不变动力学参数法研究热固性阻燃聚乳酸的热降解动力学  

Study on Thermal Degradation Kinetics of Flame-Retarded Thermosetting Polylactic Acid by Invariant Dynamic Parameter Method

作　　者：杨凯[1] 罗顺[1] 陈勰 李建波[1] 任天斌[1] 任杰[1] Yang Kai, Luo Shun, Chen Xie, Li Jianbo, Ren Tianbin1,Ren Jie(School of Materials Science and Engineering, Tongji University, Shanghai 201804,Chin)

机构地区：[1]同济大学材料科学与工程学院

出　　处：《塑料科技》2018年第4期24-28,共5页Plastics Science and Technology

摘　　要：以9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）为阻燃剂,制备了热固性阻燃聚乳酸材料,利用热重分析仪（TGA）获得了不同升温速率下热固性阻燃聚乳酸材料热降解过程的热重曲线,并应用不变动力学参数法建立其热降解动力学模型,评估了18个动力学函数对材料热降解过程的贡献率。研究发现：随着热降解转化率（α）的增加,材料的热降解活化能呈缓慢上升趋势;阻燃剂DOPO的加入提高了热固性聚乳酸材料的热稳定性,并改变了各个动力学函数对热降解的贡献率,但没有改变聚乳酸热降解的核心机制。A kind of flame-retarded thermosetting polylactic acid （TPLA） was prepared by using 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide （DOPO） as the flame retardant. Then the thermal degradation curves of TPLA and TPLA-DOPO （flame-retarded TPLA） under different heating rate were obtained by thermal gravimetric analyzer （TGA）. The thermal degradation kinetics models were founded through application of the invariant kinetic parameter method, and their contribution rates for the 18 kinetic functions were estimated. The results show that, with the increase of the thermal degradation conversion （a）, there is a slow upward trend of thermal degradation activation energy of TPLA-DOPO. The addition of flame retardant DOPO improves the thermal stability of TPLA, and changes the contribution rate of the 18 kinetic functions, but not changes the core mechanism of the thermal degradation.

关 键 词：热固性聚乳酸 阻燃 热降解动力学 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]