PLA/ZnO复合材料的非等温热解动力学研究

Study on Thermostability and Non-isothermal Thermal Decomposition Kinetics of PLA/ZnO Composites

利用热重分析(TGA)技术,对聚乳酸(PLA)/纳米氧化锌(ZnO)复合材料在惰性气体条件下的热性能和非等温热解动力学进行了研究。结果表明,随着纳米ZnO含量的增加,PLA/ZnO复合材料的热失重曲线向低温方向移动,材料的起始分解温度和最大降解速率对应的温度均降低,即材料的热稳定性降低。采用Kissinger和Ozawa(F-W-O)两种方法进行热解动力学研究,发现随着ZnO含量增加,复合材料的热解活化能(Ea)先增后降,表明ZnO含量对复合材料的热稳定性有显著影响。

The thermostability and non-isothermal thermal decomposition kinetics of polylactic acid(PLA)/nano zinc oxide(ZnO)composites under inert gas conditions were investigated by thermogravimetric analysis(TGA).The results showed that with the increase of nano-ZnO content,the thermogravimetric curve of PLA/ZnO composites moved to the low temperature,and the temperature of initial decomposition and the maximum degradation rate of the materials decreased,which meaned the thermal stability of the composites decreased.The addition of ZnO reduced the thermostability of the composites.Kissinger and Ozawa(F-W-O)were used to study the thermal decomposition kinetics,and the results showed that the thermal decomposition activation energy(Ea)first increased and then decreased with the increasing of ZnO content,and the ZnO content had a significant effect on the thermal stability of the composites.