Physical Properties of Polyhedral Oligomeric Silsesquioxanes – Cycloolefin Copolymer Nanocomposites

Content Provider	Semantic Scholar
Author	Dorigato, Andrea Pegoretti, Alessandro Migliaresi, Claudio
Copyright Year	2009
Abstract	Properties of cycloolefin copolymer (COC)– polyhedral oligomeric silsesquioxanes (POSS) nanocomposites, prepared by melt compounding, have been investigated. Composites retained the optical transparency of the matrix up to a nanofiller content of 5 wt %. whereas for higher percentages the formation of a crystalline phase, due to the presence of agglomerated nanoparticles, was revealed by X-Ray diffraction (XRD). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) evidenced a significant decrease of the glass transition temperature (Tg) and of the thermal decomposition rate, with the POSS content. Similarly, at increasing filler content, both quasi-static tensile tests in the solid state and rheological measurements on melts showed a decrease of measured parameters (elastic modulus, ultimate elongation, loss and storage shear modulus, viscosity). These results were attributed to the formation of a soft interphase at the nanoparticles/polymer boundary due to the presence of isobutylic groups on POSS nanoparticles that limited the stress transfer process and acted in the COC matrix as a molecular lubricant agent. A small increase of the receding contact angle with the nanofiller content was also detected from dynamic contact angle (DCA) measurements. VC 2009 Wiley Periodicals, Inc. J Appl Polym Sci 114:
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Language	English
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Subject Keyword	Calculus of constructions Calorimetry Calorimetry, Differential Scanning Cartilage Oligomeric Matrix Protein Computed Tomography Scanning Systems Copolymer Elastic Modulus Elegant degradation Enterobacteria phage SCI Fill Filler (substance) Glaucoma, Open-Angle Guilty Gear Xrd Interphase John D. Wiley Lubricants Modulus robot Nanocomposite Nanocomposites Polyhedral Polyhedron Polymer Sensorineural Hearing Loss (disorder) Solid-state drive Star filler TBX1 wt Allele The Matrix Truevision TGA poly(methyl vinyl ether-co-maleic anhydride)
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Resource Type	Article