文献类型：期刊文献

中文题名：硅溶胶在水性聚氨酯中的流变性能

英文题名：Rheological Behavior of Silica Sol Dispersed in Water-Soluble Polyurethane

作者：袁荞龙[1];应圣康[1]

机构：[1]华东理工大学材料科学研究所

年份：1997

卷号：10

期号：4

起止页码：456

中文期刊名：功能高分子学报

外文期刊名：Journal of Functional Polymers

收录：CSTPCD;;CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：硅溶胶;水溶性聚氨酯;牛顿流体;非牛顿流体;吸附

外文关键词：Silica sol, Water-Soluble polyurethane, Newtonian flow, Non-Newtonian flow, Adsorption

摘要：用离子交换法由工业级水玻璃制得不同粒径的单分散稳定硅溶胶。硅溶胶稀溶液的特性粘数为０．０２ｄＬ／ｇ，与硅溶胶的粒径无关；硅溶胶中加入电解质，分散体系由牛顿型流体变为非牛顿型流体；水溶性聚氨酯（ＰＵ－Ｅ）的稀溶液是胀流型流体，加入硅溶胶，分散体系的表观粘度下降；ＰＵ－Ｅ吸附于硅溶胶粒表面，体系属胀流型流体；ＰＵ－Ｅ吸附于硅溶胶粒间，体系为假塑性流体。
Monodispersed silica sols were prepared by ion-exchanger from sodium silicate solution (water glass). The intrinsic viscosity of the dilute silica sols is 0.02, and independent of their sphere size.The addition of electrolyte (sodium chloride) in silica sols converts Newtonian flow to non-Newtonian flow. The diluted poly(urethane-urea-amine) neutralized with glacial acetic acid is a dilatant fluid. The adsorption of poly(urethane-urea-amine) on the silica particles causes depletion of the polymer concentration in the dispersion and volume augmentation of the dispersed phase.The apparent viscosity of the water-soluble polyurethane is decreased after mixed with silica sol. The dispersion is dilatant because of the adsorption of poly(urethane-urea-amine) on the silica particles, and the flow behavior of the dispersion is a pseudoplastic fluid because of the adsorption of poly(urethane-urea-amine) among the silica spheres.