Comparison of thermal and cholesteric mesophase properties among the three kind of hydroxypropylcellulose (HPC) derivatives
Comparison of thermal and cholesteric mesophase properties among the three kind of hydroxypropylcellulose (HPC) derivatives
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三种羟丙基纤维素（HPC）衍生物的热性能和胆甾中间相性能比较
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
P. Sixou
中科院分区：
文献类型：
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作者：
T. Yamagishi;F. Guittard;M. Godinho;A. Martins;A. Cambon;P. Sixou
合成了3种系列的（2-羟丙基）纤维素（HPC）衍生物，即酯（ES）、醚（ET）和含氟碳成分的酯（FES），并比较了它们的热性能和热稳定性。随着取代度的降低，ES的光学螺距增大。与ES相反，ET的光学螺距随着DS的减小而减小。胆甾-各向同性转变温度随取代基碳原子数的变化呈现奇偶振荡。在相同温度和取代基碳数下，ET和FES的反向光学螺距分别大于ES。
SummaryThree kind series of (2-hydroxypropyl)cellulose (HPC) derivatives, the esters (ES), the ethers (ET) and the esters containing fluorocarbon components (FES) were prepared, and the thermal and cholesteric mesophase properties were compared among them. The optical pitch of ES increased with decreasing the degree of substitution (DS). Contrary to ES, the optical pitch of ET decreased with decreasing DS. The cholesteric-isotropic transition temperature of FES exhibited the even-odd oscillation according to the number of carbons in substituent. The reverse optical pitches of ET and FES were larger than that of ES, respectively, at the same temperature and at the same number of carbons in substituent.