电泳沉积海藻酸钠/碳纳米管修饰高模碳纤维表面

采用纳米材料增加碳纤维（CF）的表面粗糙度及活性官能团，不仅可以改善CF增强复合材料的界面结合状态，而且不会对CF本体造成损伤，是一种极具发展潜力的新型CF表面改性手段。使用电泳沉积技术（EPD）将碳纳米管（CNTs）沉积在高模CF表面，然后与环氧树脂（EP）复合，制备了单向纤维增强层压板（CF/EP复合材料）。使用万能拉力机测试CF/EP复合材料的层间剪切强度（ILSS），结果表明，在电压为6 V时制备的CF/EP复合材料的ILSS为58.9 MPa，与未经EPD处理的CF/EP复合材料（ILSS=52.2 MPa）相比提高了12.8%。同时，通过EPD制备了海藻酸钠与CNTs共沉积修饰的高模CF，海藻酸钠的加入增加了CNTs与CF表面的黏附性及氧含量，提高了纤维表面对树脂基体的浸润性。当CNTs的质量浓度为0.3 mg/mL、海藻酸钠的质量浓度为1 mg/mL、EPD电压为8 V时，所制备的CF/EP复合材料的ILSS可达68.3 MPa，与未经EPD处理的CF/EP复合材料相比提高了30.8%。

Surface modification of high-modulus carbon fibers by electrophoretic deposition of sodium alginate/carbon nanotubes

Increasing the surface roughness and active functional groups of carbon fibers (CF) by deposition of nanomaterials can improve the interface bonding state of CF-reinforced composites without damaging the CF body. This new method of CF surface modification has great development potential. Carbon nanotubes (CNTs) were deposited on the surface of high-modulus CF by electrophoretic deposition (EPD) and then combined with epoxy resin (EP) to prepare unidirectional fiber-reinforced laminates (CF/EP composites). The interlaminar shear strength (ILSS) of CF/EP composites was tested using a universal tensile machine. The ILSS of the CF/EP composite prepared at 6 V was 58.9 MPa, which is 12.8% higher than that of the CF/EP composite without EPD treatment (ILSS=52.2 MPa). High-modulus CF co-deposited with sodium alginate and CNTs was also prepared by EPD. The addition of sodium alginate increased the adhesion and oxygen content of the CNTs and the CF surface and improved the infiltration of the fiber surface and resin matrix. When the mass concentration of CNTs was 0.3 mg/mL, the mass concentration of sodium alginate was 1 mg/mL, and the EPD voltage was 8 V, the ILSS of the prepared CF/EP composite was 68.3 MPa, which is 30.8% higher than that of the CF/EP composite without EPD treatment.