纳米CaCO3填充聚丙烯的非等温结晶动力学

利用差示扫描量热仪(DSC)研究了未处理纳米CaCO3和经偶联剂处理的纳米CaCO3对聚丙烯非等温结晶行为的影响。结果表明，处理的与未处理的纳米CaCO3粒子在聚丙烯基体中都能起到异相成核作用。但是，与未处理的纳米CaCO3相比，经表面改性的纳米CaCO3粒子能更加有效的提高聚丙烯的结晶温度。研究还发现，当偶联剂用量为纳米复合材料中CaCO3含量的1％～2％(质量)，同时降温速率大于5K／min小于40K／min，相对结晶度要求大于30％时，处理的纳米CaCO3粒子可使聚丙烯的结晶动力学参数Zc有小幅度的增加，F(T)值则显著减小，此结果具有非常重要的实际应用价值。

NONISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE FILLED WITH NANO-CaCO3

The nonisothermal crystallization behaviors of polypropylene filled with non-treated nano-CaCO_3 and treated nano-CaCO_3 were investigated by using differential scanning calorimetry (DSC). The results show that both non-treated nano-CaCO_3 and treated nano-CaCO_3 have the effect of heterogeneous nucleation in crystallization. However, the treated nano-CaCO_3 can increase the temperature of crystallization more effectively. At the same time, it also found that the parameter of the nonisothermal crystallization kinetics Zc enhances slightly and the value of F(T) reduces greatly when the content of coupling agent for the surface treatment of nano-CaCO_3 is about 1%~2%, cooling rate is much more 5 K/min as well as less than 40 K/min, and relative crystallization degree is above 30%.