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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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Article information


Submitted
05 Oct 2016
Accepted
04 Jan 2017
First published
05 Jan 2017

Polym. Chem., 2017,8, 1233-1243
Article type
Paper

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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