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采用超临界CO2作为增塑剂,与聚丙烯(PP)结合对超高分子量聚乙烯(UHMWPE)进行挤出共混,分析超临界CO2对其性能的影响。结果表明:随着螺杆转速的增加,共混物的拉伸强度呈下降趋势,冲击强度随着螺杆转速的增加呈现先降低后升高的趋势。有超临界CO2条件下的共混物的力学强度值均高于无超临界条件下的。SEM照片显示,超临界CO2的加入使UHMWPE/PP共混物的界面模糊,相容性增加,且超临界CO2使共混物中出现少量的微孔,从而使制品密度降低但并没有影响其力学性能。DSC表征说明,超临界CO2的加入可以使共混物的结晶度增加。
Supercritical CO2 was used as plasticizer, and UHMWPE was co-extruded with polypropylene (PP) to effect the effect of supercritical CO2 on its performance. The results showed that with the increase of screw speed, the tensile strength of the blends showed a downward trend. The impact strength of the blends decreased first and then increased with the increase of screw speed. The mechanical strength of blends with supercritical CO2 were higher than those without supercritical CO2. The SEM images showed that the addition of supercritical CO2 made the interface of UHMWPE / PP blend fuzzy and the compatibility increased, and the supercritical CO2 caused a small amount of micropores in the blend, which resulted in the decrease of product density without affecting its Mechanical properties. DSC characterization shows that the addition of supercritical CO2 can increase the crystallinity of the blend.