Porous nanocomposite hydrogel of vinyled montmorillonite-crosslinked maltodextrin-co-dimethylacrylamide as a highly stable polymer carrier for controlled release systems

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.