稀土β成核剂对PPR非等温结晶动力学影响  

Non-isothermal Crystallization Kinetics of PPR ContainingβNucleating Agent

作　　者：柴振中[1] 郭绍辉[1] 冯嘉春[2] 刘又一[2] 郑德 黄锐[4] 钱玉英 

机构地区：[1]中国石油大学(北京)化工学院,北京102249 [2]复旦大学高分子科学系,上海200433 [3]广东炜林纳功能材料有限公司,广东佛山528521 [4]四川大学材料科学与工程学院,四川成都610065

出　　处：《现代塑料加工应用》2007年第2期40-44,共5页Modern Plastics Processing and Applications

基　　金：国家高技术研究发展计划"863"资助项目(2003AA324010);上海市科委资助项目(0552580395);上海市自然科学基金项目(06ZR14007)。

摘　　要：对添加稀土β成核剂的无规共聚聚丙烯(PPR)非等温结晶动力学进行了研究,采用修正Avrami方程的Jeziorny法和莫志深法对差示扫描量热法(DSC)所得的数据进行处理。结果表明,纯PPR的非等温结晶行为适合Jeziorny法和莫志深法,同时莫志深法可以很好地描述β成核剂改性PPR(βPPR)的非等温结晶行为,但Jeziomy法不能。添加0.05％(质量分数)的β成核剂就可以起到成核作用,提高PPR的结晶度,并使得PPR的结晶温度升高;但是在相同的冷却速率下,纯PPR达到一半结晶度所需的时间(t_(1/2))和结晶峰半峰宽(△W)比βPPR的值要小;同时达到相同的结晶度βPPR所需的冷却速率要大于纯PPR的,这说明β成核剂的加入降低了PPR的结晶速率。The non-isothermal crystallization behaviors of ethylene-propylene random copolymer （PPR） with and without β nucleating agent were studied by means of differential scanning calorimetry （DSC）, respectively. The modified Avrami theories of Jeziorny and Mo method were used to analyze the DSC data. The results show that the Jeziorny method of revised Avrami is fit for the process of pristine PPR well, but not for that of β PPR satisfactorily, while the Mo method can describe both of them very well. Addition of 0.05% （mass fraction）β nucleating agent can give rise to the nucleation effect, which increases the crystallization degree and heightens the peak value of crystallization temperature of PPR. At the same cooling rate, the values of t1/2 and AW of pristine PPR are smaller than that of β nucleated PPR. Meanwhile required cooling rate of pristine PPR is smaller than that of PPR containing β nucleating agent to get the same crystallinity, which shows that the addition of β nucleating agent can decrease the crystallization rate of PPR.

关 键 词：无规共聚聚丙烯 非等温绩量动力学 Β成核剂 稀土 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]