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首页> 外文期刊>Journal of Applied Polymer Science >X-ray scattering experiments on sputtered titanium dioxide coatings onto PVDF polymers for self-cleaning applications
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X-ray scattering experiments on sputtered titanium dioxide coatings onto PVDF polymers for self-cleaning applications

机译：用于自清洁应用的PVDF聚合物上溅射的二氧化钛涂层的X射线散射实验

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摘要

The performance of active polymer substrates used in sensor and actuator or tactile display applications can be hindered by the inevitable soiling of their surface. A possible approach to overcome this problem is to deposit a self-cleaning coating onto the polymer surface, taking care that the layer underneath withholds its intrinsic properties. In this work, titanium dioxide, TiO_2, was naturally chosen for coating material due to its inherent photocatalytic properties. Thus, TiO_2 thin films were deposited by reactive magnetron sputtering on poly(vinilydene fluoride) - (PVDF) substrates, in its α- (nonelectroactive) and β- (electroactive) phases. Wide angle x-ray scattering (WAXS) experiments in a synchrotron were performed to monitor the crystalline structure of the polymer substrates upon thin film deposition and also to assess the crystalline structure of the TiO_2 coating at different temperatures. In the WAXS patterns of the coated α-PVDF, the TiO_2 polymorph anatase phase can be distinguished. At the same time, no explicit diffraction peaks for anatase were detected in the coated β-PVDF. Fourier transform infrared spectroscopy evidenced that the chemical structure of PVDF is unaffected by the coating deposition process. These structural results have been correlated with the photocatalytic properties of the TiO_2 coatings.
机译：传感器和致动器或触觉显示器应用中使用的活性聚合物基材的性能可能会因不可避免地弄脏其表面而受到阻碍。解决该问题的一种可能方法是在聚合物表面上沉积自清洁涂层，并注意下面的层保留其固有性能。在这项工作中，由于其固有的光催化性能，自然选择了二氧化钛TiO_2作为涂料。因此，通过反应磁控溅射将TiO_2薄膜沉积在聚（偏二氟乙烯）-（PVDF）的α-（非电活性）和β-（电活性）相中。进行了同步加速器中的广角X射线散射（WAXS）实验，以监测薄膜沉积时聚合物基材的晶体结构，并评估不同温度下TiO_2涂层的晶体结构。在涂覆的α-PVDF的WAXS图案中，可以区分出TiO_2多晶型锐钛矿相。同时，在包被的β-PVDF中未检测到锐钛矿的明确衍射峰。傅立叶变换红外光谱证明PVDF的化学结构不受涂层沉积过程的影响。这些结构结果已与TiO_2涂层的光催化性能相关。

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