PP—g—MMA对PP／W力学性能及等温结晶动力学的影响

用差示扫描量热法（DSC）考察了聚丙烯（PP）、聚丙烯，硅灰石（PP／W）和聚丙烯，聚丙烯-g-甲基丙烯酸甲酯，硅灰石（PP，PP—g—MMA／W）的等温结晶过程。用Avrami方程对上述过程进行分析，n、K、t1/2 tmax、G1，2等参数表明，W和PP—g—MMA的掺入改变了PP的结晶成核和生长机理。用Laurimen—Hoffman异相成核理论对PP球晶的生长速率进行了分析，△E数值表明，W有较强的成核活性，PP—g—MMA的掺入不仅进一步提高其成核活性，同时对PP大分子的扩散起阻碍作用。总之，PP—g—MMA对PP，W复合材料起增容作用，充分发挥了W的增强增韧效果。

Effect of PP-g-MMA on Mechanical Properties and Isothermal Crystallization Kinetics of PP/W

The isothermal crystallization processes of polypropylene （PP）, polypropylene/wollast-onite （PP/W） and polypropylene/polypropylene-g-methyl methacrylate/wollastonite （PP/PP-g-MMA/W） were investigated by DSC. The Avrami equation was used to describe the isothermal crystallization processes of the above systems. The parameter values of n, K, t1/2, tmax, G1/2 indicated that the mechanisms of nucleation and growth of crystallization were changed by mixing wollastonite and PP-g-MMA. The Lauritzen-Hoffman heterogeneous nucleation theory was used to analyze the sphemlitic growth rate of PP. The value of △E showed that the wollastonite had better nucleating activity. The addition of PP-g-MMA in PP/W not only improved the nucleating activity of wollastonite, but also hindered the molecular diffusion of PP. In a word, the PP-g-MMA played an interface eompatiblizer role in PP/W composite and gave full play to the toughening effect of W.