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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tailoring the Morphology of Polymer/Montrnorillonite Hybrid Latexes by Surfactant-Free Emulsion Polymerization Mediated by Arnphipathic MacroRAFT Agents

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Silva, Rodrigo Duarte [1] ; Chaparro, Thaissa de Camargo [1, 2] ; Monteiro, Igor Stefanichen [1] ; Dugas, Pierre-Yves [2] ; D'Agosto, Franck [2] ; Lansalot, Muriel [2] ; dos Santos, Arnilton Martins [1] ; `Bourgeat-Lami, Elodie
Total Authors: 8
[1] Univ Sao Paulo, Engn Sch Lorena, Lab Polymers, BR-12602810 Lorena, SP - Brazil
[2] Univ Claude Bernard Lyon 1, Univ Lyon, CPE Lyon, CNRS, UMR 5265, C2P2, 43 Bvd 11 Novembre 1918, F-69616 Villeurbanne - France
Total Affiliations: 2
Document type: Journal article
Source: MACROMOLECULES; v. 52, n. 13, p. 4979-4988, JUL 9 2019.
Web of Science Citations: 2

In this work, we report the reversible addition fragmentation chain transfer (RAFT)-mediated synthesis of polymer/montmorillonite (MMT) hybrid latexes by surfactant-free emulsion polymerization. Macromolecular RAFT (macro-RAFT) agents combining repeating units of acrylic acid (AA), n-butyl acrylate (BA), poly(ethylene glycol) methyl ether acrylate (PEGA), or 2-(dimethylamino)ethyl methacrylate (DMAEMA) were adsorbed on exfoliated sodium MMT platelets and the resulting aqueous colloidal dispersions were used as the reaction medium for emulsion copolymerization of methyl methacrylate and BA under starved-feed conditions. The AA- and PEGA-containing macroRAFT agents led to the formation of polymer-decorated-clay platelets, indicating some affinity of the growing polymer chains for the clay surface, albeit not sufficient for the complete encapsulation of the clay sheets inside the polymer particles. When DMAEMA-based macroRAFT agents were used, transmission electron microscopy analyses of the hybrid latexes revealed the formation of a polymer layer on the MMT platelets indicating that the polymerization took place on the inorganic surface resulting in full encapsulation while preserving the shape anisotropy of the original clay mineral. (AU)

FAPESP's process: 10/50383-5 - Polymer-encapsulation of anisotropic inorganic particles by raft-mediated emulsion polymerization
Grantee:Amilton Martins dos Santos
Support Opportunities: Regular Research Grants
FAPESP's process: 11/20533-8 - Encapsulation of montmorillonite through RAFT controlled radical polymerization in emulsion for the production of nanostructured films with anisotropic properties
Grantee:Rodrigo Duarte Silva
Support Opportunities: Scholarships in Brazil - Doctorate