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首页> 外文期刊>RSC Advances >Fluorine-free superhydrophobic/hydrophobic polybenzoxazine/TiO2 films with excellent thermal stability and reversible wettability
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Fluorine-free superhydrophobic/hydrophobic polybenzoxazine/TiO2 films with excellent thermal stability and reversible wettability

机译：无氟超疏水/疏水聚苯并恶嗪/ TiO2薄膜，具有出色的热稳定性和可逆润湿性

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摘要

Two important properties are combined: the low surface free energy property of polybenzoxazine (PBZ) and the photo-induced superhydrophilicity property of TiO2. A benzoxazine monomer, synthesized by a one-step method, is incorporated with TiO2. Polybenzoxazine/titanium dioxide (PBZ/TiO2) nanocomposite films are prepared using spin coating and a thermal curing method. As a result, a superhydrophobic PBZ/TiO2 film with the largest water contact angle (CA) of similar to 166 +/- 1 degrees is developed by incorporating a low content of TiO2 (11 wt%, relative to the weight of the benzoxazine monomer) into a PBZ system without any fluorine-containing surface modification agents. The as-prepared superhydrophobic film has good adhesion to glass substrates, and its superhydrophobicity is stable even after heat treatment at 300 degrees C for 1 h and environmentally durable for more than half a year. When the content of TiO2 is increased to 60%, the consequent nanocomposite film exhibits hydrophobicity-superhydrophilicity transitions with a variation of around 125 degrees in water CA upon ultraviolet (UV) exposure-heat treatment cycles. The effects of the content of TiO2 on the surface wettability, morphology and reversibly switchable wettability of the PBZ/TiO2 films are investigated in detail.
机译：结合了两个重要的特性：聚苯并恶嗪（PBZ）的低表面自由能特性和TiO2的光诱导超亲水性。通过一步法合成的苯并恶嗪单体与TiO2结合在一起。聚苯并恶嗪/二氧化钛（PBZ / TiO2）纳米复合薄膜是使用旋涂和热固化方法制备的。结果，通过掺入低含量的TiO2（相对于苯并恶嗪单体的重量为11 wt％），开发了具有最大水接触角（CA）接近166 +/- 1度的超疏水性PBZ / TiO2薄膜）进入没有任何含氟表面改性剂的PBZ系统。所制备的超疏水性膜对玻璃基板具有良好的粘附性，即使在300℃下热处理1小时后，其超疏水性也稳定，并且对环境的耐久性超过半年。当TiO2的含量增加到60％时，随后的纳米复合膜在紫外线（UV）暴露-热处理循环中在水CA中表现出疏水性-超亲水性转变，变化幅度约为125度。详细研究了TiO2含量对PBZ / TiO2薄膜的表面润湿性，形貌和可逆转换润湿性的影响。

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