Studies on Lyotropic and Thermotropic Liquid Crystalline Behavior of Cyanoethylhydroxypropyl Chitosan

Abstract

Abstract: Cyanoet hylhydroxypropyl chitosan was synthesized by hydroxypropylation of chitosan followed by cyanoet hylation.The degree of hydroxypropylation and cyanoet hylation was 3.2 and 1.0 respectively.Both cyanoet hylhydroxypropyl chitosan(CNHPC'S)and hydroxypropyl chitosan (HPCS)demonst rated lyot ropic liquid crystalline behaviors, and fingerprint texture was observed in Their concent rated solutions implying The presence of cholesteric phase.The critical concent ra-tion of HPCS in DCA(29%)is higher than CNHPCS's(17%), owing to The enhanced chain rigidity cont ributed by The int roduction of cyanoet hylgroup.In The case of CNHPC'S, cholesteric Thermot ropic mesopHase could be observed between its melting point 193℃ and decomposition temperat ure 220℃ measured by Both DSC and polarized light microscope.SALS was employed to determine The pitch of cholesteric phase in CNHPC'S as received film.The results were consis-tent with those of PLM.

Key words: Chitosan, Cyanoet hylhydroxypropyl chitosan, Hydroxypropyl chitosan, Lyotropic liquid crystal, Thermot ropic liquid crystal

CLC Number:

O631

TrendMD:

DONG Yan-Ming, YUAN Qing, XIAO Zi-Lan, WANG Jian-Wei, MEI Xue-Feng . Studies on Lyotropic and Thermotropic Liquid Crystalline Behavior of Cyanoethylhydroxypropyl Chitosan[J]. Chem. J. Chinese Universities, 1999, 20(1): 140.

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Studies on Lyotropic and Thermotropic Liquid Crystalline Behavior of Cyanoethylhydroxypropyl Chitosan

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