Synthesis and Characterization of a New Chitosan Derivatives with Liquid Crystalline Behavior--O-Cynaoethylchitosan

Abstract

Abstract: O-cyanoethylchitosan was prepared at room temperature using sodium hydroxide as catalyst. Solubility of O-cyanoethylchitosan was prior to chitosan. While it dissolved, O-cyanoethylchitosan formed typical cholesteric liquid crystalline texture--fingerprint texture. The fingerprint texture can be frozen in films casted from 5% aqueous acetic acid solution. The droplet texture of positive birefriengence can also be observed in these films. Critical concentrations of cyanoethylchitosan in four acidic solvents were determined using polarized microscopy. All critical concentration values were in the range of 19%～20%(volume fraction), independing of the acidity of solvents.

Key words: Chitosan, Cyanoethylchitosan, Lyotropic liquid crystal, Cholesteric phase, Critical concentration

CLC Number:

O631.1

TrendMD:

DONG Yan-Ming, LI Zhi-Qiang. Synthesis and Characterization of a New Chitosan Derivatives with Liquid Crystalline Behavior--O-Cynaoethylchitosan[J]. Chem. J. Chinese Universities, 1998, 19(8): 1343.

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Synthesis and Characterization of a New Chitosan Derivatives with Liquid Crystalline Behavior--O-Cynaoethylchitosan

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