纳米CaCO3和POE增韧废旧PP复合材料的研究

采用了纳米CaCO3和乙烯-辛烯共聚物（POE）对废旧聚丙烯（PP）进行增韧改性，借助于力学性能测试、SEM和偏光显微镜等观察手段对这一共混体系的增韧机理进行了研究。结果表明，纳米CaCO3和POE对废旧PP具有良好的增韧作用，两者有协同增韧效果；POE对废旧PP的增韧符合剪切屈服理论，纳米CaCO3的增韧机理是诱导PP产生大量的裂纹，形成空穴群，吸收冲击能；废旧PP／POE／纳米CaCO3复合材料的球晶尺寸细化，球晶边界模糊，非晶区域增大，材料的韧性明显提高。

Study on Waste PP Composites Toughened by Nano-meter CaCO3 and POE

Nano-meter CaCO3 and POE were used to improve the toughness of waste PP composites. The toughening mechanism of the composite was investigated by means of testing the mechanical properties of the composites, SEM and polarizing microscope. The results showed both the nano-meter CaCO3 and POE had comparatively good toughening effects on the composites, and had synergistic toughening effects. The toughening mechanism by POE accorded with the sheafing yield theory, and that by nano-meter CaCO3 was to induce PP to bring out a mass of cracks, forming the hollow group to absorb a large amount of impact energy. The crystallization spherulite size of the waste PP/POE/nano-meter CaCO3 composites decreased rapidly, the crystal structure had fuzzy boundaries, noncrystal region increased, and the toughness of the composites was improved obviously.