溶胶-凝胶法制备硅铝溶胶增强有机/无机复合薄膜  

Organic-Inorganic Hybrid Film Modified with Silica and Alumina Sols by Sol-Gel Method

作　　者：陆静娟[1] 郭兴忠[1,2] 杨辉[1,2] 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027 [2]浙江大学绿色建材与应用技术工程研究中心,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期111-115,共5页Rare Metal Materials and Engineering

基　　金：浙江省重点科技项目(011060)

摘　　要：以甲基三甲氧基硅烷(MTMS)的水解缩聚产物作为主要成膜物质、正硅酸乙酯(TEOS)和异丙醇铝的水解缩聚产物硅溶胶和铝溶胶作为无机增强物、甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)作为表面改性剂,通过共缩聚反应在聚碳酸酯(PC)板表面制备硅铝溶胶增强有机/无机复合薄膜;采用乌氏粘度计、TG/DTA、FTIR、UV-VIS、金相显微镜、铅笔硬度测试方法及划格法对涂膜液及薄膜性能进行表征。研究结果表明,加入KH-570改性铝溶胶后的涂膜液稳定性较好,MTMS水解缩聚产物与硅溶胶、铝溶胶通过共缩聚反应在PC板表面形成带有机基团的无机交联网络结构,基本骨架由Si-O-Si、Si-O-Al、Al-O-Al组成;铝溶胶的引入提高了薄膜的耐热性能及薄膜硬度,但KH-570改性的效果不明显;薄膜对PC片有增透效果,涂膜液陈化2d后,加入KH-570改性铝溶胶后薄膜的增透效果更理想;加入KH-570改性铝溶胶后薄膜的表面平整性得到改善。With the polycondensates of methyltrimethoxysilane （MTMS） as film forming materials, the alumina sols prepared by aluminium isopropoxide and silica sols prepared by tetraethylorthosilicate （TEOS） as inorganic reinforcing materials, 3-（methacryloxypropyl）-trimethoxysilane （KH-570） as surface modifier, the organic-inorganic film was prepared on polycarbonate （PC） by co-condensation reaction. The properties of coating solution and film were studied by ubbelohde viscosity test, TG/DTA, FTIR, UV-Vis, metallographic microscope, pencil hardness and cross-cut test. The results show that the addition of KH-570 improves the stable property of the coating solution. The cross-linked inorganic structure endcapped with organic groups forms on the PC by the co-condensation reaction between hydrolysis products of MTMS, TEOS and aluminium isopropoxide, whose base backbone is composed of Si-O-Si, Si-O-Al, Al-O-Al network structure. The heat-resistance and hardness of the film increase with the addition of alumina sols. The organic-inorganic film improves the transparency of PC and the addition of KH-570 has better effect on the transparency when coating solution is aged for 2 d before coating. The surface of the film becomes smooth and homogeneous after the addition of KH-570.

关 键 词：甲基三甲氧基硅烷 硅溶胶 铝溶胶 表面改性 水解缩聚 薄膜 性能 

分 类 号：TB383.2[一般工业技术—材料科学与工程]