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首页> 外文期刊>Polymers for advanced technologies >Polymeric liquid crystals: cholesteric superstructure from blends of hydroxypropylcellulose esters
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Polymeric liquid crystals: cholesteric superstructure from blends of hydroxypropylcellulose esters

机译：聚合液晶：羟丙基纤维素酯混合物的胆甾型超结构

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摘要

n-Butyric, iso-butyric, n-valeric and iso-valeric esters of hydroxypropylcellulose were synthesized. Their behaviors, in terms of cholesteric structure, glass (T{sub}g) and anisotropic-isotropic (T{sub}i) transition temperatures are compared to results in the literature. A 6-8 month time period from sample preparation has no influence on the cholesteric phase characteristics. Six binary blends may be formed from the four esters. They show only a value at each composition, which suggests a good miscibility among the components. However, positive deviation of linearity of T{sub}g VS. composition varies from one pair to another. Analysis of the absorption curves in UV-vis spectra show that three pairs form a single cholesteric helix containing both components while other three give a only nematic phase. Colors changing from red to violet are shown for blends of n-butyric and iso-butyric esters at different weight ratio.
机译：合成了羟丙基纤维素的正丁酸酯，异丁酸酯，正戊酸酯和异戊酸酯。将它们在胆甾型结构，玻璃（T {sub} g）和各向异性-各向同性（T {sub} i）转变温度方面的行为与文献中的结果进行了比较。从样品制备开始的6-8个月的时间段对胆甾相特征没有影响。可以由四种酯形成六种二元共混物。它们仅显示每种组成的值，这表明各组分之间具有良好的混溶性。但是，T {sub} g VS的线性正偏差。组成因一对而异。紫外-可见光谱中吸收曲线的分析表明，三对形成一个包含两种成分的胆甾醇螺旋，而其他三对仅形成向列相。对于不同重量比的正丁酸酯和异丁酸酯的混合物，显示了从红色变为紫色的颜色。

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