热氧老化对氮气气氛下聚碳酸酯热稳定性的影响  

Effect of thermal-oxidative aging on thermal stability of polycarbonate in nitrogen atmosphere

作　　者：赵乐[1] 赵阳阳[1] 高建国 赵永仙[1] 王辉[1] 肖作良[1] 

机构地区：[1]青岛科技大学,橡塑材料与工程教育部重点实验室,山东省橡塑材料与工程重点实验室,山东省青岛市266042 [2]青岛出入境检验检疫局,山东省青岛市266001

出　　处：《合成树脂及塑料》2013年第4期33-35,共3页China Synthetic Resin and Plastics

基　　金：国家自然科学基金(NO.51243002);山东省自然科学基金(ZR2010EM025);青岛市科技发展计划(NO.12-1-4-3-(1)-JCH);(国家质检总局)公益性行业科研专项(NO.20100009)

摘　　要：采用热空气加速聚碳酸酯(PC)老化的方式进行不同时间下的老化实验,然后在氮气气氛下进行热失重分析,并用Coats-Redfern法和Freeman-Carroll法进行热分解动力学分析。结果表明:老化初期,PC起始分解温度、半失重温度和最大失重温度以及热降解活化能均呈下降趋势;PC的热稳定性下降,主要发生断链和端基脱落;老化后期,PC的起始分解温度、半失重温度和最大失重温度以及热降解活化能又均增大,因PC的交联可使其热稳定性有所提高。The thermal-oxidative aging expefiruenls of polyearbonate （PC） were eatTied out by aec.eleration of hot air for dift）renl aging time, and then PC was analyzed by thermogravimetry （TG） in nitrogen and its kinetics of thermal degradation was studied with Coals-Redfern method and Freeman-Carroll method. The results show that the inilial decomposition temperature, temperature of half mass-loss, temperature of maximum mass-loss rate and activation energy of thermal degradation of PC tend downwards at the early stage of aging. Chain rupture and end group dissociation are dominant reactions, and the thermal stability of PC declines. At the late stage of aging, the temperattures above mentioned and activation energy of thermal degradation of PC increase. The thermal stability of PC is improved because cross-linking reaction occurs at this stage.

关 键 词：聚碳酸酯 热氧老化 热稳定性 降解活化能 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]