PTFE原位成纤对PP/MWCNTs/PTFE复合材料发泡性能和力学性能的影响

Effects of PTFE in-situ fibrillation on the foaming and mechanical properties of PP/MWCNTs/PTFE composites

采用共混造粒和微孔发泡注塑成型工艺,制备了聚四氟乙烯(PTFE)原位成纤增强的聚丙烯/多壁碳纳米管/聚四氟乙烯(PP/MWCNTs/PTFE)微孔复合材料,并对其结晶、流变、微孔发泡和力学性能进行了测试和表征。结果表明:与不加PTFE的PP/MWCNTs复合材料相比,PTFE的加入可以提高PP/MWCNTs/PTFE复合材料的结晶度,增大储能模量,降低损耗因子;PTFE的加入可以改善PP/MWCNTs/PTFE复合材料的泡孔结构,使泡孔密度增大,泡孔直径减小;相比PP/MWCNTs复合材料,当PFTE的加入量为1%(质量分数)时,PP/MWCNTs/PTFE复合材料的断裂伸长率提高了67.5%,抗拉强度提高了21.1%,杨氏模量提高了12.5%。

Polytetrafluoroethylene (PTFE) in-situ fiber-reinforced polypropylene/multi-walled carbon nanotubes/polytetrafluoroethylene (PP/MWCNTs/PTFE) microcellular composites have been prepared by blending granulation and microcellular foaming injection molding. The crystallization, rheology, microcellular foaming and mechanical properties of the composites were investigated. The results show that the addition of PTFE to PP/MWCNTs composites can improve the crystallinity, increase the storage modulus and reduce the loss factor of the materials. The addition of PTFE can improve the cell structure of PP/MWCNTs/PTFE composites, increase the cell density and decrease the cell diameter. Compared with PP/MWCNTs composites, when the addition amount of PFTE was 1% (mass fraction), the elongation at break of PP/MWCNTs/PTFE composites increased by 67.5%, the tensile strength increased by 21.1%, and the Young's modulus increased by 12.5%.