文献类型：期刊文献

英文题名：Morphology of waterborne polyurethane/phenolic resin dispersion and the properties of its hybrid film with SiO2

作者：Hu, ZG; Yuan, QL; Wang, DN

机构：[1]E China Univ Sci & Technol, Dept Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2003

期号：2

起止页码：195

外文期刊名：ACTA POLYMERICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000189315400008)】；

语种：英文

外文关键词：waterbome polyurethane; phenolic resin; waterborne coating; hybrid material

摘要：A waterborne polyurethane/A-stage phenolic resin dispersion was prepared. The relationship between pH value and the solubility of the phenolic resin in water indicated that the dissolution of A-stage phenolic resin resulted from the ionization of the phenolical hydroxyl groups in basic solution. There were three kinds of granules in the waterborne polyurethane/A-stage phenolic resin dispersion: core-shell, incomplete core-shell and pure polyurethane, depending on the condensation degree and the amount of phenolic resin. The average diameter of the particles in the dispersion and the distribution width of particle size became greater and wider, respectively, with increasing the proportion of phenolic resin,while the stability of the dispersion with regard to heat,mechanical effect and freezing-melting process and the C. C. C value decreased. It was proved that the stability of the dispersion was determined mainly by the electrical properties of the dispersion, therefore it should belong to real sol, but, to some extent, the dispersion also had some properties of macromolecular solutions. The properties of the coating film prepared by the polyurethane/phenolic resin dispersion were superior to those made of pure PU film, and could modified further by hybridization with SiO2-sol.