C／C复合材料表面聚多巴胺涂层的制备及性能研究

目的：碳／碳（ C／C）复合材料为当前极具潜力的骨修复生物材料，在其表面制备聚多巴胺涂层旨在改善C／C复合材料亲水性和生物活性。方法制备一系列不同涂覆时间、涂覆环境（空气或富氧）条件的C／C复合材料表面聚多巴胺涂层，采用水接触角测试、扫描电子显微镜、能谱分析、原子力显微镜及蛋白吸附等表征手段探索不同制备条件对各项性能的影响规律，得出较佳制备条件。结果反应条件为多巴胺浓度2．0 g／L，涂覆时间30 min（氧气）＋11．5 h（空气）时，聚多巴胺涂层水接触角由空白对照组的64．0°下降至25．9°，其亲水性得到极大的改善；通过扫描电子显微镜、能谱分析及原子力显微镜测试得出该涂层均匀且致密；同时蛋白吸附含量为0．2817 mg。结论在C／C复合材料表面制备了聚多巴胺涂层，极大地改善了C／C复合材料的亲水性和生物活性。这一结果提示聚多巴胺涂层的C／C复合材料可作为新一代骨组织修复材料，为后续医学应用提供了理论依据。

Preparation and properties of polydopamine coating on the surface of C/C composites

Objective Carbon/carbon ( C/C) composites are a potential material for bone repair .To improve the hydrophilicity and biological activity of C/C composites , polydopamine coating was prepared on the surface of C /C composites.Methods By changing the coating time and coating environment ( oxygen or air atmosphere ), a series of polydopamine coating samples were prepared . The water contact angle test , scanning electron microscope , energy dispersive spectrometer , atomic force microscope and protein adsorption test were used to characterize the properties of different samples.Then, the data were analyzed to optimize preparation conditions .Results When the concentration of dopamine was 2.0 g/L,and the coating time was 30 min (oxygen atmosphere) +11.5 h (air atmosphere), the water contact angle was decreased from 64.0°(blank sample) to 25.9°, suggesting that the hydrophilicity was improved greatly . The results of the scanning electron microscope , energy dispersive spectrometer and atomic force microscope showed that the coating was uniform and dense .The amount of protein adsorption per sample was 0.2817 mg.Conclusion The polydopamine coating on the C/C composites improves its hydrophilicity and biological activity , which indicates that the polydopamine coated C/C composites will be a new potential material for bone tissue repair .