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本文研究了经80℃热水老化4000小时和加速气候老化1200小时的短碳纤维与玻璃纤维混杂增强聚苯硫醚复合材料的力学性能变化,并对复合材料中的纤维长度分布进行了统计。 研究表明,纤维长度减小主要发生在挤出造粒阶段,而且大多数纤维的长度小于临界长度。 混杂纤维增强的聚苯硫醚复合材料的拉伸强度和弯曲强度与混杂纤维比例基本上是线性关系,而冲击强度与混杂纤维比的曲线呈现下凹的趋势。 加速气候老化对PPS损害较热水老化明显。老化后的复合材料力学性能保留率与老化方式和纤维种类有关。弯曲性能受老化影响较小,而拉伸性能受影响较显著。热水老化对玻璃纤维含量高的复合材料影响较显著。
In this paper, the changes of mechanical properties of polyphenylene sulfide (PPS) composites mixed with short carbon fibers and glass fibers accelerated aging at 80 ℃ for 4,000 hours and accelerated weathering for 1,200 hours were studied. The fiber length distribution in the composites was also studied. The research shows that the decrease of fiber length occurs mainly in the extrusion granulation stage, and the length of most fibers is less than the critical length. The tensile strength and flexural strength of hybrid fiber-reinforced polyphenylene sulfide composites are basically linear with the ratio of hybrid fibers, while the curves of impact strength and hybrid fiber ratio show a downward trend. Acceleration of weathering damage on PPS hot water than aging obvious. The mechanical properties retention rate of aged composites is related to the aging mode and fiber types. Bending properties are less affected by aging, while tensile properties are more affected. Hot water aging has a significant impact on the composites with high glass fiber content.