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Pickering miniemulsion polymerization using Laponite clay as a stabilizer
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Bon, Stefan Antonius Franciscus and Colver, Patrick J. (2007) Pickering miniemulsion polymerization using Laponite clay as a stabilizer. Langmuir, Vol.23 (No.16). pp. 8316-8322. doi:10.1021/la701150q ISSN 0743-7463.
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Official URL: http://dx.doi.org/10.1021/la701150q
Abstract
Solid-stabilized, or Pickering, miniemulsion polymerizations using Laponite clay discs as stabilizer are investigated. Free radical polymerizations are carried out using a variety of hydrophobic monomers (i.e., styrene, lauryl (meth)acrylate, butyl (meth)acrylate, octyl acrylate, and 2-ethyl hexyl acrylate). Armored latexes, of which the surfaces of the particles are covered with clay discs, are obtained, as confirmed by scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). Overall polymerization kinetics of the Pickering miniemulsion polymerizations of styrene were investigated via gravimetry. Comparison with the bulk polymerization analogue clearly shows compartmentalization. Moreover, retardation effects up to intermediate monomer conversions are observed; they are more prominent for the smaller particles and are ascribed to the Laponite clay. A model is presented that allows for the prediction of the average particle size of the latexes produced as a function of the amounts of monomer and Pickering stabilizers used. It shows that under specific generic conditions the number of clay discs used correlates in a linear fashion with the total surface area of the latex particles. This is a direct result of the reversibility of the Laponite clay disc adhesion process under the emulsification conditions (i.e., sonication) used.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Langmuir | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0743-7463 | ||||
Official Date: | 31 July 2007 | ||||
Dates: |
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Volume: | Vol.23 | ||||
Number: | No.16 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 8316-8322 | ||||
DOI: | 10.1021/la701150q | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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