摘要
采用溶胶-凝胶法,以甲基三乙氧基硅烷(MTES)为有机硅前驱体,通过酸-碱催化水解-缩合得到聚有机硅氧烷凝胶,经浸涂-提拉成膜技术在玻璃表面制备超疏水聚硅氧烷涂层。通过红外光谱(FT-IR)、水接触角(WCA)和场发射扫描电子显微镜(FE-SEM)等分析技术对涂层进行了结构表征、疏水性测试和表面形貌观察。结果表明,涂层内部形成带有甲基和残余硅羟基基团的网络结构。当n(MTES)∶n(EtOH)∶n(H2O)分别为1∶35∶8和1∶45∶8时,在室温制备的涂层对水的接触角可分别高达160°和162°,滚动角均低至7°,并且涂层在250℃以下的热处理过程中,其疏水性基本保持不变。FE-SEM观察证实了涂层表面分布着许多孔径为0.5～1.0μm的微孔和粒径为50～100 nm的纳米颗粒聚集体,具有微-纳米尺寸相结合的双重结构。此外涂层还具有较高的透明性、对腐蚀性液体具有超疏水性。研制得到的超疏水涂层有望用于玻璃、织物、金属和塑料等基底表面作为保护和防腐蚀涂膜。
Using methyltriethoxysilane（MTES） as precursor, the polysiloxane approach based on the acid-base catalysis mechanisms. Subsequently, the gels were obtained by a sol-gel superhydrophobic polysiloxane coatings were fabricated on a glass at room temperature by a simple dip coating technique. The chemical composition, hydrophobicity and morphology of the resultant coatings were investigated by Fourier transform infrared spectrum（ FT-IR）, water contact angle and field emission scanning electron microscopy（FE-SEM）. It was confirmed that the polysiloxane network had partially end-capped methyl and residual silanol groups formed inside the coatings. The water contact angles reached as high as 160° and 162°, the water sliding angle as low as 7° for two coatings with the molar ratios of MTES, EtOH and H20at 1：35：8 and 1：45：8, respectively. Their superhydrophobicities could be retained even heat-treated up to 250 ℃. FE-SEM showed that the coating surface displayed a micro-nano-sized structure composed of micropore with diameter of 0. 5 - 1.0 μm. The aggregates of nano particles were composed of primary smaller particles with diameter in the range of 50 ～ 100 nm. Meanwhile, the coatings possessed higher transparency, superhydrophobic properties for the corrosive liquid. It was expected that these superhydrophobic coatings may be attached on surfaces of glass, textile, metal substrates and so on for protecting and corrosion resistant layers.
出处
《应用化学》
CAS
CSCD
北大核心
2012年第10期1123-1129,共7页
Chinese Journal of Applied Chemistry
关键词
甲基三乙氧基硅烷
聚硅氧烷
接触角
超疏水涂层
methyltriethoxysilane, polysiloxane, contact angle, superhydrophobic coating
