PBS膨胀阻燃体系的热降解动力学分析  

A Kinetic Study on Thermal Degradation of IFR-PBS Composites

作　　者：毛龙[1,2] 文涛[2] 刘跃军[1,2] 

机构地区：[1]厦门理工学院材料科学与工程学院,福建厦门361024 [2]湖南工业大学包装新材料与技术重点实验室,湖南株洲412007

出　　处：《厦门理工学院学报》2016年第3期93-98,共6页Journal of Xiamen University of Technology

基　　金：湖南省研究生科研创新项目(CX2016B632);国家自然科学基金项目(11372108);湖南省自然科学基金项目(14JJ5021);厦门理工学院高层次人才项目(YKJ14035R)

摘　　要：通过熔融共混用四元碳酸根型层状双羟基金属氧化物(LDHs)、膨胀阻燃剂(IFR)和全降解材料聚丁二酸丁二醇酯(PBS)制备出PBS膨胀阻燃体系,并采用热重分析仪(TG)研究PBS、PBS/IFR和PBS/IFR/LDHs在N2氛围下不同升温速率的热降解动力学行为.结果表明:随着升温速率的增加,PBS膨胀阻燃体系的热降解温度及热降解速率最大时的温度均升高;Kissinger法和Flynn-Wall-Ozawa法求得该体系的表观活化能基本一致,但IFR的加入明显降低了PBS的活化能,这是由PBS自身作为大分子炭源参与成炭等过程导致的;LDHs的加入,促进了IFR提前分解以及基材PBS的成炭,从而进一步降低了PBS的活化能;PBS膨胀阻燃体系的热降解反应属于核增长与生长机理控制,而非界面化学反应控制.Intumescent flame retardant poly butylene succinate（ IFR-PBS） composites were prepared using LDHs,IFR and fully-degradable PBS,and a kinetic study on thermal degradation was made with PBS、PBS /IFR and PBS / IFR / LDHs at different heating rates in nitrogen atmosphere. It is found that with the increase of heating rate, temperature increases of thermal degradation and at the maximum thermal degradation rate of IFR-PBS composites. Activation energies obtained by Kissinger method and Flynn-Wall-Ozawa method are similar,but IFR＇s joining decreases the activation energy of PBS significantly because PBS decomposes into carbon as a macromolecule carbon source. LDHs accelerate IFR decomposing ahead of time and carbon formation of PBS so that the activation energies obtained by PBS is further reduced,which is in consistent with the results of the limiting oxygen index（ LOI）. The thermal degradation behavior of PBS-IFR system is a control of nucleation and growth mechanism rather than a control of the interfacial chemical reaction.

关 键 词：热降解 复合材料 聚丁二酸丁二醇酯 膨胀阻燃 动力学模型 

分 类 号：O633.14[理学—高分子化学]