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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Lauritzen-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。
Polypropylene (PP), polypropylene / wollastonite (PP / W) and polypropylene / polypropylene-g-methylmethacrylate / wollastonite were evaluated by differential scanning calorimetry (DSC) PP-g-MMA / W) isothermal crystallization process. The Avrami equation was used to analyze the above process. The parameters n, K, t1 / 2, tmax and G1 / 2 showed that the incorporation of W and PP-g-MMA changed the crystallization nucleation and growth mechanism of PP. The growth rate of PP spherulites was analyzed by Lauritzen-Hoffman heterogeneous nucleation theory. The △ E values indicated that W had a strong nucleation activity. The incorporation of PP-g-MMA not only further enhanced its nucleation activity, At the same time the proliferation of PP macromolecules play a hindrance. In a word, PP-g-MMA can compatibilize the PP / W composite and give full play to the strengthening and toughening effect of W.