结合石英纤维(QF)界面性能好、压缩性能优异以及高强高模聚酰亚胺(PI)纤维密度低、模量高的优势,通过层间混杂设计制备了一系列PI/QF混杂增强复合材料,讨论了混杂比和铺层结构对复合材料弯曲性能、压缩性能和介电性能的影响。结果表明:与石英纤维增强复合材料相比,聚酰亚胺增强复合材料具有更为优异的弯曲性能和在小应变下的抗压缩变形能力,但是压缩强度方面仍有不足;混杂增强复合材料均表现出优异的介电性能,介电常数在2.95～3.3之间,介电损耗小于8.0×10-3。
A series of polyimide/quartz fiber hybrid reinforced composites were prepared through interlaminar hybrid design,taking into account the advantages of good interface and compression properties of quartz fibers,and low density and high modulus of high-strength and high modulus polyimide fibers.The effects of hybrid ratio and ply structure on the flexural,compression and dielectric properties of the composites were discussed.The results showed that compared with quartz fiber reinforced composites,polyimide fiber reinforced composites possessed superior bending performance and compressive deformation resistance under small strain,but the compressive strength was till insufficient.All the hybrid reinforced composites exhibited excellent dielectric properties,with dielectric constants between 2.95-3.3 and dielectric loss less than 8.0×10-3.
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