国产T700级碳纤维/双马来酰亚胺树脂复合材料界面性能

分别以日本东丽T700S和国产T700级碳纤维作为增强体,采用热压罐成型工艺制备了双马来酰亚胺树脂基复合材料。对比研究了两种碳纤维表面物理、化学状态以及复合材料的微观界面性能、层间剪切性能。结果表明,国产T700级碳纤维表面沟槽结构分布较多,表面粗糙度较高,有利于与树脂基体形成更好的物理结合作用。虽然两种碳纤维的含氧官能团相当,但国产T700级碳纤维表面元素氧碳比较高,有利于与基体树脂形成更好的化学结合作用,其界面剪切强度较T700S碳纤维复合材料高约14%,复合材料的层间剪切强度高约19%。

Interfacial Properties of Domestic T700 Carbon Fiber/Bismaleimide Composites

Toray T700S and domestic T700 carbon fibers were used as reinforcements to prepare bismaleimide composites by autoclave moulding. Surface physical and chemical states of the carbon fibers, as well as interfacial of the composites and interlaminar shear strength were studied. The results show that the domestic T700 carbon fibers can form better physical adhesion with the resin matrix, which have more grooves on the surface and higher surface roughness than T700S carbon fibers. Although the two kinds of oxygen functional groups of carbon fiber are equivalent, the domestic T700 carbon fibers can form better chemical adhesion with the resin matrix, as they have more oxygenic functional groups than T700S carbon fibers. Hence, the interfacial shear strength of domestic T700 carbon fibers is higher than that of T700S carbon fibers by about 14 ％, and the interlaminar shear strength is higher by about 19％.