采用多重扫描速率法研究了壳聚糖和甲壳素2种物质的热分解动力学,2种物质的反应活化能E和指前因子lnA分别为(157.81±1.23)、(171.67±3.16)kJ/mol和(26.49±0.26)、(24.20±0.62)min-1。Achar微分法判定了两者的热分解最概然机理函数,壳聚糖的热分解机理函数为f(α)=2(1-α)3/2,属级数反应;甲壳素的分解机理函数为f(α)=3/2(1-α)2/3[1-(1-α)1/3]-1,属三维扩散、球形对称机理。

DSC non isothermal multiple scan curves were applied to investigate the pyrolysis kinetics of chitosan and chitin.The apparent activation energy(E) and frequency factor(lnA) for thermal decomposition were(157.81 ± 1.23) 、(171.67 ± 3.16) kJ/mol and(26.49 ± 0.26) 、(24.20 ± 0.62) min-1,respectively.And the most probable mechanism functions were obtained by Achar’s differential method.The functions of chitosan and chitin were f(α) =2(1-α) 3/2 and f(α) =3/2(1-α) 2/3[1-(1-α) 1/3]-1,which was considered as 2/3 order chemical reaction and 3D diffusion and ball symmetry mechanism.