剑麻纤维增强聚丙烯复合材料的制备与性能研究

摘要

采用动态保压注塑成型技术(DPIM),通过在熔融共混体系中施加往复的剪切应力以改善剑麻纤维(SF)与聚丙烯(PP)复合材料的结构与性能.力学性能测试表明:动态保压获得的样品,拉伸强度与模量获得大幅度提高,但样品冲击性能有所下降.当剑麻纤维质量分数为30％时,动态复合材料的拉伸强度提高了23％.DSC结果表明:由于剑麻纤维充当了结晶成核点的作用,使得复合物的结晶温度提高.%Through a dynamic packing injection molding technology (DPIM),imposed the back and forth action of the shear stress on the melt blending system,the injection products' structure and properties of the sisal fiber (SF)/polypropylene (PP) composites were improved.The mechanical properties test showed that the tensile strength and modulus of the DPIM product increased,but the impact strength decreased.Addition of 30％ SF caused an increase of 23％ in tensile strength of the dynamic composite.Moreover,the DSC showed the crystallization temperature of composite was improved,due to the sisal fibers acting as the heterogeneously nucleating points.