DISPERSION STABILITY AND RHEOLOGICAL BEHAVIOR OF SUSPENSIONS OF POLYSTYRENE COATED FUMED SILICA PARTICLES IN POLYSTYRENE SOLUTIONS  

作　　者：Xian-ze Yin Ye-qiang Tan Yi-hu Song Qiang Zheng 

机构地区：[1]Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education, Zhejiang University, Hangzhou 310027, China [2]Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

出　　处：《Chinese Journal of Polymer Science》2012年第1期26-35,共10页高分子科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51073136);the Fundamental Research Funds for the Central Universities of China(No.2010QNA4011)

摘　　要：Polystyrene coated silica（SiO_2@PS） core-shell composite particles with averaged diameter of about 290 nm were prepared by in situ emulsion polymerization of styrene on the surface ofγ-methacryloxypropyltrimethoxysilane grafted SiO_2 nanoparticles of 20-50 nm in diameter.Rheological behavior and dispersion stability of SiO_2@PS suspension in 10 wt%PS solution were compared with suspensions of untreated SiO_2 and silane modified SiO_2 nanoparticles.Suspensions of the untreated and the silane modified SiO_2 exhibited obvious shear thinning.The SiO-2@PS suspension exhibits shear viscosity considerably smaller than suspensions of untreated and silane modified SiO_2 at low shear rates.Transmission electron microscopy showed that the composite particles can uniformly and stably disperse in PS solution compared to other suspensions,implying that the PS shell can effectively enhance the particle compatibility with PS macromolecules in solution.Polystyrene coated silica（SiO_2@PS） core-shell composite particles with averaged diameter of about 290 nm were prepared by in situ emulsion polymerization of styrene on the surface ofγ-methacryloxypropyltrimethoxysilane grafted SiO_2 nanoparticles of 20-50 nm in diameter.Rheological behavior and dispersion stability of SiO_2@PS suspension in 10 wt%PS solution were compared with suspensions of untreated SiO_2 and silane modified SiO_2 nanoparticles.Suspensions of the untreated and the silane modified SiO_2 exhibited obvious shear thinning.The SiO-2@PS suspension exhibits shear viscosity considerably smaller than suspensions of untreated and silane modified SiO_2 at low shear rates.Transmission electron microscopy showed that the composite particles can uniformly and stably disperse in PS solution compared to other suspensions,implying that the PS shell can effectively enhance the particle compatibility with PS macromolecules in solution.

关 键 词：Fumed SiO_2 POLYSTYRENE Composite particles SUSPENSION Steady rheology 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业] TS193.8[轻工技术与工程—纺织化学与染整工程]