摘要
利用非等温加热方式的热分析技术研究磷氮阻燃聚乳酸(PLA)在N_(2)气氛中的热分解行为,分别采用Kissinger方程、Madhusudanan-Krishnan-Ninan(MKN)方程、Kissinger-Akahira-Sunose(KAS)方程和Flynn-Wall-Ozawa(FWO)方程模拟计算阻燃PLA热分解动力学参数,活化能(Ea)计算结果依次为187.62、180.06、179.80、180.95 kJ/mol;指前因子自然对数(ln A)计算结果依次为41.56、24.39~34.60、24.27~34.51和24.92~34.67。最后,选取相对简单的KAS等温积分法,以相对偏差(DR)为目标函数,并利用16种热分解动力学机理数值进行模拟。结果表明:A1/4(随机成核和随后生长)反应机理,即ln(β/T^(2))=ln[-2.54×10^(10)/ln(1-α)]-2.16×10^(4)/T,是描述磷氮阻燃PLA热分解最适反应机理。研究结果对于准确理解PLA的阻燃机理,进而开发高效PLA阻燃体系具有重要意义。
The thermal decomposition behavior of injection-grade polylactic acid(PLA)containing phosphorus-nitrogen flame retardant was studied by non-isothermal thermogravimetric analysis under nitrogen atmosphere.The kinetic parameters of the thermal decomposition of the PLA/IPOI system were obtained by using a differential method and three integral methods,which include Kissinger method,Madhusudanan-Krishnan-Ninan(MKN)method,Kissinger-Akahira-Sunose(KAS)method,and Flynn-Wall-Ozawa(FWO)method.The activation energy(Ea)calculated results by these methods was 187.62,180.06,179.80,180.95 kJ/mol,respectively,and the pre-exponential factors(ln A)calculated results by these methods was 41.56,24.39~34.60,24.27~34.51 and 24.92~34.67,respectively.Finally,based on relative deviation(DR)as the objective function,KAS isothermal integral method was selected for simulation calculation,and 16 values of thermal decomposition kinetic mechanism were used to simulate.The numerical simulation results showed that the random nucleation and subsequent growth reaction mechanism(A1/4),ln(β/T^(2))=ln[-2.54×10^(10)/ln(1-α)]-2.16×10^(4)/T,was the best fit reaction mechanism to describe the thermal decomposition of the flame-retardant PLA/IPOI system.The research results are of great significance for accurately understanding the flame retardancy mechanism of PLA and developing efficient flame retardancy system of PLA.
作者
姚露
刘媛
罗越峰
廖正福
YAO Lu;LIU Yuan;LUO Yuefeng;LIAO Zhengfu(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Shenzhen Mindray Bio-Medical Electronics Co.,Ltd.,Shenzhen 518057,China)
出处
《塑料科技》
北大核心
2025年第9期66-71,共6页
Plastics Science and Technology
关键词
磷氮阻燃聚乳酸
热分解动力学
非等温热重分析
反应机理
Phosphorus-nitrogen flame retardant polylactic acid
Thermal decomposition kinetics
Non-isothermal thermogravimetric analysis
Reaction mechanism
