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Citation: LIU Xiao-Yun, HUANG Yi-Zhao, YAN Jie, ZHAO Hui-Peng, LI Lan, ZHANG Qing-Song, ZHA Liu-Sheng. Preparation and Characterization of Core/Shell Composite Microparticles with Silica Core and Poly (tert-butylmethacrylate) Shell[J]. Chinese Journal of Applied Chemistry, ;2007, 24(5): 546-550. shu

Preparation and Characterization of Core/Shell Composite Microparticles with Silica Core and Poly (tert-butylmethacrylate) Shell

1.
a State Key Laboratory for Modification of Chemical Fibers and Polymer Materials;
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b Research Center for Analysis and Measurement, Donghua University, Shanghai 200051

Corresponding author: ZHA Liu-Sheng,
Received Date: 9 June 2006
Available Online: 29 September 2006
Fund Project: 教育部科学技术研究重点研究项目(105077)资助 (105077)

Core/shell composite microparticles with silica nanoparticle as core and crosslinked poly (tert-butylmethacrylate) as shell were prepared by seed-emulsion polymerization utilizing 3-(trimethoxysilyl) propyl methacrylate (MPS) modified silica particles as seeds,tert-butylmethacrylate as monomer and sodium dodecyl sulfate (SDS) as emulsifier.The microparticles were transformed into pH-sensitive inorganic/organic composite microparticles by hydrolysis.The factors affecting the morphological structure of the composite microparticles were investigated,and it was found that the formation of pure poly (tert-butylmethacrylate) latex particles in the polymerization process could be avoided by controlling the solid content of the silica seed emulsion in the range from 1.5% to 2%.Pure poly (tert-butylmethacrylate) latex particles tended to be formed when the content of SDS exceeded 0.3%,while the core/shell composite microparticles were readily flocculated if the content of SDS was below 0.15%.Their shell thickness was enhanced as the amount of the monomer and crosslinker was increased,but their excessive use led to the formation of pure poly (tert-butylmethacrylate) latex particles and the flocculation of the formed core/shell composite microparticles.The core/shell morphological structure and chemical composition of the composite microparticles were confirmed by TEM,NMR,FTIR and contact angle analysis results.
- inorganic/organic composite microparticle,
- core/shell structure,
- silica,
- poly (tert-butylmethacrylate),
- seed-emulsion polymerization
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