PP-g-MMA对PP/W力学性能和非等温结晶的影响

Abstract

考察了增容剂聚丙烯接枝甲基丙烯酸甲酯(PP-g-MMA)对聚丙烯/硅灰石(PP/W)复合材料力学性能和非等温结晶行为的影响。用AVrAMI、OzA-WA、MO、dObrEVA、kISSIngEr等方法对非等温结晶的数据进行分析:ΔgCA、ε、n、α参数表明,W自身有较强的异相成核活性,且会改变PP的结晶成核和生长机理;kC、T1/2、f(T)、TP、XC参数表明,W的填充和PP-g-MMA的掺入,均会提高PP的结晶速率;ΔE和ε表明,W还起着阻碍PP大分子链或链段运动的作用,而PP-g-MMA则会进一步增强这种阻碍作用。由于PP-g-MMA的掺入,PP/W复合材料的刚性、强度和韧性均得以提高。

The influence of compatibilizing agent,polypropylene grafted methyl methacrylate (PP-g-MMA),on the mechanical properties and the nonisothermal crystallization of polypropylene/wollastonite (PP/W) system were investigated.The nonisothermal crystallization data was analyzed using Avrami,Ozawa,Mo,Dobreva and Kissinger methods.The parameter values of ΔGac,ε,n,α indicate that the wollastonite has better nucleating activity,the mechanisms of nucleation and growth of crystallization are changed by mixing wollastonite and PP-g-MMA.The values of Kc,t1/2,F(T),Tp,Xc show that the crystallization rate of polypropylene is increased by adding wollastonite and PP-g-MMA.The values of ΔE,ε reveal that the movement of the chain segments of PP macromolecule is impeded by filling wollastonite,and enhanced by adding PP-g-MMA.Simultaneously,the stiffness、strength and toughness of PP/W composite are improved by adding PP-g-MMA.