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Title: Macroporous polymer nanocomposites synthesised from high internal phase emulsion templates stabilised by reduced graphene oxide
Authors: Wong, L.L.C.
Barg, S.
Menner, A.
Do Vale Pereira, P.
Eda, G. 
Chowalla, M.
Saiz, E.
Bismarck, A.
Keywords: Chemically modified graphene
Macroporous polymers
Issue Date: 14-Jan-2014
Citation: Wong, L.L.C., Barg, S., Menner, A., Do Vale Pereira, P., Eda, G., Chowalla, M., Saiz, E., Bismarck, A. (2014-01-14). Macroporous polymer nanocomposites synthesised from high internal phase emulsion templates stabilised by reduced graphene oxide. Polymer (United Kingdom) 55 (1) : 395-402. ScholarBank@NUS Repository.
Abstract: Reduced graphene oxide (rGO) is known to be electrically conductive and adsorb at oil-water interfaces. It has also been shown to mechanically reinforce bulk materials. This work combines these favourable characteristics of two-dimensional rGO to develop 3D macroporous polymer nanocomposites via emulsion templating. rGO proved to be an efficient emulsifier as only 0.2 mg/ml (with respect to the oil phase) of rGO was required to stabilise water-in-oil high internal phase emulsions (HIPE) of up to 80 vol.% internal phase. After polymerisation of the continuous minority monomer (styrene and divinylbenzene) phase, macroporous polymer nanocomposites with tuneable microstructures were obtained. The storage modulus of rGO-poly(styrene-co-divinylbenzene) HIPEs increased by almost an order of magnitude when the rGO concentration used to stabilise the HIPE template increased from 0.4 to 5.0 mg/ml. The adsorption and organisation of rGO at the o/w interface in HIPEs prior to polymerisation and partial aggregation in the polymer cell walls after polymerisation resulted in conductive nanocomposites with a rGO content of as low as 0.006 vol.% (with respect to bulk polymer volume or 0.8 mg/ml with respect to the monomer volume used in the emulsion template) compared to 0.1 vol.% for dense nanocomposites previously reported. This provided evidence for the efficient arrangement of rGO within the macroporous polymer nanocomposite, creating an electrically conductive network. © 2013 Elsevier Ltd. All rights reserved.
Source Title: Polymer (United Kingdom)
ISSN: 00323861
DOI: 10.1016/j.polymer.2013.09.039
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