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Structure and dielectric relaxations of antibacterial sulfonated polystyrene and silver nanocomposites
Author(s) -
Atorngitjawat Pornpen,
Pipatpanyanugoon Kasem,
Aree Thammarat
Publication year - 2014
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3347
Subject(s) - materials science , nanocomposite , polystyrene , glass transition , differential scanning calorimetry , dielectric , silver nanoparticle , scanning electron microscope , fourier transform infrared spectroscopy , nanoparticle , chemical engineering , polarization (electrochemistry) , polymer , analytical chemistry (journal) , polymer chemistry , nanotechnology , composite material , chemistry , organic chemistry , optoelectronics , engineering , thermodynamics , physics
Structure and dielectric relaxations of antibacterial sulfonated polystyrene (SPS) and silver nanocomposites (SPS/Ag) were investigated via broadband dielectric spectroscopy, Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, differential scanning calorimetry, scanning electron microscopy, and wide‐angle X‐ray diffraction. SPS/Ag nanocomposites were prepared from SPS containing 2, 4, and 7 mol% of acid contents, followed by ion exchange and a reduction process. Silver nanoparticles were formed in the structural cavities of SPS films. The single glass transition temperature of the SPS copolymers was observed and increased with increasing acid contents and more enhanced with embedded silver nanoparticles because of the restriction of the polymer chain movement. The particle size of embedded silver nanoparticles was about 10 nm and well dispersed in SPS matrices. Four dielectric relaxations were observed above the glass transition temperature, and they were attributed to the fast segmental relaxation, the slow‐hindered segmental relaxation, relaxations associated with Maxwell–Wagner–Sillars interfacial polarization and electrode polarization. Weak local relaxations were observed due to the motion of sulfonated phenyl groups. Copyright © 2014 John Wiley & Sons, Ltd.