1. Hybrid microspheres and percolated monoliths synthesized via Pickering emulsion co-polymerization stabilized by in situ surface-modified silica nanoparticles.
- Author
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Fouconnier, B., López-Serrano, F., Lee, R. I. Puente, Terrazas-Rodríguez, J. E., Román-Guerrero, A., Barrera, M. C., and Escobar, J.
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SILICA nanoparticles , *MICROSPHERES , *COPOLYMERIZATION , *EMULSION polymerization , *EMULSIONS , *CAPILLARY liquid chromatography , *POLYMETHACRYLATES - Abstract
The Pickering emulsion polymerization of styrene (St), divinylbenzene (DVB) as a crosslinking agent, and sodium 4-vinyl benzene sulfonate (VBS) used for in situ surface-modification of silica nanoparticles (SNps) was investigated. At 1.0 wt% DVB, amphiphilic SNps with hydrophobic patches were formed, further self-assembling into copolymer-SNps clusters occurred. Subsequently, these clusters grow by monomer swelling to finally lead to the formation of core-shell polymer microspheres. Unlike the hydrophilic patchy SNps, at 2.0 and 3.0 wt% DVB, surface-patterned SNps with higher effective hydrophobicity do not self-assemble in the water phase but rather lead to the formation of monoliths. The polymerization mechanisms related to the formation of polymer silica-coated microspheres hybrid-materials, or percolated monoliths with bi-continuous porosity, formed by interfacially jammed emulsion gel (bijels) templates, are discussed herein. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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