Influence of degree of deacetylation on critical concentration of chitosan/dichloroacetic acid liquid-crystalline solution

被引：33

作者：

Dong, YM ^{[1
]}

Xu, CY ^{[1
]}

Wang, JW ^{[1
]}

Wu, YS ^{[1
]}

Wang, M ^{[1
]}

Ruan, YH ^{[1
]}

机构：

[1] Xiamen Univ, Dept Mat Sci & Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2002年 / 83卷 / 06期

关键词：

chitin; chitosan; liquid-crystalline polymers; degree of deacetylation; critical concentration;

D O I：

10.1002/app.2286

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We prepared chitosans with various degrees of deacetylation (DDAs) by mixing completely deacetylated chitosan and acetic anhydride at room temperature without serious degradation and O-substitution. We obtained a standard curve to measure DDA by plotting the IR absorbance ratio of A(1560)/A(2880) against the known DDAs (from 1-100%) of 10 specimens. The effect of DDA on the critical concentration (C*) of chitosan/dichloroacetic acid solutions required to form mesophase was investigated by optical methods. A maximum C* value of 23 wt % appeared at a relative medium DDA (similar to 20%). The effect was explained by the disordering of chains with medium composition ratios of the copolymer of glucosamine and N-acetyl glucosamine. (C) 2002 John Wiley & Sons, Inc. J Appl Polym Sci 83: 1204-1208, 2002.

引用

页码：1204 / 1208

页数：5

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