国产T800碳纤维/双马来酰亚胺复合材料的界面及力学性能

分别采用日本东丽T800H和国产T800碳纤维作为增强体，采用热压罐工艺制备双马来酰亚胺树脂基复合材料。研究了2种碳纤维的表面物理和化学状态，复合材料的微观界面性能及力学性能。结果表明:国产T800碳纤维表面沟槽分布较多，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。同时，国产T800碳纤维表面具有较多的含氧官能团，有利于与基体树脂形成更好的化学结合作用。因此，国产T800碳纤维的界面剪切强度较T800H碳纤维高约27%。国产T800/HT-280复合材料的力学性能均普遍高于T800H/HT-280复合材料，其中，90°拉伸强度高约25%，面内剪切强度、弯曲强度高约12%，层间剪切强度高约7%。 

Interfacial and mechanical properties of domestic T800 carbon fiber/bismaleimide composites

Japan Toray T800H and domestic T800 carbon fibers were used as reinforcements to prepare bismaleim-ide resin matrix composites by autoclave process.Surface physical and chemical states of the two kinds of carbon fi-bers,as well as micro interfacial properties and mechanical properties of the composites were studied.The results show that the domestic T800 carbon fibers can form better physical adhesion with the resin matrix,which have more grooves on the surface and higher surface roughness.Simultaneously,the domestic T800 carbon fibers can form bet-ter chemical adhesion with the resin matrix,as they have more oxygenic functional groups.Hence,the interfacial shear strength of domestic T800 carbon fibers is higher than that of T800H carbon fibers by about 27%.Moreover, the mechanical properties of domestic T800/HT-280 composites are generally higher than those of T800H/HT-280 composites.The 90°tensile strength improves by about 25%,the in-plane shear strength and bending strength im-proves by about 1 2%,and the interlaminar shear strength improves by about 7%.