Effect of silver nanoparticle on the properties of poly(methyl methacrylate) nanocomposite network made by in situ photoiniferter-mediated photopolymerization (original) (raw)
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Nanoscale Research Letters, 2014
Ag/PMMA nanocomposites were successfully synthesized by in-situ technique. Transmission electron microscopy (TEM) images show that the particles are spherical in shape and their sizes are dependent on temperature. The smallest particle achieved high stability as indicated from Zeta sizer analysis. The red shift of surface plasmon resonance (SPR) indicated the increases of particle sizes. X-ray diffraction (XRD) patterns exhibit a two-phase (crystalline and amorphous) structure of Ag/PMMA nanocomposites. The complexation of Ag/PMMA nanocomposites was confirmed using Raman spectroscopy. Fourier transform infrared spectroscopy spectra confirmed that the bonding was dominantly influenced by the PMMA and DMF solution. Finally, thermogravimetric analysis (TGA) results indicate that the total weight loss increases as the temperature increases.
Glass transition and polymer dynamics in silver/poly(methyl methacrylate) nanocomposites
European Polymer Journal, 2011
Dynamic mechanical-thermal analysis (DMTA), differential scanning calorimetry (DSC), thermally stimulated depolarization currents (TSDC) and, mainly, broadband dielectric relaxation spectroscopy (DRS) were employed to investigate in detail glass transition and polymer dynamics in silver/poly(methyl methacrylate) (Ag/PMMA) nanocomposites. The nanocomposites were prepared by radical polymerization of MMA in the presence of surface modified Ag nanoparticles with a mean diameter of 5.6 nm dispersed in chloroform. The fraction of Ag nanoparticles in the final materials was varied between 0 and 0.5 wt%, the latter corresponding to 0.055 vol%. The results show that the nanoparticles have practically no effect on the time scale of the secondary b and c relaxations, whereas the magnitude of both increases slightly but systematically with increasing filler content.
Preparation, Structure, and Properties of PVA–AgNPs Nanocomposites
Polymers
The aim of the work was to prepare a polymer matrix composite doped by silver nanoparticles and analyze the influence of silver nanoparticles (AgNPs) on polymers’ optical and toxic properties. Two different colloids of AgNPs were prepared by chemical reduction. The first colloid, a blue one, contains stable triangular nanoparticles (the mean size of the nanoparticles was ~75 nm). UV–vis spectrophotometry showed that the second colloid, a yellow colloid, was very unstable. Originally formed spherical particles (~11 nm in diameter) after 25 days changed into a mix of differently shaped nanoparticles (irregular, triangular, rod-like, spherical, decahedrons, etc.), and the dichroic effect was observed. Pre-prepared AgNPs were added into the PVA (poly(vinyl alcohol)) polymer matrix and PVA–AgNPs composites (poly(vinyl alcohol) doped by Ag nanoparticles) were prepared. PVA–AgNPs thin layers (by a spin-coating technique) and fibers (by electrospinning and dip-coating techniques) were prepa...
Journal of Materials and Physical Sciences
Silver nanoparticles were prepared via process of chemical reduction using sodium borohydride as reductant. The prepared nanoparticles were then utilized for synthesizing various compositions of nanocomposites with polymeric matrix of poly (vinyl alcohol). For doing so, the nanoparticles were dispersed in the polymer solution by vigorous stirring. The solutions of the nanocomposites were cast in films. The nanocomposite films were used for various characterization techniques; out of which three are being reported in this communication; XRD, TGA/DTA and SEM. The upshot of XRD proposes a semi-crystalline nature of synthesized nanocomposite. The crystalline character of the nanocomposite enhances with an increasing doping concentration of the prepared nanoparticles. Thermal analysis suggests the degradation pattern of the polymer nanocomposite material and represents that thermal stability improves as the silver nanoparticles are added. The SEM micrograph reveals a uniform surface with...
Polymer Journal, 2009
Silver/carbon nanoparticle-poly(methyl methacrylate) nanocomposites were obtained by in situ miniemulsion polymerization. It was found by electron microscopy that nanoparticles did not disperse individually but as aggregates; however, notable increments in glass transition temperature in the order of 5 to 15 C, determined by differential scanning calorimetry, were registered by the addition of small amounts of the nanofiller (0.025, 0.050 or 0.10 wt %). Dynamic mechanical analysis indicated gains in mechanical properties, which were related to nanoparticle/polymer interfacial interaction. Results also suggested that dispersion efficiency was a determining aspect in mechanical and thermal performance.
Characterization and Biodegradable Properties of Crosslinked Silver -PVA Nanocomposites
The present work deals with biodegradable nanocomposites on based Silver nanoparticles (NS) in crosslinked polyvinyl alcohol (PVA). Cross-linking of PVA was used to improve the swelling and biodegradable properties of the obtained nanocomposites. Plasticizers were used to increase the plasticity of a nanocomposites. The biodegradability of PVA/NS nanocomposite films was evaluated under soil burial test. Fourier-Transformation Infrared (FTIR) spectroscopy as well as UV-Vis. spectra have been used to characterize the structure of PVA/NS nanocomposite. Scanning Electron Microscope (SEM) was used to characterize the morphology of PVA/NS nanocomposite. It has been found that crosslinker and nanofillers improved both the swelling and biodegradability of nanocomposite samples.
Characterization and physical properties of silver/PVA nano- composite
Research Journal of Pharmaceutical, Biological and Chemical Sciences
Silver nanoparticles filled polyvinyl alcohol (PVA) were prepared by casting method using water as a solvent. X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), scanning electron microscopy (SEM) and ultraviolet-visible (UV-Vis.) were used to characterize the prepared nanocomposites. X-ray results indicated the formation of Ag-nanoparticles with FCC phase within the PVA polymeric matrix. Scanning electron micrscopy shows that the prepared Ag-nanoparticles were dispersed and nearly uniform in diameter within the polymeric matrix. UV-Vis. absorption spectra were used to study the confined growth process of PVA-capped Agnanoparticles. The absorption showed a shift towards higher wavelength with increasing filler content.
Synthesis, mechanical andI-Vcharacteristics of Ag-PVA nanocomposite films
Physica Status Solidi (a), 2009
Hybrid polymer–inorganic nanocomposites have been prepared from an aqueous solution of polyvinyl alcohol (PVA) and silver nitrate (AgNO3). The silver nanoparticles have been generated in PVA matrix by reduction of silver ion with PVA molecules at 60–70 °C over a magnetic stirrer. X-ray diffraction studies, UV–visible analysis, transmission electron microscopy, scanning electron microscopy and current–voltage analysis were used to characterize the nanocomposite films prepared. The X-ray diffraction studies showed that silver metal is present in a face-centered cubic (fcc) crystal structure with average crystallite size 19 nm, which grows to 22 nm on annealing the film at 150 °C in air. This is in good agreement with the result obtained from TEM. The UV–visible spectrum shows a single peak at 433 nm, arising from the surface plasmon absorption of silver colloids. This result clearly indicates that silver nanoparticles are embedded in PVA. An improvement of mechanical properties (storage modulus) was also noticed due to a modification of PVA up to 0.5 wt% of silver content. The current–voltage (I–V) characteristics nanocomposite films obey Ohm's law and the current drawn increases with increasing Ag content in the films. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)