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首页> 外文期刊>Journal of Applied Polymer Science >CHITIN DERIVATIVES .1. KINETICS OF THE HEAT-INDUCED CONVERSION OF CHITOSAN TO CHITIN
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CHITIN DERIVATIVES .1. KINETICS OF THE HEAT-INDUCED CONVERSION OF CHITOSAN TO CHITIN

机译：甲壳素衍生物1。壳聚糖热转化为甲壳质的动力学

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摘要

The water-soluble solids comprised of the ionic complex between chitosan and acetic acid, chitosonium acetate, are converted into chitin by heating. The thermally-induced conversion of a water-soluble chitosonium acetate in film form into a water-insoluble chitin film was examined by thermal analysis (DMTA, TGA, DSC, and TMA) and by solid state C-13-NMR spectroscopy. Results indicate that tan delta-transitions occur at increasingly high temperatures, and over progressively wider temperature ranges, as the transformation progresses. Likewise, the storage modulus, log E', increases as the chitosonium acetate film undergoes ''cure'' and converts to chitin. Cure kinetic parameters are obtained using the model proposed by Provder et al. modified for glass transition temperature (T-g). The results suggest the existence of two sequential first order reactions, an initial and a late cure reaction, having activation energies of approximately 15 and 21 kcal/mol, respectively. (C) 1996 John Wiley & Sons, Inc. [References: 19]
机译：由壳聚糖和乙酸之间的离子络合物，乙酸壳聚糖组成的水溶性固体通过加热转化为甲壳质。通过热分析（DMTA，TGA，DSC和TMA）和固态C-13-NMR光谱检查了薄膜形式的水溶性乙酸壳聚糖到水不溶性几丁质薄膜的热诱导转化。结果表明，随着转变的进行，tanδ转变会在越来越高的温度下以及逐渐扩大的温度范围内发生。同样，储能模量log E'随着乙酸壳聚糖膜的“固化”并转变为几丁质而增加。使用Provder等人提出的模型获得固化动力学参数。修改玻璃化转变温度（T-g）。结果表明存在两个顺序的一级反应，即初始和后期固化反应，其活化能分别约为15和21 kcal / mol。 （C）1996 John Wiley＆Sons，Inc. [参考：19]

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