Thermal degradation of poly(lactic acid) measured by thermogravimetry coupled to Fourier transform infrared spectroscopy
Thermal degradation of poly(lactic acid) measured by thermogravimetry coupled to Fourier transform infrared spectroscopy
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DOI：
10.1007/s10973-009-0121-5
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发表时间：
2009-06
影响因子：
4.4
通讯作者：
H. Zou;Changhai Yi;Luoxin Wang;Hongtao Liu;Weilin Xu
中科院分区：
文献类型：
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作者：
H. Zou;Changhai Yi;Luoxin Wang;Hongtao Liu;Weilin Xu
采用热重-傅里叶变换红外光谱联用技术研究了聚乳酸（PLA）的热分解过程。对分解产物的FTIR分析显示出丙交酯分子、乙醛、一氧化碳和二氧化碳的释放。乙醛和二氧化碳存在直到实验结束，而一氧化碳在高于峰值温度时逐渐降低，因为较高的温度受益于链均裂和二氧化碳的产生。用热重法研究了聚乳酸在氮气中的热降解动力学。结果表明，聚乳酸的热降解动力学可以用多步降解机理来解释。用Ozawa-Flynn-Wall法和Friedman法计算的活化能与Kissinger法计算的活化能吻合较好。三种方法计算的聚乳酸的活化能分别为177.5 kJ mol−1、183.6 kJ mol− 1和181.1 kJ mol−1。
Thermal decomposition of poly(lactic acid) (PLA) has been studied using thermogravimetry coupled to Fourier transform infrared spectroscopy (TGA-FTIR). FTIR analysis of the evolved decomposition products shows the release of lactide molecule, acetaldehyde, carbon monoxide and carbon dioxide. Acetaldehyde and carbon dioxide exist until the end of the experiments, whereas carbon monoxide gradually decreases above the peak temperature in that the higher temperature benefits from chain homolysis and the production of carbon dioxide. A kinetic study of thermal degradation of PLA in nitrogen has been studied by means of thermogravimetry. It is found that the thermal degradation kinetics of PLA can be interpreted in terms of multi-step degradation mechanisms. The activation energies obtained by Ozawa–Flynn–Wall method and Friedman’s method are in good agreement with that obtained by Kissinger’s method. The activation energies of PLA calculated by the three methods are 177.5 kJ mol−1, 183.6 kJ mol−1and 181.1 kJ mol−1, respectively.