Thermotropic Phase Transition of Liquid Crystalline Solution of Chitosan/Dichloroacetic Acid

Abstract

Abstract: The thermotropic phase transition of liquid crystaLIne solution of chitosan/dichloroacetic acid(DCA) was st udied by means of DSC.When The polymer concentrationc, was higher t han the crit ical one, c^*, an clear endothermal peak attributed to The anisot ropicisot ropic phase t ransition of chitosan solution was observed on DSC heating trace.The exothermal peak was obviously observed on DSC trace upon cooling from above the 五笔字型电子计算机汉 clearing-t emperature because of The reverse phase t ransition.It was found that The lyotropic solution of chitosan/DCAcan exhibit Thermotropic behavior and The liquid crystalline phase form ation in solution is also nucleation cont rolled.Similar to The crystaLIne polymer, The thermotropic phasetransition for liquid crystaline solution of chitosan/dichloroacetic acid is influenced by history of the liquid crystalline phase formation.In addition, The Thermotropic phaset ransition was verified by The polarized light microscopy observation as well as by the changes of depolarizing t ransmit tance intensity as The function of temperature.

Key words: Chitosan, Lyotropic liquid crystal, Thermotropic phase transition, Nucleation mechanism

CLC Number:

O636

TrendMD:

HU Zhong-Ming, LI Rui-Xia, WU Da-Cheng, SUN Yu-Shan, LIU Hong-Bin, WU LI-Heng . Thermotropic Phase Transition of Liquid Crystalline Solution of Chitosan/Dichloroacetic Acid[J]. Chem. J. Chinese Universities, 1999, 20(1): 153.

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Thermotropic Phase Transition of Liquid Crystalline Solution of Chitosan/Dichloroacetic Acid

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