种子乳液共聚合聚氨酯-聚丙烯酸酯胶乳粒子的“反相核-壳”结构

“Inverted”core-shell structure of polyurethane-polyacrylate latex particles by seeding emulsion copolymerization

以聚氨酯（ＰＵ）乳液为种子，对丙烯酸酯进行种子乳液共聚合，所得胶乳粒子用透射电镜观察，表明胶乳粒子为“反相核－壳”结构，ＰＵ相为壳，聚丙烯酸酯（ＰＡ）相为核；从外壳到核，ＰＵ相逐渐减少，而ＰＡ相逐渐增多。种子乳液共聚合时，连续加料制得的胶乳粒子中ＰＵ相在外壳较多，而半连续加料的则较少。

The seeding emulsion copolymerization of polyurethane(PU) and polyacrylate(PA) was studied with PU emulsion as seed.The PU/PA latex particles were measured by TEM.The result showed that the latex particles were “inverted”core-shell structure with PU phase as shell and PA phase as core.The PU phase decreased gradually and PA phase increased from shell to core.The PU phase was more in PU/PA latex particles by continuous charging than by semi-continuous charging.