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在共混挤出聚丙烯(PP)/滑石粉复合材料过程中,通入二氧化碳以辅助加工并由此保护滑石粉的微观片状结构。研究了超临界二氧化碳(SC-CO2)通气量、加工温度、螺杆转速对滑石粉微观片状结构形貌和复合材料性能的影响。结果表明:CO2通气量越大、加工温度越高,加工过程中滑石粉的微观片状结构被破坏程度越小;螺杆转速越高,滑石粉的微观片状结构被破坏程度越大;微观片状结构破坏程度较小的滑石粉,其PP/滑石粉复合材料的拉伸模量和弯曲模量较高。
During the blending of the extruded polypropylene (PP) / talc composites, carbon dioxide is passed in to aid processing and thereby protect the microscopic sheet-like structure of the talc. The effects of supercritical carbon dioxide (SC-CO2) aeration volume, processing temperature and screw speed on the microstructure and morphology of the composite were investigated. The results show that the larger the CO2 aeration, the higher the processing temperature is, the less damage the microstructure of talcum powder in the process is. The higher the screw rotation speed is, the more damage the microstructure of talcum powder is. Talc with less damage to the structure has higher tensile modulus and flexural modulus of PP / talc composites.