Investigation on the effect of GMA-graft structure in SAN-g-GMA-coSt on inter-phase behavior, thermal stability, and mec
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Investigation on the effect of GMA‑graft structure in SAN‑g‑GMA‑coSt on inter‑phase behavior, thermal stability, and mechanical properties of PC/SAN/GO nanocomposites Mehrad Zakizadeh1 · Ahmad Arefazar1 · Mohamad Javadzadeh1 Received: 22 July 2020 / Revised: 24 September 2020 / Accepted: 13 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, the effect of simultaneous presence of graphene oxide (GO) nanoparticles and styrene-assisted glycidyl-methacrylate-grafted SAN copolymer (SAN-gGMA-coSt), as a compatibilizer, on inter-phase behavior, microstructure, thermal, and mechanical properties of PC/SAN blends was investigated. First, the structure of GMA-grafts on the surface of the SAN copolymer was adjusted to improve the compatibility of the blend components. The role that processing conditions play in grafting efficiency was comprehensively studied by FTIR and H-NMR techniques. The results indicated that the optimized SAN-g-GMA-coSt contained grafted sequences consist of 5 GMA molecules dispersed in every 387 carbons of the straight SAN chains. This structure of GMA-grafts reduced phase separations of the blend components and the size of droplets. GO localization in the system, controlled by twostep mixing method, was studied theoretically and the prediction was confirmed by the experimental results. The DSC and DMTA thermograms illustrated that the inter-phase region expanded probably by interactions between functional groups on the surface of GO and the epoxy section of GMA. In addition, thermogravimetric and mechanical results indicated that incorporation of nanoparticles in the presence of SAN-g-GMA-coSt increased the residual mass (char yield) at 600 C and tensile strength of nanocomposites by 55% and 37%, respectively. Keywords Compatibilization · Graphene oxide · Morphology–property relationship · Mechanical–thermal analysis * Ahmad Arefazar [email protected] Mehrad Zakizadeh [email protected] Mohamad Javadzadeh [email protected] 1
Polymer and color department, Amirkabir University of Technology, Tehran, Iran
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Vol.:(0123456789)
Polymer Bulletin
Introduction Blending polymers is an effective approach to acquire products with better properties than the individual polymers because of the possibility of an improvement in properties by suitable selection of ingredients and their ratios [1, 2]. A miscible blend is a stable homogeneous mixture that represents macroscopic properties expected of a single phase material and an immiscible mixture of polymers shows multiple phases [3]. Majority of the polymer blends are incompatible, and compatibilization of the components is achieved by incorporation of suitable block or graft copolymers, reducing the interfacial tension and retarding coalescence by stabilization [4, 5]. Polycarbonate/styrene-acrylonitrile (PC/SAN) is an example of immiscible polymer blends, which shows weak mechanical properties due to the high interfacial tension despite partial miscibility of its components [6]. At acrylonitr
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