PP-g-VAc非等温结晶动力学的研究  

Non-isothermal Crystallization Kinetics of PP-g-VAc

作　　者：谭琳[1] 侯金顺[2] 杨万泰[1] 

机构地区：[1]教育部可控化学反应科学与技术基础重点实验室,北京100029 [2]北京化工大学聚合物科学系,北京100029

出　　处：《塑料》2004年第2期65-69,共5页Plastics

摘　　要：用DSC对两种不同接枝率的聚丙烯接枝醋酸乙烯酯共聚物(PP g VAc)进行了非等温结晶动力学的研究,采用Reziorny修正的Avrami方程和莫志深提出的R t法对非等温结晶动力学进行了分析。研究结果表明:这两种方法能够很好地对PP g VAc的非等温结晶过程进行描述,VAc接枝链由于破坏了分子链的规整性并产生部分交联,导致结晶速率和结晶能力降低:结晶时间(t1/2)增大、结晶速率常数(Zc)降低,接枝共聚物的结晶焓降低,聚丙烯结晶成核和生长的方式没有改变,高接枝率下PP(GP=14 8%)的结晶温度上升,结晶参数F(T)随接枝率而增大。The non-isothermal crystallization behaviors of polypropylene graft poly(vinyl acetate) (PP-g-VAc) with two grafting degrees were studied by differential scanning calorimetry.The kinetics of PP and PP-g-VAc under non-isothermal crystallization conditions were analyzed by Reziorny method and R-t method.The results showed that both Reziorny method and R-t method described the crystallization behaviors successfully,VAc side chains didn't change the nucleation and growth patterns,but decreased the crystallization rate and ability: t_1/2 increased and Z_c decreased,nucleation rate of grafted PP at high graft percentage ( GP) increased,crystallization enthalpy decreased and crystallization parameter F(T) increased with GP.

关 键 词：结晶动力学 分子链 结晶速率常数 接枝共聚物 结晶温度 PP 聚丙烯 聚醋酸乙烯酯 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]