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用电沉积方法将含羧基的共聚物沉积于碳纤维表面后,可以使单向碳纤维增强环氧的层间剪切强度从未处理时的650kg/cm~2提高到1000kg/cm~2以上,用扫描电子显微镜观察剪切断口,得到与强度数据一致的破坏模式,表明电沉积层的界面粘合作用提高了纤维-树脂基体界面传递应力的能力,改变了界面附近裂缝的形成和扩展。已有数据还表明,此法在提高层间剪切强度的同时,并不削弱其它力学性能。用红外光谱等实验初步证实了电沉积过程的负离子——自由基机理,观测到沉积层在纤维表面的附着情况。
After the carboxyl group-containing copolymer is deposited on the surface of the carbon fiber by electrodeposition, the interlaminar shear strength of the unidirectional carbon fiber-reinforced epoxy can be increased from 650 kg / cm 2 to 1000 kg / cm 2 or higher without treatment, Scanning electron microscope (SEM) was used to observe the shear fracture, and the failure mode consistent with the intensity data was obtained. The results showed that the interfacial adhesion of the electrodeposited layer improved the ability of stress transfer at the fiber-resin matrix interface and changed the formation and propagation of cracks near the interface. The available data also show that this method does not weaken other mechanical properties while increasing the interlaminar shear strength. Experiments with infrared spectroscopy and other experiments preliminary confirmed the negative ion-free radical mechanism of the electrodeposition process, observed the deposited layer on the fiber surface adhesion.