A kind of silicone rubber (SR)/carbon fiber (CF)@polydopamine (PDA) flexible composites were prepared in this work. CF was modified by oxidative self-polymerization of dopamine (DA), and the effect of DA concentration on properties of SR/CF@PDA composites was researched. The transverse fiber bundle tests have shown that SR/CF@PDA-1.5 has the best interfacial bonding performance. Compared with SR/CF, tensile strength and elongation at break of SR/CF@PDA-1.5 were increased by 61.7% and 68.4%, respectively. Results indicate that the interfacial bonding of SR/CF@PDA composites was effectively improved due to the adhesion properties of PDA. Moreover, the rough surface of CF@PDA also enhanced the interface interaction through physical “interlocking.” When being compared to other surface modification process, dopamine-modified carbon fiber is cost effective, “green” and highly efficient. SR/CF@PDA with an excellent interfacial bonding and flexibility is a kind of wrapping material for protection of special precision instruments.

中文翻译：

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提高多巴胺改性硅橡胶/碳纤维的界面结合强度

本工作制备了一种硅橡胶（SR）/碳纤维（CF）@聚多巴胺（PDA）柔性复合材料。通过多巴胺（DA）的氧化自聚合对CF进行改性，研究了DA浓度对SR/CF@PDA复合材料性能的影响。横向纤维束测试表明，SR/CF@PDA-1.5的界面结合性能最好。与SR/CF相比，SR/CF@PDA-1.5的拉伸强度和断裂伸长率分别提高了61.7%和68.4%。结果表明，由于PDA的粘附性能，SR/CF@PDA复合材料的界面结合得到有效改善。此外，CF@PDA 的粗糙表面还通过物理“互锁”增强了界面交互。与其他表面改性工艺相比，多巴胺改性碳纤维具有成本效益、“绿色”和高效。SR/CF@PDA具有优异的界面结合力和柔韧性，是一种保护特殊精密仪器的包裹材料。