碳纤维/乙烯基酯树脂拉挤复合材料界面性能研究

对PAN基碳纤维在线热氧化表面处理,分析了处理前后碳纤维的表面形貌,通过拉挤成型工艺制备出碳纤维/乙烯基酯树脂复合材料。对拉挤复合材料的微观结构观察以及力学性能测试表明:碳纤维经表面处理后表面粗糙度增加,与乙烯基酯树脂的界面粘结性明显改善,复合材料的力学性能尤其是层间剪切强度得到显著提高。对不同界面性能的碳纤维复合材料进行动态热机械分析(DMTA),认为界面性能的改善可降低损耗模量,提高复合材料的耐疲劳性能。

STUDY ON THE INTERFACIAL PROPERTIES OF PULTRUDED CARBON FIBER/VINYL ESTER RESIN COMPOSITES

In this work, the composites consisting of continuous PAN-based carbon fibers and vinyl ester resins were fabricated by pultrusion processing, in which on-line surface treatment on the carbon fibers by thermal oxidization was carried out. The microstructures of the surfaces of both treated and untreated carbon fibers and the fracture morphologies of the composites were analyzed by using SEM. Also, the quasi-static mechanical properties and the thermodynamic mechanical properties of the composites were measured with Universal Materials Tester and Dynamic Mechanical Thermal Analyzer (DMTA), respectively. The results show that the surface roughness of the carbon fibers increases by the surface treatment, and thus the interfacial adhesion between the carbon fibers and the vinyl ester resins rises, and the mechanical properties, especially the Interlaminar Shear Strength (ILSS), of the composites are obviously improved. Moreover, according to the thermodynamic mechanical properties of the composites, it is found that the improvement of interface properties causes the loss modulus reduced, and can increase the fatigue resistance of the composites.