| 天然水溶性甲壳素的热稳定性研究 |
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| 引用本文： | 刘廷国,李斌.天然水溶性甲壳素的热稳定性研究[J].材料导报,2012,26(4):97-101. |
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| 作者姓名： | 刘廷国 李斌 |
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| 作者单位： | 1. 华中农业大学食品科技学院,武汉430070;池州学院化学与食品科学系,池州247100
2. 华中农业大学食品科技学院,武汉,430070 |
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| 基金项目： | 国家"863"资助项目，安徽高等学校省级自然科学研究项目，池州学院化学材料与工程省级示范实验中心建设项目，池州学院材料学重点学科建设项目 |
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| 摘 要： | 采用多重扫描速率法研究了利用冻融循环制备的天然水溶性甲壳素(WSC)的热分解反应动力学,反应活化能E和指前因子lnA分别为(194.31±1.56)kJ/mol和(37.90±0.36)min-1。采用Achar微分法判定该物质的热分解最概然机理函数为f(α)=3(1-α)2/3,属几何形态收缩(球形对称)机理。热处理样品残渣的红外光谱分析结果显示,WSC热分解过程与壳聚糖一样,最先发生的是糖链的解聚,即C-O-C键的断裂。
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| 关 键 词： | 水溶性甲壳素 热分解 动力学 多重扫描速率 |
Thermal Stability of Natural Water Soluble Chitin |
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| LIU Tingguo
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LI Bin.Thermal Stability of Natural Water Soluble Chitin[J].Materials Review,2012,26(4):97-101. |
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| Authors: | LIU Tingguo LI Bin |
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| Affiliation: | 1 (1 College of Food Science and Technology,Huazhong Agricultural University,Wuhan 430070;2 Department of Chemistry and Food Science,Chizhou University,Chizhou 247100) |
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| Abstract: | Multiple scan rate nonisothermal DSC curves were employed to investigate the pyrolysis kinetics of a natural water soluble chitin(WSC),which was prepared using alkali-freezing-thawing treatment.The apparent activation energy(E) and frequency factor(lnA) for thermal decomposition were(194.31±1.56)kJ/mol and(37.90±0.36)min-1,respectively.And the most probable mechanism function was obtained by Achar′s differential method.The function was f(α)= 3(1-α)2/3,which was considered as shrinkage geometric shape(ball symmetry) mechanism.FT-IR spectra of the residues of WSC after heating under different procedure show that the thermal decomposition process is similar as chitosan,which is first occurred in the molecular chain depolymerization,viz the C-O-C bond cleavage. |
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| Keywords: | water soluble chitin pyrolysis kinetic multiple scan rates |
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