文献类型：期刊文献

英文题名：Study of Pu(u)A/SiO2 hybrid water dispersions and films

作者：Song, Chun-Mei[1,2]; Yu, Zhi-Gang[1]; Yuan, Qiao-Long[1]; Wang, De-Ning[1]

机构：[1] School of Material Science, East China University of Science and Technology, Shanghai 200237, China; [2] Chemistry School, East China Normal University, Shanghai 200062, China

年份：2005

卷号：13

期号：4

起止页码：344

外文期刊名：Cailiao Kexue yu Gongyi/Material Science and Technology

收录：EI(收录号：2005419405414)

语种：英文

外文关键词：Atomic force microscopy - Coatings - Dispersions - Polyacrylates - Polyurethanes - Silica - Sol-gels - Transmission electron microscopy - Water absorption

摘要：Waterborne Polyurethane (urea)/polyacrylate (PU(U)A) dispersion was synthesized from 1-iso-cyanato-3,3,5-trimethyl-5-isocyanato-methyl-cyclohexane, dimethylol propionic acid, polyester polyol(Mn=2000 g/mol, f=2), ethyldiamine, diethanol amine, methyl methacylate, butyl acrylate and hydroxyethyl methacrylate by using the in-situ polymerization, and PU(U)A/SiO2 hybrid dispersion was obtained then by using the sol-gel process. The storage time of the hybrid dispersion was more than one year at pH 7-11. Its heat stability, freeze-thaw stability was just the same of PU(U)A dispersion. The properties of the hybrid film, including hardness, adhesion, absorption of water and solvent resistance were better than those of the film without SiO2. TEM photograph of the PU(U)A/SiO2 hybrid dispersion showed that the PU(U)A particles with the diameter of 50-200 nm was surrounded by silica particles with the diameter of 8-10 nm. ART-FTIR showed that the Si-O-Si groups enriched on the surface of the hybrid film. AFM revealed that, compared with the surface of PU(U)A film, the size of hard domains became smaller.