Frontiers of Chemical Science and Engineering >

2008 , Vol. 2 >Issue 2: 127 - 134

DOI: https://doi.org/10.1007/s11705-008-0033-0

Dispersion of “guava-like” silica/polyacrylate nanocomposite particles in polyacrylate matrix

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  • 1.Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University；State Key Laboratory of Chemical Engineering, Zhejiang University; 2.Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University; 3.State Key Laboratory of Chemical Engineering, Zhejiang University

Published date: 05 Jun 2008

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Abstract

A series of “guava-like” silica/polyacrylate nanocomposite particles with close silica content and different grafting degrees were prepared via mini-emulsion polymerization using 3-(trimethoxysilyl)propyl methacrylate (TSPM) modified silica/acrylate dispersion. The silica/polyacrylate composite particles were melt-mixed with unfilled polyacrylate (PA) resin to prepare corresponding silica/polyacrylate molded composites and the dispersion mechanism of these silica particles from the “guava-like” composite particles into polyacrylate matrix was studied. It was calculated that about 110 silica particles were accumulated in the bulk of every silica/polyacrylate composite latex particle. Both the solubility tests of silica/polyacrylate composite latex particles in tetrahydrofuran (THF) and the section transmission electron microscope (TEM) micrographs of silica/polyacrylate molded composites indicated that the grafting degree of silica particles played a crucial role in the dispersion of silica/polyacrylate composite particles into the polyacrylate matrix. When the grafting degree of polyacrylate onto silica was in a moderate range (ca. 20%–70%), almost all of silica particles in these “guava-like” composite particles were dispersed into the polyacrylate matrix in a primary-particle-level. However, at a lower grafting degree, massive silica aggregations were found in molded composites because of the lack of steric protection. At a greater grafting degree (i.e., 200%), a cross-linked network was formed in the silica/polyacrylate composite particles, which prevented the dispersion of composite particles in THF and polyacrylate matrix as primary particles.

Cite this article

QI Dongming, YANG Lei, WU Minghua, SHAO Jianzhong, BAO Yongzhong . Dispersion of “guava-like” silica/polyacrylate nanocomposite particles in polyacrylate matrix[J]. Frontiers of Chemical Science and Engineering, 2008 , 2(2) : 127 -134 . DOI: 10.1007/s11705-008-0033-0

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