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Thin Film Nanocomposites Based on SBM Triblock Copolymer and Silver Nanoparticles: Morphological and Dielectric Analysis
Author(s) -
Barandiaran Irati,
Gutierrez Junkal,
Tercjak Agnieszka,
Kortaberria Galder
Publication year - 2017
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201700169
Subject(s) - materials science , nanocomposite , copolymer , nanoparticle , dielectric , methyl methacrylate , percolation threshold , chemical engineering , composite material , permittivity , polymer , nanotechnology , electrical resistivity and conductivity , optoelectronics , engineering , electrical engineering
Hybrid organic/inorganic thin film nanocomposites based on poly(styrene)‐ b ‐poly(butadiene)‐ b ‐poly(methyl methacrylate) triblock copolymer and silver nanoparticles are prepared and characterized. In order to improve the compatibility of nanoparticles with the polymeric matrix, their surface is modified with dodecanethiol surfactant, which enables a good dispersion of nanoparticles through the triblock copolymer, without the formation of aggregates. By atomic force microscopy (AFM), the dispersion level of nanoparticles is analyzed, together with their effect on the thin film surface morphology, for nanocomposites up to 15 wt% of nanoparticles. Dielectric properties of nanocomposites are studied by dielectric relaxation spectroscopy (DRS), analyzing the effect of nanoparticles on dielectric properties. Even if conductivity and permittivity of composites increase with nanoparticle content, percolation threshold is found to be at around 15% in volume. Morphologically analyzed nanocomposites are, in this way, below the threshold.