Yılmaz Kurtuluş, Gürsoy Mehmet, Karaman Mustafa
Langmuir. 2021 Feb 9;37(5):1941-1947. doi: 10.1021/acs.langmuir.0c03437. Epub 2021 Jan 28.
This study demonstrates the coating of a transparent and robust organic thin film having an excellent hydrophilicity-based antifogging property by an initiated chemical vapor deposition (iCVD) method. iCVD was able to synthesize linear and cross-liked poly(acrylic acid) (PAA) from the vapors of acrylic acid (AA) and ethylene glycol dimethacrylate (EGDMA) using tert-butyl peroxide (TBPO) as an initiator. High deposition rates of up to 35 nm/min were observed at low deposition temperatures. It was possible to control the quantity of comonomers in the as-deposited films by adjusting the partial pressure of the EGDMA cross-linking agent. The effect of the EGDMA partial pressure on chemical structure was studied using Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) techniques. FTIR and XPS spectra of the as-deposited films showed the complete retention of the monomer functionality during iCVD. Hydrophilicities and large-area uniformity of the coatings were revealed using water contact angle measurements. The as-deposited PAA film was the most hydrophilic with a water contact angle (WCA) of 7.0°, while cross-linking with EGDMA increased the WCA values by up to 51.7°. Results of various tests, which were based on exposing the coated surfaces to artificial fog and hot water vapor, showed the excellent antifogging property of the coatings. Films were never fogged upon extensive and long-term exposure (2 months) to humid air.
本研究展示了通过引发化学气相沉积（iCVD）方法制备具有优异亲水性防雾性能的透明且坚固的有机薄膜涂层。iCVD能够以叔丁基过氧化物（TBPO）为引发剂，由丙烯酸（AA）和乙二醇二甲基丙烯酸酯（EGDMA）的蒸汽合成线性和交联的聚丙烯酸（PAA）。在低沉积温度下观察到高达35 nm/min的高沉积速率。通过调节EGDMA交联剂的分压，可以控制沉积薄膜中共聚单体的量。使用傅里叶变换红外（FTIR）和X射线光电子能谱（XPS）技术研究了EGDMA分压对化学结构的影响。沉积薄膜的FTIR和XPS光谱表明在iCVD过程中单体官能团完全保留。通过水接触角测量揭示了涂层的亲水性和大面积均匀性。沉积的PAA薄膜亲水性最强，水接触角（WCA）为7.0°，而与EGDMA交联使WCA值增加高达51.7°。基于将涂覆表面暴露于人工雾和热水蒸汽的各种测试结果表明涂层具有优异的防雾性能。在长时间（2个月）暴露于潮湿空气中时，薄膜从未起雾。
