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Thermotropic Liquid Crystalline Properties of Cholesteryloxycarbonated and (Cholesteryloxycarbonyl) alkanoated Celluloses  

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.32, no.2, 2008 , pp. 169-177 More about this Journal
Abstract
The thermal and optical properties of cellulose tri(cholesteryloxy) carbonate(CCE0) and cellulose tri(cholesteryloxycarbonyl)alkanoates (CCEn, n=$2{\sim}8$, 10, the number of methylene units in the spacer) were investigated. CCE0 formed an enantiotropic cholesteric phase, whereas all the CCEn exhibited monotropic cholesteric phases. CCEn with n=$3{\sim}8$ formed cholesteric phases with left-handed helical structures whose optical pitches (${\lambda}_m) decrease with increasing temperature. On the other hand, CCE0 and CCEn with n=2 or 10 did not display reflection colors over the full cholesteric range, suggesting that the helical twisting power of the cholesteryl group highly depends on the length of the spacer connecting the cholesteryl group to the main chain. The thermal stability and degree of order in the mesophase and the temperature dependence of the ${\lambda}_m$ observed for CCEn highly depended on n. The results were discussed in terms of the differences in the internal plasticization, the arrangement of the side groups, and the conformation of the molecules.
Keywords
cellulose; cholesterol; spacer length; cholesteric phase; optical pitch;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
Times Cited By Web Of Science : 8  (Related Records In Web of Science)
Times Cited By SCOPUS : 10
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