【摘要】 采用差示扫描量热法 (DSC)对插层聚合法制备的聚丙烯 /蒙脱土纳米复合材料 (PP MMT)的等温结晶过程进行了研究 .引入蒙脱土 (MMT)后 ,PP MMT的结晶速率大幅度提高 ,相对结晶度略有下降 .采用Avrami方程对结晶动力学进行研究 ,Avrami指数n≈ 3 .0 ,半结晶时间t1 2 大幅度降低 .采用Hoffman理论计算了PP MMT的球晶生长的单位面积表面自由能σe,结果表明σe 随MMT含量的增加逐渐降低更多还原

【Abstract】 The isothermal crystallization kinetics of intercalatively polymerized polypropylene/montmorillonite (PP/MMT) nanocomposites and isotactic polypropylene (PP) was investigated by differential scanning calorimetry (DSC).The relative crystallization degree of PP/MMT nanocomposites was decreased slightly after introducing montmorillonite.The isothermal crystallization process was described by the Avrami equation with exponent n ≈2.4 for pure PP and n ≈3.0 for PP/MMT nanocomposites.The half crystallization time ( t 1/2 ) of PP/MMT was much shorter than that of pure PP.The σ e,interfacial free energy per unit area perpendicular to PP chains,of PP/MMT nanocomposites was calculated by Hoffman theory.The result showed that the σ e was decreased with increasing the MMT content.更多还原