| 聚对苯撑对苯二甲酰胺液晶的相态转变 |
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| 引用本文： | 陈寿羲,龙程奋,胡世如,徐懋.聚对苯撑对苯二甲酰胺液晶的相态转变[J].高分子学报,1979,0(1):1-7. |
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| 作者姓名： | 陈寿羲 龙程奋 胡世如 徐懋 |
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| 作者单位： | 中国科学院化学研究所
(陈寿羲，龙程奋，胡世如)，中国科学院化学研究所(徐懋) |
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| 摘 要： | 本工作以H(?)ppler流变粘度计、退偏振光法及小角激光光散射法研究了聚对苯撑对苯二甲酰胺的浓硫酸溶液在不同浓度和温度下的粘性行为、光学性质和区域结构的变化,发现聚对苯撑对苯二甲酰胺的各向异性溶液在不同温度下呈现向列型液晶和胆甾型液晶特征,说明芳香聚酰胺的液晶体系与小分子液晶相类似,也具有多种中介相的转变现象。这里的中介相转变是由向列型转变为胆甾型,但不是直接的同时是一个单变性的相转变过程。
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| 收稿时间： | 1978-04-27 |
PHASE TRANSITION OF LIQUID CRYSTAL OF POLY(-P-PHENYLENE TEREPHTHALAMIDE) IN PURESULFURIC ACID SOLUTION |
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| Chen Shou-his,Long Cheng-fen,Hu Shich-rhu,Hsu Mao.PHASE TRANSITION OF LIQUID CRYSTAL OF POLY(-P-PHENYLENE TEREPHTHALAMIDE) IN PURESULFURIC ACID SOLUTION[J].Acta Polymerica Sinica,1979,0(1):1-7. |
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| Authors: | Chen Shou-his Long Cheng-fen Hu Shich-rhu Hsu Mao |
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| Institution: | Institute of Chemistry; Academia Sinica |
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| Abstract: | The viscous behaviour and optical properties of poly (-p-phenylene terephthala-mide) (PPTA) in pure sulfufic acid solution have been studied at varied temperatures and concentrations by Hoppler rheometer, depolarized light transmission and small angle light scattering methods. The anisotropic solution of PPTA shows nema-tic as well as cholesteric mesophase characteristics at different temperatures. This means that the liquid crystals of aromatic polyamides possess similar mesophase transition as the low molecular compounds do. Liquid crystals of PPTA in sulfuric acid solution is changed from nematic at lower temperature to cholesteric mesophase at higher temperature. This change does not take place directly from nematic to cho-lesteric and is essentially a monotropic one. |
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