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Thermotropic Liquid Crystalline Behavior of Hydroxypropyl Celluloses Bearing Cholesteryl and Nitroazobenzene Groups  

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.5, 2008 , pp. 446-457 More about this Journal
Abstract
Three kinds of hydroxypropyl cellulose (HPC) derivatives: 6- (cholesteryloxycarbonyl) pentoxypropyl celluloses(CHPCs) with degree of esterification(DE) ranging from 0.6 to 3, 6-[4-{4'-(nitrophenylazo)phenoxycarbonyl}] pentoxypropyl celluloses (NHPCs) with DE ranging from 0.4 to 3, and fully 6-(cholesteryloxycarbonyl) pentanoated NHPCs (CNHPCs) were synthesized, and their thermotropic liquid crystalline properties were investigated. All the CHPCs and NHPCs with $DE{\leq}1.7$ formed enantiotropic cholesteric phases, whereas CNHPCs with 6-(cholesteryloxycarbonyl) pentanoyl DE(DEC) more than 1.6 exhibited monotropic cholesteric phases. On the other hand, NHPCs with $DE{\geq}2.4$ and CNHPCs with $DEC{\leq}1.3$ showed monotropic nematic phases. NHPCs with $DE{\leq}l$, as well as HPC, formed right-handed helices whose optical pitches (${{\lambda}_m}) increase with temperature, while all the CHPCs formed left-handed helices whose ${{\lambda}_m} decrease with temperature. In contrast with these derivatives, NHPCs with $1.4{\leq}DE{\leq}1.7$ and CNHPCs with $DEC{\geq}1.6$ did not display reflection colors over the full cholesteric range, suggesting that the helical twisting power of the cellulose chain and the cholesteryl group highly depends on the chemical structure and DE of mesogenic group.
Keywords
hydroxypropyl cellulose; cholesterol; nitroazobenzene; degree of esterification; temperature dependence of optical pitch; helical sense;
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Times Cited By KSCI : 11  (Citation Analysis)
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