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Issue 40, 2017
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Synthesis of clay-armored poly(vinylidene chloride-co-methyl acrylate) latexes by Pickering emulsion polymerization and their film-forming properties

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Abstract

We report the surfactant-free emulsion copolymerization of styrene (Sty)/methyl acrylate (MA) and vinylidene chloride (VDC)/MA by using clay platelets (LAPONITE® or a mixture of LAPONITE® and Montmorillonite) as Pickering stabilizers. Several parameters such as the presence of MA, the clay percentage and the monomer composition were shown to play a crucial role in the formation and stability of the resulting clay-armored particles. Optimal batch conditions led to stable latexes with a shelf life of at least one year. The film-forming process of the clay/P(VDC-co-MA) hybrid latexes was then studied. Transmission electron microscopy analysis of ultrathin cross-sections of the nanocomposite films revealed that latexes with high VDC contents (≥90 wt%) were not film-forming, whereas those of the same polymer composition but without clay led to a continuous film, suggesting that the clay platelets hindered polymer chain interdiffusion. Decreasing the VDC content to 87 wt% enhanced chain mobility, resulting in a uniform film with a honeycomb structure arising from the original clay-armored particle morphology.

Graphical abstract: Synthesis of clay-armored poly(vinylidene chloride-co-methyl acrylate) latexes by Pickering emulsion polymerization and their film-forming properties

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Publication details

The article was received on 30 May 2017, accepted on 14 Aug 2017 and first published on 14 Aug 2017


Article type: Paper
DOI: 10.1039/C7PY00902J
Citation: Polym. Chem., 2017,8, 6217-6232
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    Synthesis of clay-armored poly(vinylidene chloride-co-methyl acrylate) latexes by Pickering emulsion polymerization and their film-forming properties

    L. Delafresnaye, P. Dugas, P. Dufils, I. Chaduc, J. Vinas, M. Lansalot and E. Bourgeat-Lami, Polym. Chem., 2017, 8, 6217
    DOI: 10.1039/C7PY00902J

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