聚酯表面类金刚石薄膜的制备及疏水性能

Preparation and Hydrophobic Properties of Diamond-like Carbon Films on PET Substrates

采用线性离子束技术在PET基材表面制备类金刚石薄膜,分析薄膜结构、性能随离子束电流的演变规律并研究了薄膜润湿特性与表面形貌、结构、表面能的作用关系。结果表明:沉积在PET表面的类金刚石薄膜具有典型的非晶碳膜结构特征,随着离子束电流的增大sp^2/sp^3比值由0.774增加到1.622,薄膜表面的石墨化程度提高;改性后的PET材料接触角从63.51°增大到103.7°。进一步分析发现,疏水性能的提高归因于材料表面能的降低,表面石墨化程度的提高和微-纳结构的形成是表面能降低的根本原因。此外,疏水的PET材料在500~760 nm可见光范围内具有一定的増透效果,透过率达到88.5%以上。用线性离子束沉积碳膜及刻蚀技术能得到合适的微观形貌和表面化学结构,可在保持基体材料透明性的同时提高PET柔性聚合物材料的疏水性能。

In order to achieve hydrophobic properties and good wear resistance of PET materials, diamond-like carbon films were deposited on PET substrates by linear ion beam（LIS） technology with varying ion beam current. The microstructure, morphology and wettability were analyzed, and the relationship between wetting behavior and surface morphology, microstructure, surface energy was investigated. The results show that the deposited diamond-like carbon film is typical amorphous carbon, its sp^2/sp^3 increased from 0.774 to 1.622 with increase of LIS current, which indicated the increased graphitization.Meanwhile, the water contact angle of PET increased from 63.51° to 103.7°. Further analysis found that the hydrophobicity can be attributed to the enhanced graphitization and formation of nano-micro structure,which could result in a decrease of surface energy. In addition, the transmissivity in visible light range of PET could reach to over 88.5%, which showed an enhanced effect within the range of 500~760 nm.Therefore, controlling proper surface morphology and low surface energy by plasma modification technology can effectively improve the hydrophobic properties of flexible polymer materials, while the transparency of PET material was maintained.