基于丝胶蛋白的柔性导电薄膜的制备及电学性能研究

Preparation and Electrical Properties of Flexible Conductive Films Based on Sericin Protein

摘要: 目前绿色、低碳、环保已成为时代发展的主题，以蚕丝脱胶废水中提取的丝胶蛋白为原料，并引入壳聚糖，将两者按照一定比例混合后，加入纳米碳粉分散液制成了具有一定力学性能的导电薄膜。采用控制变量法，通过分析丝胶蛋白与壳聚糖的质量共混比、纳米碳粉的质量分数、烘干温度变化对导电薄膜的厚度、导电性、力学性能的影响，综合得到最佳的制备工艺，并对最佳制备工艺下的导电薄膜的柔软性、表面形貌、结构以及电学稳定性进行表征分析。结果表明：最佳工艺下导电薄膜的抗弯刚度小，柔性好，添加纳米碳粉后的丝胶蛋白/壳聚糖复合薄膜成形良好，内部分布均匀；在拉伸不同时间以及多次弯折后，导电薄膜的电阻有一定的变化，但总体上变化不明显，说明柔性导电膜具有一定的电学稳定性，这为导电薄膜在柔性传感器和智能可穿戴领域的应用提供了一定的借鉴。

Abstract: At present, green, low-carbon, and environmental protection have become the theme of the development of the times. Sericin protein extracted from silk degumming wastewater was used as raw material, which were mixed with chitosan in a certain proportion. After adding nano carbon powder dispersion, a conductive film with certain mechanical properties was made. By using the control variable method, the optimal preparation process was obtained by analyzing the mass ratio of sericin protein to chitosan, the mass fraction of nano carbon powder, and the influence of drying temperature changes on the thickness, conductivity, and mechanical properties of the conductive film. The softness, surface morphology, structure, and electrical stability of the conductive film under the optimal preparation process were also characterized and analyzed. The results show that under the optimal process, the conductive film has low bending stiffness and good flexibility. The composite film with the addition of nano carbon powder has good formation and uniform internal distribution; after stretching for different times and multiple bends, the resistance of the conductive film varies to some extent, but the overall change is not significant, indicating that the flexible conductive film has a certain degree of electrical stability. This provides a certain reference for the application of conductive film in the fields of flexible sensors and intelligent wearables.