壳聚糖
极限抗拉强度
乙酰化
凝胶渗透色谱法
结晶
渗透
降级(电信)
分子质量
红外光谱学
学位(音乐)
高分子化学
化学
摩尔质量分布
碱金属
材料科学
核化学
化学工程
有机化学
复合材料
聚合物
物理
生物化学
膜
电信
计算机科学
声学
工程类
基因
酶
作者
Seiichi Mima,Masaru Miya,Reikichi Iwamoto,Susumu Yoshikawa
标识
DOI:10.1002/app.1983.070280607
摘要
Abstract A preparative method has been established for obtaining chitosan products which have a desired degree of deacetylation of up to virtually 100%. Effective deacetylation was attained by intermitently washing the intermediate product in water two or more times during the alkali treatment. The weight average molecular weight ( M̄ w ) of the product, which was measured by gel permeation liquid chromatography, was about 5 × 10 5 at the highest deacetylation of nearly 100%, and the degradation of the molecular chain was not so significant. Tensile strength of the wet film increased markedly with increasing degree of deacetylation, while the dry film did not show a corresponding significant increase of the tensile strength. In the infrared spectra of chitosan film new sharp bands appeared especially at the high degree of deacetylation. This was attributed to increased “crystallization” brought about by high deacetylation.
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