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http://dx.doi.org/10.7317/pk.2012.36.1.076

Thermotropic Liquid Crystalline Behavoir of Hydroxypropyl Celluloses Containing Cyanoazobenzene and Their Photocrosslinked Films  

Kim, Hyo-Gap (Center for Photofunctional Energy Materials, Dankook University)
Jeong, Seung-Yong (Center for Photofunctional Energy Materials, Dankook University)
Yang, Si-Yeul (Center for Photofunctional Energy Materials, Dankook University)
Ma, Yung-Dae (Center for Photofunctional Energy Materials, Dankook University)
Publication Information
Polymer(Korea) / v.36, no.1, 2012 , pp. 76-87 More about this Journal
Abstract
Three kinds of hydroxypropyl cellulose (HPC) derivatives, [6-{4-(4-cyanophenylazo)phenoxy}]hexyloxypropyl celluloses (CAHPCs) with degree of etherification (DET) ranging from 0.4 to 3, fully substituted acrylic acid esters of HPC (HPCA) and CAHPCs (CAHPCAs) were synthesized. The crosslinked HPCA (HPCAG) and CAHPCAs (CAHPCAGs) were also prepared by exposing thermotropic mesophases of HPCA and CAHPCAs to UV light. Both CAHPCs and CAHPCAs with DET ${\leq}$ 1.2, as well as HPC and HPCA, formed enantiotropic cholesteric phases whose optical pitches(${\lambda}_m$'s) increase with temperature, wheras both CAHPCs and CAHPCAs with DET ${\geq}$ 1.4 showed monotropic nematic phases. CAHPCAGs with DET ${\leq}$ 1.2, as well as CAHPCAs with DET ${\leq}$ 1.2, exhibited reflection colors in a wide temperature range. On the other hand, CAHPCAGs with DET ${\geq}$ 1.4, as well as CAHPCAs with DET ${\geq}$ 1.4, showed Schileren textures typical of nematic phase, indicating that the liquid crystalline structure is virtually locked upon photocrosslinking. The isotropization temperatures($T_i$'s) of both CAHPCAs and CAHPCAGs decreased with increasing DET. The $T_i$ of CAHPCAG, however, was higher than that of CAHPCA at the same DET. Moreover, the temperature dependence of ${\lambda}_m$ of CAHPCAGs was much weaker than that of CAHPCAs.
Keywords
hydroxypropyl cellulose; cyanoazobenzene; degree of etherification; photocrosslinking; nematic and cholesteric phases;
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