Liquid-crystalline behavior of chitosan in malic acid

被引：16

作者：

Chang, Jenq Sheng

Chang, Ke Liang B.

Tsai, Min Lang

机构：

[1] Natl Taiwan Ocean Univ, Dept Food Sci, Chilung 20224, Taiwan

[2] Ching Kuo Inst Management & Hlth, Dept Food Sci & Technol, Chilung 20301, Taiwan

[3] China Inst Technol, Dept Food Sci, Taipei 11581, Taiwan

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2007年 / 105卷 / 05期

关键词：

liquid-crystalline polymers (LCP); phase behavior; rheology;

D O I：

10.1002/app.26475

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

This report describes how the degree of deacetylation and molecular weight of chitosan and the concentrations of sodium chloride and malic acid affect the formation of lyotropic chitosan liquid crystals. Chitosan samples of various degrees of deacetylation were prepared from P-chitin that was isolated from squid pens. They were degraded by ultrasonic irradiation to various molecular weights. The critical concentrations forming chitosan liquid crystals were determined with a polarized microscope. A chitosan sample with a degree of deacetylation of 67.2-83.6% formed cholesteric lyotropic liquid crystals when it was dissolved in 0.37-2.59M malic acid. The critical concentrations increased with increasing degrees of deacetylation of chitosan. They decreased with increasing molecular weights or increasing concentrations of sodium chloride and malic acid. (C) 2007 Wiley Periodicals, Inc.

引用

页码：2670 / 2675

页数：6