碳纤维/聚丙烯/聚乳酸增强复合材料的力学性能

为在不改变碳纤维/聚丙烯(PP)复合材料力学性能前提下,降低复合材料中PP含量以减轻环境降解压力,通过在碳纤维/PP复合材料树脂体系中掺杂可降解的聚乳酸(PLA)形成共混树脂体系,并经热压成型制备碳纤维增强共混树脂复合材料。探究了PLA、PP共混体系质量比对复合材料冲击、弯曲和拉伸性能的影响。结果表明:随着树脂体系中PLA质量分数的增加,复合材料的冲击强度和弯曲强度都呈先降低后升高、再降低的趋势,拉伸强度呈现先升高后降低的趋势;当PLA质量分数为60%时,复合材料的冲击强度和弯曲强度最高,分别为21.8 k J/m²和112.5 MPa,拉伸强度为37.2 MPa,复合材料的综合物理力学性能最优,与未添加PLA的复合材料的力学性能相近。

Mechanical properties of carbon fiber/polypropylene/polylactic acid reinforced composites

In order to reduce the content of polypropylene (PP) in carbon fiber/PP composites and reduce the environmental degradation pressure without changing the mechanical properties of carbon fiber/PP composites, the carbon fiber/PP composite resin system was doped with degradable polylactic acid (PLA) to form a blended resin system, and the carbon fiber reinforced blended resin composites were prepared by hot pressing. The effects of the mass ratio of PLA toPP blends on the impact, bending and tensile properties of the composites were investigated. The results show that with the increase of mass fraction of PLA in resin system, the impact and bending strength of carbon fiber composites decrease first and then increase, while the tensile strength increases first and then decreases. When the PLA mass fraction is 60%, the impact strength and flexural strength of the composites are the highest at 21.8 kJ/m² and 112.5 MPa, and the tensile strength is 37.2 MPa, which has the optimal comprehensive physical and mechanical properties, which is similar to the mechanical properties of the composites without PLA.