采用热压-喷涂法制备PMMA超疏表面涂层

Fabrication of PMMA Superhydrophobic Surface Coating by Hot Embossing/Spray Method

以纳米SiO2和PMMA为原料,提出了一种以不锈钢丝网为热压模板结合喷涂法制备PMMA超疏表面的新方法.研究了热压压力和喷涂SiO2纳米粒子浓度对表面浸润性的影响.结果表明,SiO2纳米粒子能够明显改善PMMA表面的浸润性.在热压压力为0.5MPa、疏水性SiO2纳米粒子质量分数为4%时,可获得最佳的超疏水涂层,涂层的接触角为164°±0.8°,滚动角小于2°.通过扫描电镜（SEM）观察了涂层表面的微观结构,发现超疏水性涂层具备规则的微纳二元结构.该表面在p H值为114的范围内都具有很好的超疏性能;同时,制备的超疏水涂层在空气中放置10个月以上,其表面接触角仍大于150°.

A new method to prepare PMMA superhydrophobic surface with SiO2 nanoparticles and PMMA as raw materials was proposed,in which stainless steel mesh was used as the template and spraying was adopted. Effects of the hot embossing pressure and the contents of SiO2 nanoparticles on the superhydrophobic properties of the coating were investigated. Results indicate that SiO2 nanoparticles can remarkably improve the wettability of PMMA surface. When the pressure of hot embossing is 0.5,MPa and the mass percentage of SiO2 nanoparticles is 4%,the composite coating has a high water contact angle of 164°±0.8°and a small sliding angle of less than 2°. The surface morphology of the coatings was investigated using scanning electron microscopy(SEM)and was proved to be a regular 2D micron-ano structure. The surface coatings show high superdrophobic properties for all solutions with pH ranging from1 to 14. Moreover,the contact angles are still larger than 150°after the fabricated superhydrophobic surface has been placed in the air for 10 months.