碳纤维与环氧树脂基体形成良好的界面结合是发挥复合材料基本性能的保障,考察3种国产T700级碳纤维,研究树脂黏度对碳纤维浸润性以及界面结合性能的影响。结果表明:由室温升到60℃,树脂体系黏度从1401.9mPa·s降低到102.77mPa·s,碳纤维与树脂的接触角减小,浸润能力增强,从而提高复合材料的界面结合强度,在60℃下制备的复合材料层间剪切强度提高了17.44%。同时纤维表面的沟槽结构能够加强物理机械互锁作用,加强复合材料的界面结合强度。
Excellent interface bond between carbon fiber and epoxy resin matrix is the guarantee of the basic properties of composite material.In this study,the effects of resin viscosity on the wettability and interfacial bonding properties of three domestic T700 grade carbon fibers were studied.The results showed that the viscosity of the resin system decreased from 1401.9mPa·s to 102.77mPa·s when the temperature rose from room temperature to 60℃,the contact angle between carbon fiber and resin decreased,and the wetting ability was improved,which enhanced the bond strength of the composites.The interlaminar shear strength of the composite material prepared at 60℃ increased by 17.44%.Meanwhile,the groove structure on the fiber surface could strengthen the physical and mechanical interlocking effect and enhance the interfacial bonding strength of the composite.
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