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Issue 7, 2017
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Nanocomposite latexes containing layered double hydroxides via RAFT-assisted encapsulating emulsion polymerization

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Abstract

Nanocomposite latex particles containing layered double hydroxide (LDH) platelets were synthesized using reversible addition–fragmentation chain transfer (RAFT) seeded emulsion polymerization. A random copolymer of acrylic acid (AA) and n-butyl acrylate (BA) was first synthesized by RAFT polymerization, and then electrostatically adsorbed on both nitrate- and carbonate-intercalated Mg2Al LDH particles to provide both colloidal stability and reactivatable groups from which the subsequent emulsion polymerization could proceed. The nitrate-intercalated LDH showed higher adsorption capacity than its carbonate counterpart because interlayer nitrate ions (in addition to those on the outer surface) were also displaced by the macroRAFT agent. The two macroRAFT agent-modified LDHs were then engaged in the emulsion polymerization of a hydrophobic monomer mixture (methyl acrylate (MA) and BA, 80/20 wt/wt) to form an encapsulating polymer shell. Cryogenic-transmission electron microscopy (cryo-TEM) showed successful encapsulation of the LDH nanoplatelets in the core of the latex particles, with the use of a hydrolytically-stable cationic initiator proving key to achieving high monomer conversions.

Graphical abstract: Nanocomposite latexes containing layered double hydroxides via RAFT-assisted encapsulating emulsion polymerization

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Publication details

The article was received on 05 Oct 2016, accepted on 04 Jan 2017 and first published on 05 Jan 2017


Article type: Paper
DOI: 10.1039/C6PY01742H
Citation: Polym. Chem., 2017,8, 1233-1243

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    Nanocomposite latexes containing layered double hydroxides via RAFT-assisted encapsulating emulsion polymerization

    A. C. Perreira, S. Pearson, D. Kostadinova, F. Leroux, F. D'Agosto, M. Lansalot, E. Bourgeat-Lami and V. Prévot, Polym. Chem., 2017, 8, 1233
    DOI: 10.1039/C6PY01742H

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