环境恶化与能源危机，使碳纤维复合材料汽车轻量化技术备受重视。然而，由于传统印染不易实现碳纤维的染色，碳纤维及其复合材料通常为单调的黑色，无法满足人们个性化的审美要求。缺乏消费者认可，将不利于推动碳纤维复材轻量化技术的应用。因此，有必要开发一种新技术实现碳纤维的染色，从而制备结构功能一体化的彩色碳纤维复材。受到昆虫薄翅干涉色的启发，本项目拟通过原位化学自组装，在碳纤维表面组装一层聚磷腈薄膜，制备基于单层薄膜干涉的彩色碳纤维，并揭示其生色机理。本项目将重点研究聚磷腈薄膜在碳纤维表面的化学自组装过程对薄膜厚度及结构色的影响，从而实现彩色碳纤维的可控制备；并基于单层薄膜干涉理论，分析结构色波长λ与薄膜厚度d的关系，验证理论波长λ’与实测波长λ的一致性，揭示彩色碳纤维的单层薄膜干涉生色机理。本项目可为碳纤维的染色提供新的方法，将为彩色碳纤维及彩色复合材料的开发与应用提供理论依据，具有重要的研究意义。

Automobile lightweight has caused extensive concern due to the environment deterioration and energy crisis. Carbon fiber (CF) reinforced resin composites are recognized as the perfect material for lightweight. However, it is very difficult to color CF by conventional dyes or pigments, because of its special physical and chemical characters. CF and its related materials usually exhibit a drab black. The tired and unexciting look can not satisfy the consumer demand for the products with beautiful and unique appearance. The development and application of CF composites for automobile lightweight may be greatly limited due to lock of consumer acceptance. Therefore, it becomes very important to research and develop an novel coloration technology to prepare colored CF and, further fabricate the colorful composites with structural and functional performances. Inspired by the thin film interference colors of single transparent wing in the insect world, we intends to carry out the study on structural coloration of carbon fibers according to thin polyphosphazene film interference and its coloration mechanism. More specifically, prepare colored CF by introducing a single-layer transparent polyphosphazene film onto CF surface as structural coloration layer via facile in situ self-assembly. The study will focus on the effects of assembly processes on the thickness of polyphosphazene film and the structural color of CF, thus realizing the controllable and efficient preparation of structurally colored CF. Moreover, we will study the the relationship between polyphosphazene film thickness (d) and the reflective wavelength (λ) of the corresponding structural color, verify the consistency of the theoretical reflective wavelength (λ’) and the experimental reflective wavelength (λ), thus revealing the mechanism of structural coloration based on single thin film interference. The project will provide a new method for preparing colored CF. In all, the project is of great significance to offer theoretical guidance for the further development and application of colorful CF and colorful composites with structural and functional performances.