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首页> 外文期刊>Journal of Applied Polymer Science >A Kinetic Study of the Thermal Degradation of Chitosan-Metal Complexes
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A Kinetic Study of the Thermal Degradation of Chitosan-Metal Complexes

机译：壳聚糖-金属配合物热降解的动力学研究

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The thermal degradation of metal complexes formed by chitosan with Cu(II), Ni(II), Co(II), and Hg(II), at different metal concentrations, was studied by thermogravimetric analysis in a nitrogen atmosphere over the temperature range 25-800 degrees C. The results indicate that thermal degradation of chitosan and chitosan-metal ion complexes could be of one or two-stage reaction. In the thermal degradation of chitosan with metal complexes, the temperature of initial weight loss and the temperature of maximum weight loss rate decrease. Fourier transform infrared spectroscopy was used to probe the interaction of chitosan with metal ions. The bands of -N-H, -C=O, -C-O-C- groups of chitosan are shifted or change their intensity in the presence of metal. These changes in the characteristic bands are taken as evidence of the influence of metal ions on the thermal stability of chitosan. Broido's method was employed to evaluate the activation energies as a function of the degree of degradation. The presence of metal ions provoked a decrease in the thermal stability of chitosan, which became more marked when the concentration of metal was increased. The dynamic study showed that the apparent activation energy values of the main stage of the thermal degradation of chitosan-metal complexes decrease as the strength of the polymer-metal interaction increases.
机译：通过热重分析，在温度范围25下，通过热重分析研究了壳聚糖与Cu（II），Ni（II），Co（II）和Hg（II）在不同金属浓度下形成的金属配合物的热降解。 -800℃。结果表明，壳聚糖和壳聚糖-金属离子络合物的热降解可以是一阶段或两阶段反应。在壳聚糖与金属配合物的热降解中，初始失重温度和最大失重速率温度降低。傅里叶变换红外光谱用于探测壳聚糖与金属离子的相互作用。壳聚糖的-N-H，-C = O，-C-O-C-基团的带在金属存在下发生位移或改变其强度。特征谱带中的这些变化被视为金属离子对壳聚糖热稳定性影响的证据。使用Broido方法评估活化能与降解程度的关系。金属离子的存在引起壳聚糖的热稳定性下降，当金属浓度增加时，壳聚糖的热稳定性变得更加明显。动力学研究表明，壳聚糖-金属配合物热降解主要阶段的表观活化能值随聚合物-金属相互作用强度的增加而降低。

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