表面修饰亲水性纳米二氧化硅的超疏水复合膜制备

发布时间：2018-03-07 21:12

  本文选题：ATRP　切入点：含氟嵌段共聚物　出处：《华南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：含氟丙烯酸酯树脂涂层具有好的疏水性能和其他优异的性能,因此有很大的潜在应用价值。然而聚合物涂层通常机械性能与耐受性不佳,因此限制了其在实际中的应用。本课题旨在制备一种超疏水涂料不仅可经固化交联后提高涂膜性能,还可通过涂层表面的NCO基团与改性二氧化硅表面的羧基反应,从而改性二氧化硅与疏水涂层结合力,使其能在油水分离中得到较好的应用。为此,本文主要工作内容如下:首先,选择甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)和甲基丙烯酸羟乙酯(HEMA)为共聚单体,以Cu Cl/PMDETA(五甲基二乙烯三胺)为催化体系,使用ATRP法制备可交联型含氟嵌段共聚物P(MMA-HEMA-BA)-b-FMA,将其溶解在混合溶剂中并加入固化剂构筑了超疏水涂层。研究中探讨了混合溶剂中的体积比,固化剂L75的加入量以及成膜温度对涂层的疏水性和机械性能的影响及机理。结果表明:将0.04g含氟嵌段共聚物P(MMA-HEMA-BA)-b-FMA溶解于体积比为670/30的一定体积的氢氟醚与丙酮混合溶剂中,加入0.02g固化剂L75,在20℃下固化成膜,可构筑疏水角为153.2±2.1°,附着力和硬度分别为2级和3H的超疏水涂层。利用扫描电镜(SEM)和原子力显微镜(AFM)观察涂膜的表面形貌。研究表明含氟嵌段共聚物能在混合溶剂中经过自组装过程能形成微纳米结构的粗糙结构。采用ATRP聚合法制备出亲水性可交联型PAA/纳米二氧化硅,其表面接枝聚丙烯酸叔丁酯的接枝率为55.8%,APTMOS用量为m(APTMOS)/m(Si O2)=4时APTMOS/纳米二氧化硅的粒径为32.7nm。采用简单的浸渍涂膜的方式制备了亲水-超疏水复合膜,并扫描电子显微镜初步表征了亲水-疏水复合涂层的表面形貌。结果表明PAA/纳米二氧化硅粒子能分布在疏水涂层表面从而制得亲水-疏水复合膜。
[Abstract]:Fluorinated acrylate resin coatings have good hydrophobic properties and other excellent properties, so they have great potential application value. However, polymer coatings are usually poor in mechanical properties and resistance. The purpose of this paper is to prepare a superhydrophobic coating which can not only improve the film performance after curing and crosslinking, but also react with the carboxyl group on the surface of modified silica by the NCO group on the surface of the coating. Therefore, the modified silica and hydrophobic coating can be well applied in oil-water separation. The main work of this paper is as follows: firstly, Methyl methacrylate (MMA), butyl acrylate (BA) and hydroxyethyl methacrylate (HEMA) were selected as comonomers, and Cu Cl / PMDETA (pentadiethylenetriamine) was used as catalyst system. The crosslinked fluorine-containing block copolymer PnMMA-HEMA-BAN-b-FMAwas prepared by ATRP method. The superhydrophobic coating was prepared by dissolving it in the mixed solvent and adding the curing agent. The volume ratio of the mixed solvent was discussed. The effect and mechanism of the addition of curing agent L75 and film forming temperature on the hydrophobicity and mechanical properties of the coating were investigated. The results showed that 0.04g fluorine-containing block copolymer PnMMA-HEMA-BAN-b-FMA was dissolved in a mixed solvent of hydrofluoroether and acetone with a volume ratio of 670/30. After adding 0.02g curing agent L75, the film was solidified at 20 鈩，

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