Graphene oxide modified with PMMA via ATRP as a reinforcement filler
authors Goncalves, G; Marques, PAAP; Barros-Timmons, A; Bdkin, I; Singh, MK; Emami, N; Gracio, J
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY
keywords MULTIWALLED CARBON NANOTUBES; TRANSFER RADICAL POLYMERIZATION; EXFOLIATED GRAPHITE OXIDE; COMPOSITES; NANOCOMPOSITES; PARTICLES; FUNCTIONALIZATION; NANOPARTICLES; ENHANCEMENT; FABRICATION
abstract Graphene is a two-dimensional new allotrope of carbon, which is stimulating great curiosity due to its superior mechanical, electrical, thermal and optical properties. Particularly attractive is the availability of bulk quantities of graphene (G) which can be easily processed by chemical exfoliation, yielding graphene oxide (GO). The resultant oxygenated graphene sheets covered with hydroxyl, epoxy and carboxyl groups offer tremendous opportunities for further functionalization opening plenty of opportunities for the preparation of advanced composite materials. In this work poly(methyl methacrylate) (PMMA) chains have been grafted from the GO surface via atom transfer radical polymerization (ATRP), yielding a nanocomposite which was soluble in chloroform. The surface of the PMMA grafted GO (GPMMA) was characterized by AFM, HRTEM, Raman, FTIR and contact angle. The interest of these novel nanocomposites lies in their potential to be homogenously dispersed in polymeric dense matrices and to promote good interfacial adhesion, of particular relevance in stress transfer to the fillers. PMMA composite films were prepared using different percentages of GPMMA and pristine GO. Mechanical analysis of the resulting films showed that loadings as low as 1% (w/w) of GPMMA are effective reinforcing agents, yielding tougher films than pure PMMA films and even than composite films of PMMA prepared with GO. In fact, addition of 1% (w/w) of GPMMA fillers led to a significant improvement of the elongation at break, yielding a much more ductile and therefore tougher material. Thermal analysis showed an increase of the thermal stability properties of these films providing evidence that strong interfacial interactions between PMMA and GPMMA are achieved. In addition, AFM analysis, in friction force mode, is demonstrated to be an effective tool to analyse the surface filler distribution on polymer matrices.
publisher ROYAL SOC CHEMISTRY
issn 0959-9428
year published 2010
volume 20
issue 44
beginning page 9927
ending page 9934
digital object identifier (doi) 10.1039/c0jm01674h
web of science category Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000283743000016
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