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Type: Artigo de periódico
Title: Porous nanocomposite hydrogel of vinyled montmorillonite-crosslinked maltodextrin-co-dimethylacrylamide as a highly stable polymer carrier for controlled release systems
Author: Guilherme, MR
Fajardo, AR
Moia, TA
Kunita, MH
Goncalves, MD
Rubira, AF
Tambourgi, EB
Abstract: Nanocomposite hydrogel consisting of dispersed montmorillonite-crosslinked maltodextrin-co-dimethylacrylamide (malt-dex-co-DMAAm) as a highly stable device was developed. Carbon-carbon pi-bonds issued from glycidyl methacrylate (GMA) were incorporated onto both the MMT (MMT-pi) and the malt-dex (malt-dex-pi) structures. The nanocomposite copolymer hydrogel was processed via radical crosslinking reaction of malt-dex-pi with MMT-pi in the presence of DMAAm. The radical reaction of the carbon-carbon pi-bonds at the MMT-pi was verified by treating the MMT-pi with sodium persulfate. There was an excellent dispersion of the MMT-pi at the interior of the matrix even after the nanocomposite hydrogel being swollen, demonstrating that the developed methodology can imprint stability of mineral nanoparticles into a porous polymer network preventing diffusion of water-bonded silicate platelets toward the outside matrix. The water absorption profile became more dependent on the polymer relaxation for mineral-loader nanocomposite hydrogels. Higher water absorption had an impact on reduction of elasticity modulus due to softer polymer network in swollen state. (C) 2010 Elsevier Ltd. All rights reserved.
Subject: Polymer nanocomposite
Vinyl-functionalized clay
Controlled release system
Modulus of elasticity
Water transport mechanism
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: European Polymer Journal. Pergamon-elsevier Science Ltd, v. 46, n. 7, n. 1465, n. 1474, 2010.
Rights: fechado
Identifier DOI: 10.1016/j.eurpolymj.2010.04.008
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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