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利用原子力显微镜和透射电镜分析了聚苯乙烯辐射接枝纳米二氧化硅粒子(SiO2-g-PS)填充聚丙烯(PP)的微观结构,并与该复合材料的拉伸和冲击强度相关联,为探讨纳米粒子的增强增韧作用机制提供了直观证据。利用原子力显微镜进行的微划痕和纳米压痕实验,通过与显微硬度和动态力学性能测试结果的比较,证实了接枝改性后的纳米粒子团聚体具有承载能力,而这些团聚体对复合材料的局部和整体力学响应不同,揭示了团聚体增强效应的内在原因,即在纳米粒子团聚体内部以及团聚体之间形成了特定的应力双逾渗结构。
The microstructure of polypropylene (PP) grafted with polystyrene grafted silica nanoparticles (SiO2-g-PS) was analyzed by atomic force microscopy and transmission electron microscopy and correlated with the tensile and impact strength of the composites. It provides visual evidence for exploring the mechanism of enhanced toughening of nanoparticles. Micro-scratch and nano-indentation experiments were carried out by AFM. Comparing with the results of microhardness test and dynamic mechanical test, it was confirmed that the grafted nanoparticles had the bearing capacity. However, The local and global mechanical responses of the materials are different, revealing the inherent reason for the agglomeration enhancement effect, namely, the formation of a specific stress-ductile percolation structure within the nano-particle agglomerates and between agglomerates.