UHMWPE/HDPE/PA1012复合材料的制备及性能研究

Preparation and Performance Research of UHMWPE/HDPE/PA1012 Composites

以高密度聚乙烯接枝马来酸酐(HDPE-g-MAH)为相容剂,在双螺杆挤出机上通过原位增容反应制备了超高摩尔质量聚乙烯(UHMWPE)/HDPE/尼龙1012(PA1012)复合材料。固定配比PE(HDPE∶UHMWPE)∶PA1012∶HDPE-g-MAH=50∶50∶7,考察HDPE与UHMWPE的比例对复合材料性能的影响。研究发现随着UHMWPE含量的增加,共混物的拉伸强度逐渐增加,断裂伸长率逐渐减小。维卡软化温度在HDPE∶UHMWPE=60∶40时达到最小值,仅为141℃,高于或低于此配比,维卡软化温度有所提高。复合材料的耐磨性则呈现出先减小后增加的趋势;通过SEM对复合材料的微观形态、结构进行表征,发现随着HDPE与UHMWPE配比的变化,复合材料的基体与分散相发生了反转,从而引起了复合材料性能的改变。

The ultra-high molecular weight polyethylene （UHMWPE） /high density polyethylene （HDPE） /nylon 1012 （PA1012） composites were prepared by in situ reactive compatibilization in a twinscrew extruder with HDPE graft maleic anhydride （HDPE-g-MAH） as the compatilizer. With the fixed proportion of PE （HDPE/UHMWPE） ： PA1012 ： HDPE-g-MAH of 50 ： 50 ： 7, the effect of the ratio variation of HDPE to UHMWPE on the composites＇ properties was researched. The results showed that with the increase of UHMWPE content, the tensile strength of the blend increases gradually and the elongation at break decreases gradually. The Vicat softening temperature of the composites reached the minimum value of only 141 ℃ when the ratio of HDPE to UHMWPE is 60 ： 40. The abrasion resistance of the composites shows the trend of reducing first and increasing then, The microscopic morphology and structure of the composites were characterized by scanning electron microscope. And the results indicate that with the changing ratio of HDPE to UHMWPE, the matrix and the dispersed phase of the composites inverses, leading to the changes of composites performance.