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。
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 Acharrs differential method. The function was f（a） = 3 （1-a）2/3, which was considered as shrinkage geometric shape （ball symmetry） mecha- nism. 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.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2012年第4期97-101,共5页
Materials Reports
基金
国家"863"资助项目(2007AA10Z310)
安徽高等学校省级自然科学研究项目(KJ2011B110)
池州学院化学材料与工程省级示范实验中心建设项目(皖教高〔2008〕4号)
池州学院材料学重点学科建设项目(2011XK04)
