【摘要】 研究了增容剂聚丙烯接枝马来酸酐(PP-g-MAH)和稀土β成核剂对聚丙烯/硫酸钙晶须复合材料的结晶行为、熔融行为和力学性能的影响。实验结果表明,硫酸钙晶须具有一定的诱导β-晶型的异相成核作用,使聚丙烯结晶温度提高和结晶速率增加。PP-g-MAH提高了结晶温度和晶须的成核能力,降低了β-晶型的含量,不利于β-晶型的生成,并改善了树脂与晶须的界面性能,提高了拉伸强度和冲击性能。稀土β成核剂具有很强的诱导形成β-晶型的异相成核效应,有效地提高了复合材料的冲击性能。更多还原

【Abstract】 Effects of compatibilizer PP-g-MAH and rare earth β-phase nucleating agent on crystallization and melting behavior and mechanical properties of polypropylene/calcium sulfate whisker composites were investigated. It was found that the calcium sulfate whisker had a heterogeneous nucleation effect on the polymer matrix and induced the formation of β-crystal, increasing the peak crystallization temperature and the overall rate of crystallization of PP. PP-g-MAH improved the interfacial compatibility and tensile strength, enhanced the nucleation activity of the whisker in the PP matrix, and increased the content of β-PP. The results showed that rare earth β-phase nucleating agent resulted in dominant β-PP and improved effectively the impact strength.更多还原