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Nanocomposites based on copolymers of fluorinated imide and polyhedral oligomeric silsesquioxane macromonomer: microstructure and morphology studies

Authors

  • Dhorali Gnanasekaran,

    1. Industrial Chemistry Laboratory, Central Leather Research Institute (Council of Scientific and Industrial Research), Chennai 600 020, India
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  • Karunakaran Madrhavan,

    1. Industrial Chemistry Laboratory, Central Leather Research Institute (Council of Scientific and Industrial Research), Chennai 600 020, India
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  • John Tsibouklis,

    1. Biomaterials and Drug Delivery Research Group, School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, Hampshire PO1 2DT, UK
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  • BoreddySR Reddy

    Corresponding author
    • Industrial Chemistry Laboratory, Central Leather Research Institute (Council of Scientific and Industrial Research), Chennai 600 020, India
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Correspondence to: BoreddySR Reddy, Industrial Chemistry Laboratory, Central Leather Research Institute (Council of Scientific and Industrial Research), Chennai 600 020, India. E-mail: induchem2000@yahoo.com

Abstract

Towards the development of copolymeric nanocomposites, N-3(trifluoromethyl)phenyl-7-oxanorbornene-5,6-dicarboximide (TFI) monomer and a macromonomer of polyhedral oligomeric silsesquioxane (POSS) were synthesized. Ring-opening metathesis polymerization to copolymerization of specified proportions of the two co-monomers was carried out. All the monomers and polymers were characterized using Fourier transform IR analysis and 1H and 29Si NMR. Gel permeation chromatography shows that copolymeric nanocomposites have a lower average molar mass than a homopolymer of TFI (HTFI). TGA shows that the thermal stability of the copolymer is inversely proportional to the proportion of POSS units. DSC studies have demonstrated that the glass transition temperature (Tg) of a nanocomposite possessing 25 wt% POSS is at a higher temperature (180 °C) than that of HTFI (175 °C). Transmission electron microscopy and AFM images of copolymers are consistent with the self-assembled spherical aggregation of POSS units, while X-ray diffraction studies have confirmed the homogeneous dispersion of the same units within the nanocomposites. © 2012 Society of Chemical Industry

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