超疏水自潔性質薄膜應用廣泛，其表面能低、水滴接觸角大，利於水珠滾動等特性，使得物體表面不易沾附灰塵髒汙。本論文主題有二，以BA-a polybenzoxazine 超疏水薄膜為主體分別如下分兩部分探討：
(1)以表面具有抗反射性質的奈米草矽基材，塗覆上具超疏水自清潔性質的高分子薄膜，不但有優異的抗反射性質，且能同時保有超疏水自清潔表面性質。
首先以H2電漿蝕刻矽晶圓，使其表面呈微觀奈米草結構；接著以BA-a benzoxazine 高分子與 SiO2 奈米粒子混合，旋轉塗覆在奈米草矽基材結構上，製備出超疏水薄膜。薄膜疏水性依SiO2添加比例增加而提高，而抗反射性質則遞減；結果以大約10:1的高分子與SiO2添加比例的薄膜具超疏水性質同時光線反射率低於10%。
(2)奈米碳管強固耐久、應用層面廣。以奈米碳管為基材製備超疏水薄膜：首先以THF配製10wt%的BA-a benzoxazine塗覆在玻璃片上，接著再將奈米碳管塗覆於其上並加熱使benzoxazine交聯固著奈米碳管。最後以不同濃度之BA-a benzoxazine塗覆在最上層；其BA-a benzoxazine的濃度以10wt%的薄膜疏水性最佳，而耐候性也隨著疏水性增加而提高，且經去離子水浸泡1.5天後其疏水性仍維持不變。

The superhydrophobic self-clean thin film has extensive applications to the industrial ascribed to its excellent water repellency, low droplet sliding angle. In this study, the BA-a polybenzoxazine superhydrophobic thin film as the main theme and discusses in two parts below:
(1)The self-clean polybenzoxazine based thin film coated on nanograss surface-like silicon wafers which possesses both anti-reflective and superhydrophobic properties.
First of all, we demonstrate nanograss surface-like silicon wafers etched by H2 plasma as the substrate, then coated with SiO2 nanoparticles blended BA-a polybenzoxazine thin film subsequently. We found that when the content of SiO2 nanoparticles increased, the hydrophobicity of the film increased consequently, and conversely the anti-reflective of light decreased. As a result, the ratio of BA-a polybenzoxazine and SiO2 nanoparticles as about 10:1 to thin film which possesses superhydrophobic property and the reflectance of light can be lower than 10%.
(2)Carbon nanotubes has excellent durability and extensive applications. We use the carbon nanotubes as substrate to prepare the superhydrophobic film. First, 10wt% of BA-a benzoxazine dissolved in THF and spin-coated on glass slide, then carbon nanotubes spread on it and cured subsequently. The carbon nanotubes fastened on cross-linked polybenzoxazine. Finally, different concentration of BA-a benzoxazine coated on the top. The concentration of BA-a benzoxazine as 10wt% which provided better hydrophobicity. The durability of the film increased by improving its hydrophobicity. When immersing the film in deionized water for 1.5 days, the superhydrophobicity maintained consistent after drying in oven.

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