聚醚改性多面体低聚倍半硅氧烷构筑耐水性亲水防雾涂层

目的制备一种高耐水性的亲水防雾涂层。方法通过光引发巯基-烯点击化学反应,合成聚醚改性多面体低聚倍半硅氧烷(POSS),得到聚醚改性POSS(POSS-SH6-PEGMA2),采用FT-IR、1H-NMR表征合成产物的结构。将其与亲水性UV树脂混合,在聚碳酸酯基板上涂布、光固化,形成高耐水性亲水防雾层。采用X射线光电子能谱仪(XPS)分析涂层表面元素,通过超景深三维显微镜对涂层表面形貌进行分析,使用接触角分析仪表征涂层的亲水性,并评价涂层的耐水性和防雾性能。结果通过XPS得到的结果表明,POSS在涂层中发生迁移,富集在涂层表面。通过超景深三维显微镜观察涂层表面发现,表面产生了一系列不同的微观结构,表面粗糙度增大。随涂层中POSS-SH6-PEGMA2的含量增大,涂层的耐水性、亲水性以及防雾性能增强。当POSS-SH6-PEGMA2的含量为55%时(POSS含量为9.71%),涂层的耐水性(吸水率为7.3%)、亲水性(水接触角为7.41°±2.35°)和防雾性能最佳。结论在聚乙二醇二丙烯酸酯涂层中添加一定量聚醚改性POSS(POSS-SH6-PEGMA2的含量为55%),能获得高耐水性的亲水防雾涂层。

Water Resistant Hydrophilic Anti-fog Coating Constructed by Polyether Modified Polyhedral Oligosilsesquioxanes

The work aims to fabricate a water resistant hydrophilic anti-fog coating. Polyether modified POSS (POSS-SH6- PEGMA2) was prepared by synthesizing polyether polyhedral oligosilsesquioxanes through thiol-ene click chemistry. The structure of the reaction products were characterized by FT-IR and 1H-NMR. Then, the reaction products were mixed with hydrophilic UV resin. The mixture was coated and UV-cured on a cleaned polycarbonate sheet to form a hydrophilic anti-fog coating with high water resistance. The X-ray photoelectron spectroscopy was used to analyze surface elements of the coating. The 3d optical microscope was used to analyze the surface topography of coatings. The contact angle measurement was used to characterize the hydrophilic property of coatings. The water resistance and anti-fog performance were also evaluated. The XPS results indicated that POSS migrated in the coating and enriched on the surface. With the help of the 3D optical microscope, a series of different micro structures were found on the surface, indicating that the surface roughness was increased. The hydrophilic and anti-fog properties and water resistance of the coating were improved with the increase of the content of POSS-SH6-PEGMA2 within a certain range, and the coating had the best water resistance (the water absorption rate was 7.3%), hydrophilic property (the water contact angle was 7.41°±2.35°) and anti-fog performance when the content of POSS-SH6-PEGMA2 was 55% (9.71% POSS). Adding polyether modified POSS into PEGDMA coating (the content of POSS-SH6-PEGMA2 is 55%) can obtain a hydrophilic and anti-fog coating with high water resistance.