PP/纳米SiO2复合材料的非等温结晶动力学

采用差示扫描量热法研究了聚丙烯（PP）/纳米SiO2复合材料的非等温结晶动力学，研究了纳米粒子的成核活性及复合材料的结晶有效能垒。研究结果表明，纳米SiO2起到异相成核的作用，使PP的结晶峰温升高，结晶总速率增大；增容剂马来酸酐接枝聚丙烯(PP-g-MAH)提高了纳米SiO2的成核活性；添加纳米SiO2使复合材料的结晶有效能垒降低，PP-g-MAH使复合材料的结晶有效能垒增大，但低于纯PP的结晶有效能垒。

Nonisothermal Crystallization Kinetics of Polypropylene/Nano-SiO2 Composites

The nonisothermal crystallization kinetics of PP/nano-SiO2 composites was studied uisng differential scanning calorimetry (DSC), the nucleation activity of silica nanoparticles in the polymer matrix and the effective energy barrier for nonisothermal crystallization were explored. Results showed that the nano-SiO2 had a heterogeneous nucleation effect on the polymer matrix, increasing the peak crystallization temperature and the overall rate of crystallization of PP. PP-g-MAH enhanced the nucleation activity of the silica nanoparticles in the PP matrix. Nano-SiO2 decreased the effective energy barrier of PP, the addition of PP-g-MAH in PP/SiO2 increased the effective energy barrier of the composites, but lower than that of neat PP.