短切CF/PEEK复合材料的制备及抗紫外老化性能

Preparation and Ultraviolet Aging Resistance of Chopped CF/PEEK Composites

CF/PEEK复合材料因轻质高强、耐腐蚀抗老化等特点,在各领域中被广泛应用,而其在成型过程中不可避免地会产生边料、废料,因此针对CF/PEEK回收再利用的研究很有意义。由于PEEK熔点高、溶体粘度大等特点,此类材料回收再利用困难,本工作通过添加一定量的PEEK树脂粉末的方法,改善短切预浸料的热压工艺性,通过紫外线加速老化实验,研究紫外老化对复合材料微观形貌、力学性能等的影响,并结合主成分分析法综合评价短切CF/PEEK复合材料的抗紫外老化性能,为热塑性预浸料和热塑性复合材料制品的回收再利用提供参考。研究结果表明:添加了树脂粉末的复合材料表面质量和力学性能得到明显的提高。试样表面的树脂基体在紫外老化作用下会出现粉化开裂并逐渐脱落的现象,在表面形成孔洞、裂纹等缺陷,紫外老化时间越长,复合材料表面受损越严重,力学性能下降越明显。通过主成分分析法得到,树脂添加量对短切CF/PEEK复合材料的抗紫外老化性能影响不大。

CF/PEEK composite is widely used in various fields because of its light weight,high strength,corrosion resistance,aging resistance and other characteristics,and it will inevitably produce leftovers and waste materials in the molding process,so it is very meaningful to study the recycling of CF/PEEK.Due to the high melting point and high viscosity of PEEK solution,it is difficult to recycle and reuse such materials.In this work,by adding a certain amount of PEEK resin powder,the hot-pressing process of short-cut prepreg is improved,and the effect of ultraviolet aging on the micro-morphology and mechanical properties of the composite is studied by ultraviolet accelerated aging test,and the anti-ultraviolet aging performance of chopped CF/PEEK composite is comprehensively evaluated by principal component analysis,It provides a reference for the recycling of thermoplastic prepreg and thermoplastic composite products.The results showed that the surface quality and mechanical properties of the composite with resin powder were significantly improved.The resin matrix on the surface of the sample will appear powdery cracking and gradually fall off under the action of ultraviolet aging,and defects such as holes and cracks will be formed on the surface.The longer the ultraviolet aging time is,the more serious the damage on the surface of the composite is,and the more obvious the decline in mechanical properties is.According to the principal component analysis,the amount of resin added has little effect on the ultraviolet aging resistance of chopped CF/PEEK composites.