTHALATECO-HEXAMETHYLENE TEREFHTHALATE)[J]. 高分子科学, 1988, 0(2): 123-128 |
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| 作者姓名： | 张鸿志 汪平平 冯新德 |
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| 作者单位： | Department of Chemistry，Peking University，Beijing，Department of Chemistry，Peking University，Beijing，Department of Chemistry，Peking University，Beijing |
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| 摘 要： | A series of copolyesters based on terephthaloyl chloride, hexamethylene glycol and hydroquinone or chlorohydroquinone were prepared. The copolymers showed composition-dependent liquid crystalline properties as verified by visual observation of stir-opalescence, polarizing microscope and DSC. The copolyesters with aromatic diol contents over a certain extent (x≥0.2) were thermotropic with wide liquid crystalline temperature ranges. Comparing with the copolyesters based on butylene glycol or ethylene glycol, the minimum fraction of aromatic diol (x value) used to get the liquid crystallinity for all these copolyesters is around 0.2 regardless of the chain lengths of aliphatic glycols. ~1H-NMP studies revealed that copolyesters have microstructure of block sequence distribution and the mesogenie segments shorter than triad with three phenyl nuclei will not provide the liquid crystallinity.
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| 收稿时间： | 1986-11-18 |
STUDIES ON THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS:POLY (ARYLENE TEREPHTHALATECO-HEXAMETHYLENE TEREFHTHALATE) |
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| ZHANG Hongzhi,WANG Pingping,FENG Xinde. STUDIES ON THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS:POLY (ARYLENE TEREPHTHALATECO-HEXAMETHYLENE TEREFHTHALATE)[J]. Chinese Journal of Polymer Science, 1988, 0(2): 123-128 |
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| Authors: | ZHANG Hongzhi WANG Pingping FENG Xinde |
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| Affiliation: | Department of Chemistry; Peking University; Beijing |
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| Abstract: | A series of copolyesters based on terephthaloyl chloride, hexamethylene glycol and hydroquinone or chlorohydroquinone were prepared. The copolymers showed composition-dependent liquid crystalline properties as verified by visual observation of stir-opalescence, polarizing microscope and DSC. The copolyesters with aromatic diol contents over a certain extent (x≥0.2) were thermotropic with wide liquid crystalline temperature ranges. Comparing with the copolyesters based on butylene glycol or ethylene glycol, the minimum fraction of aromatic diol(x value) used to get the liquid crystallinity for all these copolyesters is around 0.2 regardless of the chain lengths of aliphatic glycols.1-NMP studies revealed that copolyesters have microstructure of block sequence distribution and the mesogenic segments shorter than triad with three phenyl nuclei will not provide the liquid crystallinity. |
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| Keywords: | Liquid crystalline copolyesters Poly(arylene terephthalate-co-hexamethylene terephthalate) Minimum mesogenic fraction Sequence distribution Microstrueture parameters/ |
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