Preparation of Organic/Inorganic Hybrid Polymer Emulsions with High Silicon Content and Sol-gel-derived Thin Films

• Published in: Chinese journal of chemical engineering Vol. 18; no. 1; pp. 156 - 163
• Main Author: 廖文波 瞿金清 李忠 陈焕钦
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2010
• Subjects: colloidal silica; Colloids; Crosslinking; Emulsions; Networks; Polyacrylates; polymer/SiO 2 hybrid emulsions; Silicon dioxide; sol-gel process; Thermogravimetric analysis; Thin films; water resistance; 傅里叶变换红外光谱; 有机/无机; 溶胶凝胶法; 聚合物乳液; 胶体二氧化硅; 薄膜性能; 透射电子显微镜; 高硅含量; water resistance; colloidal silica; sol-gel process; polymer/SiO 2 hybrid emulsions
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(08)60337-7

A novel polymer/SiO2 hybrid emulsion（PAES）was prepared by directly mixing colloidal silica with polyacrylate emulsion（PAE）modified by a saline coupling agent.The sol-gel-derived thin films were obtained by addition of co-solvents into the PAES.The effects ofγ-methacryloxypropyltrimethoxysilane（KH-570）content and co-solvent on the properties of PAES films were investigated.Dynamic laser scattering（DLS）data indicate that the average diameter of PAES（96 nm）is slightly larger than that of PAE（89 nm）.Transmission electron microscopy （TEM）photo discloses that colloidal silica particles are dispersed uniformly around polyacrylate particles and some of the colloidal silica particles are adsorbed on the surface of PAE particles.The crosslinking degree data and Fourier transform infrared（FT-IR）spectra confirm that the chemical structure of the PAES is changed to form Si-O-Si-polymer crosslinking networks during the film formation.Atomic force microscope（AFM）photos show the solvent induced sol-gel process of colloidal silica and the Si-based polymer distribution on the film surface of the dried PAES.Thermogravimetric analysis（TGA）curves demonstrate that the PAES films display much better thermal stability than PAE.