压力诱导流动成型PP的微观结构与力学性能研究

Study on Mechanical Properties and Micromorphology of PP Prepared by Pressure Induced Flow Processing

研究了压力诱导流动成型对聚丙烯的微观结构和力学性能的影响。SEM结果表明,压力诱导流动可以使PP形成微观片层结构,该结构由较软的无定形区相联的交互层叠片层构成。力学性能测试表明该结构可以大幅度提高PP的力学性能:拉伸性能从成型前的33MPa提高到成型后的60MPa;缺口冲击强度由1.72kJ/m2提高到压力诱导流动成型后的30kJ/m2。

The effects of pressure induced flow processing on the micromorphology of PP were studied by means of impact test and SEM experiments. The results of SEM showed the pressure induced flow processing could make PP form micro-flake structure, which was made up of interlocking flake separated by soft amorphous region. The results of mechanical properties test showed the micro-flake structure could greatly improve the mechanical properties of PP： the tensile strength increased from 33 MPa to 60 MPa, and the notched impact strength increased from 1.72 kJ/m^2 to 30 kJ/m^2.