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为了研究无机刚性颗粒对通用塑料聚丙烯(PP)的力学性能的影响,采用熔融共混方法制备了经硅烷偶联剂A-151处理的SiO2/PP复合材料,并通过其缺口冲击、拉伸、弯曲试验和冲击断面的形貌观察,分析研究了微纳米SiO2颗粒大小、填充量、表面改性以及不同颗粒大小SiO2混合物对PP复合材料增韧、增强效果的影响。实验结果表明:纳米SiO2的加入可以同时改善其韧性、刚性和强度;填充量相同,颗粒越细,SiO2/PP复合材料的力学性能越好。SiO2经改性后填充到PP基体中,明显改善了颗粒在基体中的分散性及基体与颗粒之间界面结合性能,使复合材料的综合力学性能得到提高。不同颗粒大小的SiO2混合后填充到PP基体中,混合SiO2的协同效应使复合材料拉伸、弯曲性能进一步提高,对PP基体具有更好的增强效果,但其冲击性能下降。
In order to study the influence of inorganic rigid particles on the mechanical properties of general purpose plastic polypropylene (PP), SiO2 / PP composites treated with silane coupling agent A-151 were prepared by melt blending method and through its notched impact, , Bending test and the morphology of the impact cross section. The effects of the particle size, filling amount, surface modification and SiO2 mixtures with different particle size on the toughening and strengthening effect of PP composites were studied. The experimental results show that the addition of nano-SiO2 can improve the toughness, rigidity and strength of SiO2 / PP composites at the same time. After being modified, SiO2 is filled into the PP matrix, the dispersibility of the particles in the matrix and the interface bonding performance between the matrix and the particles are obviously improved, and the comprehensive mechanical properties of the composite are improved. SiO2 mixed with different particle size was filled into the PP matrix. The synergistic effect of the mixed SiO2 enhanced the tensile and flexural properties of the composite and enhanced the PP matrix with better impact properties.