长纤混杂增强复合材料注塑成型的微观结构演化

Microstructure Evolution of Injection Molding of Long Hybrid Fiber Reinforced Composites

采用熔体浸渍拉挤工艺(LFT-G)制备长碳纤/玻纤混杂增强聚丙烯(LCF/LGF/PP)复合材料。首先研究了纤维表面处理、微观形貌、界面结合状态对复合材料力学性能的影响,并研究了纤维不同混配比对复合材料力学性能的影响。结果表明,纤维经表面处理,增加了与基体的机械啮合作用,改善了界面结合形貌,提高了复合材料的力学性能。与单一纤维增强复合材料相比,混杂增强纤维更易形成随机取向的三维骨架结构。且碳纤和玻纤混合质量比为2∶1时,其注塑制品获得相对较高的强度、韧性和刚度,同时具有相对较低的成本。

In this paper, hybrid long carbon fiber and long glass fiber reinforced PP （LCFGF/PP） composites were prepared by melt impregnation （LFT-G） process. The influence of the fiber surface treatment, the microstructure, the interface bonding state and different proportion of fiber on the mechanical properties of the composite materials were studied. The experimental results show that after the treatment of the fiber surface, the interaction between the fiber and the matrix is strengthened and the interracial bonding morphology is improved, thus boosting the mechanical properties of the composite materials. Compared with single fiber reinforced composites, the mixed fibers are more likely to form a randomly oriented three- dimensional network structure. When the mix ratio of the carbon fiber to the glass fiber is 2 ： 1, the injection molding product has relatively high strength, toughness and rigidity, and a relatively low cost.