NDLI: Graphene-containing thermoresponsive nanocomposite hydrogels of poly ( N-isopropylacrylamide ) prepared by frontal polymerization

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Graphene-containing thermoresponsive nanocomposite hydrogels of poly ( N-isopropylacrylamide ) prepared by frontal polymerization

Content Provider	Semantic Scholar
Author	Alzari, Valeria Nuvoli, Daniele Scognamillo, Sergio Piccinini, Massimo Gioffredi, Emilia Malucelli, Giulio Marceddu, Salvatore Sechi, Mario Sanna, Vanna Mariani, Alberto
Copyright Year	2011
Abstract	Frontal polymerization has been successfully used to synthesize poly(N-isopropylacrylamide) nanocomposite hydrogels containing graphene. The latter was directly achieved by ultrasound treatment of a dispersion of graphite inN-methylpyrrolidone. The dispersion, having the concentration of 2.21 g L , was characterized by TEM analysis and mixed with suitable amounts of N-isopropylacrylamide for the synthesis of graphene-containing nanocomposite polymer hydrogels. The nanocomposite hydrogels were analyzed by SEM and Raman spectroscopy, and their swelling and rheological properties were investigated. It was found that graphene strongly influences the swelling ratio, dramatically increasing it, even if present in small amounts. Finally, the rheological properties of the hydrogels were correlated with the graphene content: G0 modulus and complex viscosity were found to increase with increasing nanofiller concentration, thus indicating the occurrence of good interactions between the two phases. Nevertheless, at a high concentration (i.e., 0.13 wt.%), graphene showed a lubrication effect, lowering the rheological parameters and approaching the same pseudoplastic behaviour of the unfilled material.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://albertomariani.org/wp-content/uploads/2015/01/2011JMaterChem_2.pdf
Language	English
Access Restriction	Open
Subject Keyword	Edema Frontal solver Graphene Hydrogel Hydrogels Interaction Lubricants Modulus robot Nanocomposite Natural graphite Oral Flakes Poly A Poly Adenosine Diphosphate Ribose Polymer Raman scattering Structural Modifier Viscosity monomer physical hard work
Content Type	Text
Resource Type	Article

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