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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.)

Polymer/Laponite Nanocomposite Films Produced from Surfactant-Free Latexes using Cationic Macromolecular Reversible Addition-Fragmentation Chain Transfer Copolymers

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Chaparro, Thaissa C. [1, 2] ; Silva, Rodrigo D. [1] ; D'Agosto, Franck [2] ; Lansalot, Muriel [2] ; Dalmas, Florent [3] ; Chazeau, Laurent [3] ; Santos, Amilton M. [1] ; Bourgeat-Lami, Elodie [2]
Total Authors: 8
[1] Univ Sao Paulo, Engn Sch Lorena, BR-12602810 Lorena, SP - Brazil
[2] Univ Claude Bernard Lyon 1, Univ Lyon, CP2M Catalysis Polymerizat Proc & Mat, CPE Lyon, CNRS, UMR 5128, F-69616 Villeurbanne - France
[3] Univ Lyon, Dalmas INSA Lyon, CNRS MATEIS, UMR5510, F-69621 Villeurbanne - France
Total Affiliations: 3
Document type: Journal article
Source: MACROMOLECULES; v. 54, n. 16, p. 7480-7491, AUG 24 2021.
Web of Science Citations: 0

In this work, the use of positively charged macromolecular reversible addition-fragmentation chain transfer (RAFT) copolymers (macro-RAFTs) in the synthesis of Laponite RD-based nanocomposite latex particles is described. For this purpose, two different amphiphilic copolymers composed of 2-(dimethylamino)ethyl methacrylate (DMAEMA) and n-butyl acrylate (BA) units are investigated. In the first step, the macroRAFT is adsorbed onto Laponite, and then, in the second step, the macroRAFT-modified clay platelets are used in the emulsion copolymerization of methyl methacrylate (MMA), methyl acrylate (MA), or styrene (Sty), with BA. By acting as both coupling agents and stabilizers, the macroRAFT agents lead to the formation of partially encapsulated particles and dumbbell structures. When hydrophobic monomer mixtures that can form film are used, these morphologies result in nanocomposite films with increased stiffness, in comparison to the pure polymer matrix. As observed by dynamic mechanical analysis, the high Young's modulus level presented by the composite films in the rubbery plateau (above 100 MPa when filled with 10 wt% of clay) highlights the strong mechanical reinforcement. Such an improvement can be attributed to the formation of two percolating networks, one of homogeneously distributed and connected platelets and one of macroRAFT chains, within the polymer matrix. (AU)

FAPESP's process: 10/19919-6 - Synthesis of nanocomposites with anisotropic properties by controlled radical emulsion polymerization
Grantee:Thaíssa de Camargo Chaparro
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)