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在聚丙烯(PP)中添加CaCO_3进行填充改性,研究了不同含量、不同颗粒级配的CaCO_3,对复合材料(PP/CaCO_3)力学性能和缺口冲击断面形貌以及流变性能的影响,并采用偏光显微镜(PLM)、广角X射线衍射仪(WAXD)、扫描电镜(SEM),对PP/CaCO_3的结晶形态进行表征。结果表明,在微米CaCO_3(m-CaCO_3)和纳米CaCO_3(n-CaCO_3)的复配比例m(m-CaCO_3)∶m(n-CaCO_3)=3∶1,且复配CaCO_3(C-CaCO_3)总添加量为25%时,PP/C-CaCO_3的冲击强度达到12.7k J/m~2,比纯PP提高111.67%。PLM以及WAXD分析表明,在一定程度上,n-CaCO_3有β成核剂的作用,加快了PP结晶速率,并使球晶细化,有利于PP/CaCO_3的增韧。
The effect of CaCO3 on the mechanical properties, notch impact morphology and rheological properties of PP / CaCO3 composites was investigated by adding CaCO3 to PP. The crystalline morphology of PP / CaCO_3 was characterized by polarized light microscopy (PLM), wide angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM). The results showed that when the molar ratio of m (m-CaCO 3): m (n-CaCO 3) = 3:1 and the molar ratio of CaCO 3 (C-CaCO 3) The impact strength of PP / C-CaCO_3 reached 12.7k J / m ~ 2 when the total addition was 25%, which was 111.67% higher than pure PP. PLM and WAXD analysis showed that, to a certain extent, n-CaCO 3 has the function of β nucleating agent, accelerating the crystallization rate of PP and refining the spherulites, which is beneficial to the toughening of PP / CaCO 3.