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

• Published in: Polymer international 2013-02, Vol.62 (2), p.190-195
• Main Authors: Gnanasekaran, Dhorali, Madrhavan, Karunakaran, Tsibouklis, John, Reddy, BoreddySR
• Format: Article
• Language: English
• Subjects: Agglomeration; Applied sciences; Composites; Copolymers; Dispersions; Exact sciences and technology; fluorinated imide; Forms of application and semi-finished materials; microstructure; Monomers; Nanocomposites; Polyhedral oligomeric silsesquioxane; Polymer industry, paints, wood; Polymerization; Technology of polymers
• ISSN: 0959-8103; 1097-0126
• DOI: 10.1002/pi.4278

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 Linear copolymers of N‐(POSS)‐7‐oxanorbornene‐5,6‐dicarboximide (PNDI) and N‐3(trifluoromethyl)phenyl‐7‐oxanorbornene‐5,6‐dicarboximide were prepared through ring opening metathesis polymerization. The POSS incorporated nanocomposites showed a self‐assembled and ordered structure of POSS aggregates.