Effect of ion beam irradiation on metal particle doped polymer composites

Abstract

Polymethyl methacrylate (PMMA) was prepared by solution polymerization method. Different concentrations (10, 20 and 40%) of Ni powder were dispersed in PMMA and the composite films were prepared by casting method. These films were irradiated with 120 MeV Ni 10+ ions at a fluence of 5 × 10 12 ions/cm 2 . Electrical, structural and chemical properties of the composites were studied by means of an LCR meter, X-ray diffraction, FTIR spectroscopy and SEM/AFM, respectively. The results showed that the conductivity increases with metal concentration and also with ion beam irradiation. This reveals that ion beam irradiation promotes the metal/polymer bonding and converts polymeric structure into hydrogen depleted carbon network. It was observed from XRD analysis that percentage crystallinity and crystalline size decrease upon irradiation. This might be attributed to rupture of some polymeric bonds, which is also corroborated with FTIR spectroscopic analysis. Ion beam tempts graphitization of polymeric material by emission of hydrogen and/or other volatile gases. Surface morphology of the pristine and irradiated films was studied by atomic force microscopy (AFM)/scanning electron microscopy (SEM). Result showed that the surface roughness increases after ion beam irradiation.

Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO4Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation

“…The dielectric behavior of polymeric materials is frequency dependent in lower frequency and frequency independent in higher frequency region. 33 The real and imaginary parts of the dielectric parameters were calculated by the following relationswhere d is the thickness of the sample, A is the electrode area, ε 0 is the dielectric permittivity in a vacuum (8.85 × 10 –12 F/m), and ω is the angular frequency.…”

“…The dielectric constant (ε′) of a material is related to the dipole moments polarizability, which arises from electric dipoles they can change the orientation of polarization subjected to the applied electric field. The dielectric behavior of polymeric materials is frequency dependent in lower frequency and frequency independent in higher frequency region . The real and imaginary parts of the dielectric parameters were calculated by the following relations where d is the thickness of the sample, A is the electrode area, ε 0 is the dielectric permittivity in a vacuum (8.85 × 10 –12 F/m), and ω is the angular frequency.…”

Impact of polymer blending on ionic conduction mechanism and dielectric properties of sodium based PEO-PVdF solid polymer electrolyte systems

“…At intermediate frequency (10 2 -10 3 Hz), there is a decrease in permittivity and all the permittivity values have become saturated above 10 3 Hz. The high dielectric permittivity at low frequency is attributed to the superiority of electrode polarization, where, the inclination of the dipoles to orient themselves in the direction of the field applied is more [39][40]. The decline in permittivity with frequency in the intermediate zone is partly related to the involvement of the interfacial polarization effect, where, the dipoles cannot align themselves in the direction of the field employed.…”

SHI irradiation of metal doped zinc sulfide polymer nanocomposites synthesized using micro emulsion method

“…The obtained mixture was poured on to a clean glass petri disc floating on Hg to maintain uniform thickness of prepared sample. The solvent was allowed to evaporate at room temperature (25°C) to get thin films of polymer composites and finally films were then dried in vacuum oven at 30°C to remove the solvent content [19]. Average thickness of prepared thin films have been found 18 ± 2 lm and calculated as per weight, area and density relation.…”