KINETIC STUDY OF THERMAL DECOMPOSITION OF POLY(L-LACTIDE)AND ITS β-ZEOLITE COMPOSITES
Thermal decomposition study of poly(L-lactide)(PLA)and its β-zeolite composites has been carried out through differential thermal analysis(DTA)measurements and thermogravimetric(TG)analysis.The experimental data were collected with the heating rates of 5-30 K min-1 from ambient temperature up to 750 K under nitrogen atmosphere.The thermal degradation of PLA and PLA/β-zeolite composites is observed to mainly occur in the temperature range of 560-660 K and 550-675 K,respectively.With Flynn-Wall-Ozawa(FWO)method,the activation energy Ea of PLA and its β-zeolite composites was estimated and PLA/β-zeolite composites have required higher activation energy for thermal decomposition reaction than neat PLA.As the first-order mechanism is assumed,the pre-exponential factor lnA of PLA and its composites can be readily obtained so as to simulate the thermal conversion curves.The simulated results show that the first-order reaction mechanism has resulted in certain large deviations,especially at the low conversion levels.By scanning the well-known 27 mechanism functions,the D5 mechanism of Zhuravlev,Lesokin,Tempelman equation is found to be the most suitable mechanism for thermal decomposition reaction of PLA and its β-zeolite composites.
Poly(L-lactide) β-zeolite Thermogravimetric analysis Kinetics Thermal decomposition simulation Reaction mechanism
Qiao-qiao Ye Yuhua Hao Zhen Huang
Department of Packaging Engineering,Institute of Materials Science and Chemical Engineering,Tianjin Department of Packaging Engineering,Institute of Materials Science and Chemical Engineering,Tianjin
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-6
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）