Issue 40, 2017

One-pot formation of monodisperse polymer@SiO2 core–shell nanoparticles via surfactant-free emulsion polymerization using an adaptive silica precursor polymer

Abstract

Aqueous emulsion polymerization is by far the most important method for synthesizing polymer nanoparticles. In this work we report a new type of surfactant-free emulsion polymerization process for one-pot formation of monodisperse poly(methyl methacrylate)@SiO2 core–shell nanoparticles. The strategy utilizes a silica precursor polymer, hyperbranched polyethoxysiloxane (PEOS), whose chemical structure can be adapted by hydrolysis at water/oil interfaces for their stabilization. The core–shell particles are obtained simply by adding a monomer/PEOS solution into water and subsequent heating to initiate polymerization. A high-shear emulsification step that is undesirable for industrial scale-up is not needed. In contrast to most emulsion polymerization processes where water soluble initiators are employed, an oil soluble initiator is required in this process for achieving narrow particle size distribution and precise control of silica content in the particles. As the polymerization proceeds, the growing chains are precipitated from the aqueous phase forming polymer particles, which are in turn stabilized by partially hydrolysed amphiphilic PEOS molecules. After the polymerization is complete, the conversion of PEOS continues depositing silica onto the silica-coated polymer particles. This method allows an easy control of silica shell thickness by varying the PEOS concentration and the particle size can be adjusted by changing the pH of the aqueous phase.

Graphical abstract: One-pot formation of monodisperse polymer@SiO2 core–shell nanoparticles via surfactant-free emulsion polymerization using an adaptive silica precursor polymer

Article information

Article type
Paper
Submitted
27 Jul 2017
Accepted
17 Sep 2017
First published
18 Sep 2017

Polym. Chem., 2017,8, 6263-6271

One-pot formation of monodisperse polymer@SiO2 core–shell nanoparticles via surfactant-free emulsion polymerization using an adaptive silica precursor polymer

Y. Zhao, H. Wang, X. Zhu and M. Möller, Polym. Chem., 2017, 8, 6263 DOI: 10.1039/C7PY01264K

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