PVP塑性界面层对CF/VE复合材料性能的影响

EFFECT OF POLY(VINYL PYRROLIDONE) INTERPHASE ON THE PROPERTIES OF UNIDIRECTIONAL CARBON FIBER/VINYL ESTER RESIN COMPOSITES

用热塑性聚乙烯吡咯烷酮(PVP)对商用炭纤维(CF)表面进行不同的涂覆处理后,制备了炭纤维/乙烯基酯树脂基单向复合材料(CF/VE)。研究了PVP塑性界面层对复合材料的层间剪切强度(ILSS)、弯曲性能、断口形貌及动态热机械性能的影响。结果表明,在炭纤维保持原环氧上胶层的基础上直接涂覆PVP时,复合材料的ILSS和弯曲性能提高,纤维与乙烯基酯树脂基体的粘结性能得到改善;炭纤维脱除原环氧上胶层后涂覆PVP时,复合材料的ILSS和弯曲强度降低,纤维与基体的粘结性能变差;塑性PVP界面层的存在使复合材料的玻璃化转变温度(Tg)和弯曲模量提高,储能模量(E′)和能量损耗增大。

Commercial carbon fibers were surfacecoated with thermoplastic poly(vinyl pyrrolidone)(PVP) by using an inhouse coating process and then used as reinforcement to manufacture unidirectional vinylestermatrix composites. The shortbeam shear and flexural properties of the composites were measured. The effect of PVP interlayer on the flexural fracture morphologies and dynamic mechanical properties of the composites were studied by using SEM and DMTA, respectively. Results show that the interlaminar shear strength (ILSS) and flexural strength of the composites with the coated asreceived carbon fibers as reinforcement have been increased, SEM photographs indicating an improved adhesion. While an opposite result has been obtained from the composites made from the coated desized carbon fibers. The glass transition temperature (Tg), flexural modulus and energy dissipation of the coated composites have been raised because of the existing of PVP interlayer.