矿物填料形状对PP复合材料力学性能的影响

Effect of Mineral Filler Shape on Mechanical Properties of PP Composites

矿物填料的形状是决定复合材料力学性能的关键因素之一。本研究以纤维状CaSiO3和颗粒状CaCO3两种不同形状的矿物粉体为填料,以JN-114为改性剂、PP为基体树脂,通过熔融共混法制备复合材料,研究不同形状的矿物填料对PP复合材料力学性能的影响。力学性能检测结果表明,CaSiO3与CaCO3的加入均降低了基体的拉伸和弯曲强度,提高了基体的模量;相比之下,CaSiO3能较好地保持PP基体的拉伸强度与弯曲强度,且明显增强基体的模量,主要归因于CaSiO3有较大的长径比;V形缺口冲击强度则相反,CaCO3对基体增韧效果更为明显。SEM分析结果显示,改性后的CaSiO3与CaCO3在基体中均匀分散,但与PP基体的相容性依然较差。

Mineral shape of the filler is one of the key factors which play a vital role in determining the mechanical properties of the composites.In this study,fibrous CaSiO3 and granular CaCO3 as fillers,titanate coupling JN-114 as modifier and polypropylene as matrix resin were used to prepare composite materials through melt blending method to study the influence of mineral fillers shape on the mechanical properties of PP.The tensile modulus and bending modulus are significantly increased,and the performance of CaSiO3 is better than that of CaCO3.Tensile and flexural strength showed a slight decrease in the values with CaSiO3 showing better performance as compared to CaCO3,which is mainly due to the high aspect ratios of CaSiO3.The reverse was observed in case of V-shape notched impact strength and CaCO3 has more obvious toughening effect on matrix.SEM results indicate that both modified CaCO3 and CaSiO3 are fine dispersed in the PP matrix,whereas the incompatibility issue still exist.