S5.3 Thermoplastic Elastomeric Nanocomposites prepared via in situ dynamic vulcanization and chain-exchange reactions Chaoying Wan1, Wenjing Wu2, Yong Zhang2 International Institute for Nanocomposites Manufacturing, WMG, University of Warwick, CV4 7AL, UK 2 School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 200240, China (chaoying.wan@warwick.ac.uk) 1 Abstract Thermoplastic elastomers (TPEs) combining good mechanical properties, heat/oil resistance and chemical stability of both thermoplastics and elastomers have found wide applications in the fields of automobile, sports and electronic appliances. In this study, polyamide/ethylene-vinyl acetate rubber (PA/EVM) based TPEs in the presence of graphene oxide (GO) were prepared via dynamic vulcanization and chain-exchange reactions. The reaction mechanisms of a sequential ring-opening ester-amide exchange reaction between caprolactam (CL) monomer and acetate groups of EVM with and without GO were proposed and investigated. Under the reaction conditions, the yield of the copolymer out of the CL/EVM (60/40) mixture was 26.4 wt% at 15% of the conversion of CL. The graft PA6 content was determined to be 4~6 wt%, and the grafting efficiency was further enhanced up to 13.1 wt% with the incorporation of 0.7 wt% of GO. This suggested that GO accelerated the polymerization reaction of CL, and also acted as a crosslinking agent to bridge homopolymerised PA6 with EVM-g-PA6 copolymer. In addition, GO was thermally reduced in situ during the reaction process, thus significantly enhanced both the volume conductivity and permittivity of the copolymers. With the addition of 2.3 wt% of GO, the stress at 100% extension of the copolymer was further enhanced by 190%, and Young’s modulus was improved by 109%. The EVM-g-PA6 copolymer and the GO reinforced copolymeric nanocomposites show a great potential as engineering thermoplastic elastomers. References 1) W Wu, C Wan, S Wang, Y Zhang. Physical properties and crystallization behavior of ethylene-vinyl acetate rubber/polyamide/graphene oxide thermoplastic elastomer nanocomposites. RSC Adv, 2013, 3, 26166-26176 2) W Wu, C Wan, Y Zhang. EVM-g-PA6 thermoplastic elastomeric nanocomposites with graphene oxide as a covalent-crosslink agent, submitted, Polymer, 2014. Short Biography Dr Chaoying Wan is Assistant Professor in Nanocomposites in WMG since 2012. She gained a PhD degree in Materials Science in 2004, and conducted postdoctoral research at Loughborough University UK from 2006 to 2008. She was a Marie Curie Fellow at Trinity College Dublin during 2009 and 2011. Her research interest is in the chemistry and physics of nanomaterials, manufacturing functional polymer nanocomposites for energy storage. 34 WMG_PolymerSymposiumAbstract-inners2.indd 34 25/11/2014 16:16