超临界CO_2改性UHMWPE/PP共混物性能的研究  

Research on copolymer properties of ultra high molecular weight polyethylene/polypropylene modified by supercritical CO_2

作　　者：谢江波[1] 刘亚青[1] 付一政[1] 

机构地区：[1]中北大学材料科学与工程学院山西省高分子复合材料工程技术研究中心,太原030051

出　　处：《化工新型材料》2008年第4期52-53,72,共3页New Chemical Materials

基　　金：山西省科技攻关项目(编号042061)

摘　　要：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 as a plasticizer combined with polypropylene （PP） were added to ultra high molecular weight polyethylene （UHMWPE） and processed through a twin-screw extruder. The influence of supercritical CO2 was studied. From the results of experiments, supercritical CO2 could improve the processing characteristic of the UHMWPE. In the experiment, the extrusion with supercritical CO2 and without supercritical CO2 were compared. The experimental results showed that： as the screw speed was increased, the tensile strength was decreased. Izod impact strength was decreased at first then increased. And the mechanical properties values of extrusion with supercritical CO2 were higher than the values without supercritical CO2. SEM showed that the interracial interactions were enhanced and the mechanical properties were increased by iniecting the supercritical C2）2. And the density of UHMWPE/PP was reduced but the mechanical properties were not degraded. DSC showed that the crystallinity of UHMWPE/PP was increased after the supercritical CO2 injected.

关 键 词：超临界CO2 超高分子量聚乙烯 聚丙烯 共混 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]