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

文献信息

发布日期 2017-09-18
DOI 10.1039/C7PY01264K
影响因子 5.582
作者

Haitao Wang, Martin Möller


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摘要

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.

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来源期刊

Polymer Chemistry

Polymer Chemistry
CiteScore: 8.6
自引率: 7.3%
年发文量: 457

Polymer Chemistry welcomes submissions in all areas of polymer science that have a strong focus on macromolecular chemistry. Manuscripts may cover a broad range of fields, yet no direct application focus is required.

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