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Thermotropic Liquid Crystalline Behavior of Poly(1-cholesteryloxycarbonyloxy]ethylene] and Poly[1-(cholesteryloxycarbonylheptanoyloxy)ethylene]  

Jeong, Seung-Yong (Department of Polymer Science and Engineering, Dankook University)
Ma, Yung-Dae (Department of Polymer Science and Engineering, Dankook University)
Publication Information
Polymer(Korea) / v.30, no.1, 2006 , pp. 35-44 More about this Journal
Abstract
Poly[1-(cholesteryloxycarbonyloxy)ethylene](PCOE) and poly[1-(cholesteryloxycarbonylheptanoyloxy)ethylene] (PCOSE) were prepared by reacting poly(vinyl alcohol) with cholesteryl chloroformate or 8-cholesteryloxycarbonylheptanoly] chloride (CH8C), and their thermal and optical properties were investigated. CH8C formed a monotropic cholesteric phase whereas PCOE and PCOSE exihibited enantiotropic cholesteric phases. Like in the case of CH8C, the optical pitch $(\lambda_m)$ of PCOSE decreased with increasing temperature. PCOE, contrast with PCOSE, did not display reflection colors, suggesting that the helical twisting power or the cholesteryl group highly depends on the length or the spacer joining the cholesteryl group to the main chain. The mesophase properties of PCOE and PCOSE were entirely different from those of poly $(cholesteryl-\omega-acryloyloxyalkanoates)$. The results indicate that the mode of chemical linkage of the side chain group with the main chain plays an important role in the formation, stabilization, and temperature dependence of $\lambda_m$ of the cholesteric mesophase.
Keywords
poly(vinyl alcohol); cholesterol; optical pitch; mode of chemical linkage;
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