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Unraveling mechanistic events in solids-stabilized emulsion polymerization by monitoring the concentration of nanoparticles in the water phase
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Colard, Catheline A. L., Teixeira, Roberto F. A. and Bon, Stefan Antonius Franciscus (2010) Unraveling mechanistic events in solids-stabilized emulsion polymerization by monitoring the concentration of nanoparticles in the water phase. Langmuir, Vol.26 (No.11). pp. 7915-7921. doi:10.1021/la904817f
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Official URL: http://dx.doi.org/10.1021/la904817f
Abstract
The fate of nanoparticles used as stabilizers in solids-stabilized, or Pickering, emulsion polymerization or the formation of armored hybrid polymer latexes was studied. We showed that disk centrifugation can be used as a powerful quantitative tool to analyze and determine the concentration of nanoparticles M the water phase throughout solids-stabilized emulsion polymerizations. We performed a series of emulsion polymerizations using vinyl acetate, vinyl pivalate, methyl methacrylate, or butyl acrylate in presence of silica nanoparticles (Ludox TM-40, ca. 25 nm in diameter). The developed method to quantity the number of silica nanoparticles in the water phase proved to be an invaluable tool for determining key features of the polymerization process. The obtained concentration profiles versus monomer conversion explained the existence of limited coalescence of armored particles in the later stages of the solids-stabilized emulsion polymerization process of vinyl acetate, leading to nonspherical structures. Moreover, we demonstrated that the correlation of the measured number of silica nanoparticles present in the water phase with the average particle sizes of the latex particles provided excellent predictions for the coverage of the armored layer of nanoparticles on the surfaces of the polymer particles, corresponding to observed packing patterns.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Nanoparticles, Emulsion polymerization, Stabilizing agents, Latex, Synthetic | ||||
| Journal or Publication Title: | Langmuir | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 0743-7463 | ||||
| Official Date: | 1 June 2010 | ||||
| Dates: |
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| Volume: | Vol.26 | ||||
| Number: | No.11 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | pp. 7915-7921 | ||||
| DOI: | 10.1021/la904817f | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Wacker-Chemie GmbH, BASF Aktiengesellschaft |
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