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Formation of Monodisperse Polymer@SiO2 Core–Shell Nanoparticles via Polymerization in Emulsions Stabilized by Amphiphilic Silica Precursor Polymers: HLB Dictates the Reaction Mechanism and Particle Sizeстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 сентября 2019 г.
- Авторы: Chen Zhi, Zhao Yongliang, Zhu Xiaomin, Möller Martin
- Журнал: Macromolecules
- Том: 52
- Номер: 15
- Год издания: 2019
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 5670
- Последняя страница: 5678
- DOI: 10.1021/acs.macromol.9b00841
- Аннотация: Heterophase polymerization is the main tool to prepare polymer dispersions. In this work, we report on a new type of heterophase polymerization that allows synthesizing in one step monodisperse polymer@SiO2 core-shell particles in a wide size range from tens to hundreds of nanometers. The strategy utilizes amphiphilic silica precursor polymers, namely PEGylated polyethoxysiloxanes, which can reduce the interfacial tension between oil and water close to zero. An oil phase containing such kind of surfactants can be emulsified in water spontaneously or just under low-energy stirring. Polymerization of styrene in the resulting emulsions using an oil-soluble initiator leads to the formation of monodisperse polystyrene@SiO2 particles, whose size can be precisely adjusted by the PEGylation degree of the precursor molecules and can reach as small as 30 nm. It is demonstrated that the PEGylation degree, i.e. the HLB, also dictates the reaction mechanism that varies from suspension polymerization with breakup of monomer droplets and miniemulsion polymerization to microemulsion polymerization leading to exact “copying” of initial emulsion droplets. This technique paves a new avenue for simple, controllable and environmentally friendly production of dispersions of composite polymer particles.
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