高相对分子质量成核剂改性聚丙烯的非等温结晶动力学和力学性能研究

采用差示扫描量热仪(DSC)研究了高相对分子质量成核剂（PNA）改性聚丙烯( PP)在不同的降温速率下的非等温结晶动力学，并使用电子万能试验机测定了PP和PNA改性PP的力学系能。用修正Avrami 方程的Jeziorny 法来处理PNA改性PP 的非等温结晶行为。结果表明，在各个降温速率下，PNA的加入都能够明显降低PP相对结晶度达到50%的时间（t1/2），加入0.3份PNA的PP与纯PP相比，其t1/2仅为纯PP的64.9 %，加入PNA后，结晶动力学常数( Zc ) 增加,结晶速率增加; PP的n值随着降温速率的增加而降低，而加入PNA后，n值随着降温速率的增加而升高,加入PNA后，PP的拉伸强度和冲击强度能够同时提高。

Study on Mechanical Property and Non-isothermal Crystallization Kinetics of High Relative Molecular Mass Nucleating Agent Modified Polypropylene

Non-isot hermal crystallization behavior of polypropylene and high relative molecular mass nucleating agent(PNA) modified polypropylene was studied using differential scanning calorimet ry (DSC) with the data analyzed with Jeziorny method.Mechanical property of polypropylene and PNA modified polypropylene was studied using electronic universal testing machines. It showed that PNA increased the crystallization rate of PP , indicated by decreased t1/ 2 and increased Zc . t1/ 2 of polypropylene with 0.3 phr PNA decreased to 64.9 % than t1/ 2 of polypropylene. n of polypropylene decreased with cooling rate increased , and n of PNA modified polypropylene increased with cooling rate increased, tensile strength and impact strength of PNA modified polypropylene were higher than polyprolylene.