File(s) under permanent embargo
Synthesis of polystyrene nanoparticles 'armoured' with nanodimensional graphene oxide sheets by miniemulsion polymerization
journal contributionposted on 2023-05-18, 08:44 authored by Che Man, SH, Stuart ThickettStuart Thickett, Whittaker, MR, Zetterlund, PB
Polystyrene particles “armoured” with nanosized graphene oxide (GO) sheets have been prepared by aqueous miniemulsion polymerization of styrene, exploiting the amphiphilic properties of GO in the absence of conventional surfactants. The nanoscale GO sheets were prepared from graphite nanofibers of diameter approximately 100 nm based on a novel procedure, thus effectively ensuring the absence of larger sheets. Polymerization proceeded to high conversion with minor coagulation, with final number-average particle diameters of approximately 500 nm, but relatively broad particle size distributions. Scanning electron microscopy analysis revealed particles with a textured surface, consistent with the expected morphology. Interestingly, analysis of GO sheets recovered from the polymerization revealed that the GO sheets are partially reduced during the polymerization—approximately 50% of the initial carboxyl groups of the GO were lost, consistent with some loss in colloidal stability at high conversion. The overall approach offers a convenient and attractive synthetic route to novel graphene-based polymeric nanostructures.
Publication titleJournal of Polymer Science Part A: Polymer Chemistry
Department/SchoolSchool of Natural Sciences
PublisherJohn Wiley & Sons Inc
Place of publication111 River St, Hoboken, USA, Nj, 07030
Rights statementCopyright 2012 Wiley Periodicals, Inc.