Interaction of Cationic, Anionic, and Nonionic Macroraft Homo- and Copolymers with Laponite Clay
| Autor: | Rodrigo Duarte Silva, Reinaldo Giudici, Ana Barros-Timmons, Amilton M. Santos, Igor Stefanichen Monteiro, Thaissa de Camargo Chaparro, Elodie Bourgeat-Lami |
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| Přispěvatelé: | Laboratory of Polymers, Department of Chemical Engineering, Engineering School of Lorena, University of São Paulo, Department of Chemistry (CICECO), Universidade de Aveiro, Polytechnic School of the University of São Paulo (Brazil), Universidade de São Paulo (USP), First Transnational Call in Polymer Chemistry (IUPAC) and São Paulo Research Foundation (FAPESP) (Brazil) (grants #2010/50383-5, #2010/ 19919-6 and #2011/20533-8) |
| Rok vydání: | 2019 |
| Předmět: |
Tertiary amine
Cationic polymerization Emulsion polymerization Chain transfer 02 engineering and technology Surfaces and Interfaces Raft 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Adsorption chemistry Polymer chemistry Electrochemistry Copolymer [CHIM]Chemical Sciences General Materials Science 0210 nano-technology ARGILAS Spectroscopy Acrylic acid |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2019, 35 (35), pp.11512-11523. ⟨10.1021/acs.langmuir.9b01987⟩ Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.9b01987⟩ |
| Popis: | International audience; The functionalization of Laponite RD platelets with different cationic, anionic, and nonionic homo-and copolymers synthesized by reversible addition−fragmentation chain transfer (RAFT) has been investigated. The effective interaction of the macromolecular RAFT agents (macro-RAFTs) with the inorganic particles is known to be of crucial importance for the successful coating of minerals with polymers via RAFT-mediated emulsion polymerization to produce polymer-encapsulated inorganic particles. The macroRAFT agents synthesized in the present work contain carefully selected reinitiating R groups, which bear either ionizable tertiary amine or quaternary ammonium moieties (from 2-(dimethylamino)ethyl methacrylate, DMAEMA), negatively charged acrylic acid (AA) repeat units, or neutral polyethylene glycol (PEG) side chains, and are capable of interacting with Laponite via different adsorption mechanisms. The equilibrium adsorption of these RAFT (co)polymers was investigated by the plotting of adsorption isotherms, and either L-type or H-type curves were obtained. The hydrophobicity of the macroRAFT was shown to promote adsorption, as did the pending configuration of the PEG block. Charge repulsion between AA and the negatively charged surface of Laponite at pH 7.5, on the other hand, was prejudicial for adsorption, while the strong electrostatic interaction between the cationic DMAEMA molecules and the Laponite surface led to high-affinity-type curves. |
| Databáze: | OpenAIRE |
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