文献类型：期刊文献

英文题名：Effect of the content of urea groups on the particle size in water-borne polyurethane or polyurethane/polyacrylate dispersions

作者：Song, Chunmei[1]; Yuan, Qiaolong[1]; Wang, Dening[1]

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

年份：2004

卷号：282

期号：6

起止页码：642

外文期刊名：COLLOID AND POLYMER SCIENCE

收录：;EI(收录号：2004248206151);WOS:【SCI-EXPANDED(收录号:WOS:000220485600014)】；

语种：英文

外文关键词：polyurethane/polyacrylate; water-borne coating; particle size; urea group

摘要：A series of anionic water-borne polyurethane and polyurethane/polyacrylate dispersions and their paint films was prepared. It was found by using TEM that there were three phases in the polyurethane/polyacrylate film, i.e. the hard segment-rich phase and the soft segment-rich phase of polyurethane, and the polyacrylate phase. By increasing the content of urea groups, the glass transition temperature of the soft segments and the dissociation temperature of the long-distance ordering of the hard segments were raised. This should mean that the motion of macromolecular chains was hindered by increasing the content of urea groups, and the hydrophilic carboxyl groups embedded initially in macromolecular coils could thus not transfer easily to the particle surface, which resulted in a greater average particle size in the dispersion.