PP/改性纳米CaCO3复合材料力学性能与断裂形态研究

制备了反应性单体改性纳米CaCO3填充PP复合材料，研究了反应性单体丙烯酸(AA)和苯乙烯(St)在有、无过氧化二异丙苯(DCP)存在下改性纳米CaCO3填充PP复合材料的力学性能，并用扫描电子显微镜(SEM)研究了复合材料弯曲断面的形态。结果表明，PP／改性纳米CaCO3的力学性能优于PP／微米CaCO3的力学性能；在DCP存在下，AA、AA与St混合改性可使PP／纳米CaCO3的拉伸性能和弯曲性能提高，减小拉伸强度随CaCO3含量增加而下降的趋势；并可有效提高纳米CaCO3在基体中的分散性和界面粘结性。

STUDY ON THE MECHANICAL PROPERTIES AND FRACTURE MORPHOLOGY OF PP/NANO-CaCO3 COMPOSITES MODIFIED WITH REACTIVE MONOMER

Polypropylene (PP)/nano-CaCO3 composites modified by reactive monomers were prepared by a twin-screw extruder. With and without DCP, the effect of acrylic acid ( AA) and styrene (St) on the mechanical properties and the fracture morphology were investigated. The investigation results showed that the mechanical properties of PP /nano-CaCO3 composites were higher than that of PP/micro-CaCO3 composites. In the presence of DCP, the modification by AA or by AA and St further increased the tensile properties and flexural properties of PP/nano-CaCO3 composites, and reduced the decreased trend of tensile strength with the increased content of CaCO3 filler. The results of SEM also showed that in the presence of DCP, the modification by AA or by AA and St could effectively improve the dispersion and the interfacial adhesion of nano-CaCO3 in the composites.