ELECTRICAL PROPERTIES OF POLYSTYENE- ACRYLONITRILE CCPOLLYMER THIN FILM (original) (raw)
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Effect of gamma-irradiation on admittance, suceptance and conductance of Polyacrylonitrile gel
We have successfully demonstrated the effect of -irradiation on Polyacrylonitrile (PAN) gel in terms of admittance (Y), Susceptance (B) and Conductance (G). The trend of Y and B decreases by 297 μS and 138 μS respectively and conductance (G) increases by 100 μS. Electrical mechanism associated with microstructure of PAN gel under external DC bias potential is the novelty of this work. External field stimuli responded due to delocalization of charge carriers. These properties are important as novel electronic material.
Egyptian Journal of Solids, 2006
The effect of silver metal (Ag) in DC conductivity of high density polyethylene (HDPE) and low density polyethylene (LDPE) grafted films with acrylic acid (AAc) at different percentage 95, 120 and 160% has been investigated. It is also aimed to perform an extensive study on the electrical properties of (LDPE) and (HDPE) before and after irradiation by γ-rays at different environment in order to understand the nature of the conduction mechanism and charge transport in these materials. The results show a substantial increase in the electrical conductivity ( σ ) for both types of polyethylene exposed to γ-irradiation in air and in vacuum at dose range (0 -500 kGy). The improvement in σ for LDPE in oxygen is more pronounced than HDPE. Thermal activated conduction mechanism is predominant for both LDPE and HDPE at different γ-doses in air, and in oxygen. The grafting with PAAc causes an increase in the conductivity by approximately six order higher than that of ungrafted films. Grafted copolymer was obtained by adding metal salt solution AgNO 3 to both graphted LDPE and HDPE at 373 K for 15hrs. Increasing of Ag ions in the copolymer samples at room temperature leads to a slight decrease in the σ value.
The effect of neutron radiation on the electrical conduction of polystyr~ne-(Anthraquinone Copolymer) thin film has been studied. it ~as ~observed that the resistance_ of the film increas~~consierably ~hen ·the sample ""exP6sed to a large neutron radiation. The result have also shown that .the ionic conduction ClOm.inates. The value of the ionic jump distance ~as found to be larger in the case of the exposed sample.
Journal of Applied Polymer Science, 2005
Grafted copolymer of poly(tetrafluoroethylene ethylene) (ET) with acrylic acid (AAc) was prepared by direct radiation method. The obtained films were modified by treating with small amounts of Co 2ϩ and K ϩ ions (1.0 wt %). The effects of such treatment on the thermal stability and electrical conductivity of these films were studied. Cobalt treatment did not much affect the thermal degradation of the films. The results obtained revealed that k ϩ treatment enhanced the thermal degradation of ET-g-PAAc, which started 273 K lower than that observed in the case of the untreated and Co 2ϩ-treated films. Potassium and cobalt treatment of the investigated films increased their electrical conductivity () and decreased the activation energy ⌬E. The increase in values was, however, more pronounced in the case of K ϩ-treated film. These results were discussed in terms of the effective increase in the hydrophilicity of the films, especially those treated with potassium.
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry, 1986
The electrical conductivity of the graft copolymers, obtained by direct radiation grafting of Cvinylpyridine onto pure and plasticized poly(viny1 chloride) PVC films was investigated under various temperatures and applied potentials. The electrical conductivity of such graft copolymers increased as the temperature was elevated, for a given applied potential and degree of grafting. The degree of grafting, the additives in PVC, and the quatemizing agent have an influence on the electrical behaviour of the grafted films. The main feature of the activation energy of the graft copolymers was its very low values and two different activation energies were found for each copolymer based on the applied potential. The values of the activation energy for MeI-quatemized plasticized PVC film were almost twice those for the MeI-quatemized pure one. When using HCI as quatemizing agent, however, values of the activation energy for both grafted pure and plasticized PVC films were almost the same at a given applied potential.
Copolymer films of Acrylic acid/ Methyl methacrylate AAc/MMA with comonomer composition of 60/40 was prepared and then irradiated by gamma irradiation. The effect of irradiation on some of the physical properties of the copolymer films was investigated. The dose level ranged from 5 to 200 kGy. The thermo gravimetric analysis (TGA) showed that the thermal stability of the films increased with irradiation dose up to 100 kGy then it started to decrease. The results of the UV-Visible spectroscopy of the films showed a decrease in the values of optical band gap and band tail width with doses starting from 100 kGy. The DC conductivity (DC) of the films was found to decrease to about three orders of magnitude from its original value with irradiation dose up to 100 kGy then it started to increase with higher doses. Moreover, the dielectric constant and dielectric loss values were found to increase with dose up to 100 kGy which may be attributed to the increase in the number of dipoles in the films due to the irradiation of the copolymer films in air. The results indicated that crosslinking dominated over chain scission in the copolymer films with irradiation dose up to 100 kGy then at higher doses, chain scission dominated.
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Copolymer films of Acrylic acid/ Methyl methacrylate AAc/MMA with comonomer composition of 60/40 was prepared and then irradiated by gamma irradiation. The effect of irradiation on some of the physical properties of the copolymer films was investigated. The dose level ranged from 5 to 200 kGy. The thermo gravimetric analysis (TGA) showed that the thermal stability of the films increased with irradiation dose up to 100 kGy then it started to decrease. The results of the UV-Visible spectroscopy of the films showed a decrease in the values of optical band gap and band tail width with doses starting from 100 kGy. The DC conductivity ( DC) of the films was found to decrease to about three orders of magnitude from its original value with irradiation dose up to 100 kGy then it started to increase with higher doses. Moreover, the dielectric constant and dielectric loss values were found to increase with dose up to 100 kGy which may be attributed to the increase in the number of dipoles in the films due to the irradiation of the copolymer films in air. The results indicated that crosslinking dominated over chain scission in the copolymer films with irradiation dose up to 100 kGy then at higher doses, chain scission dominated.
Current Applied Physics, 2003
In recent times, blended polymers have shown a lot of promise in terms of easy processability in different shapes and forms. In the present work, polyaniline emeraldine base (PANi-EB) was doped with camphor sulfonic acid (CSA) and combined with the conducting polymer polyfluorene (PF) as well as the insulating polymer polyvinyl chloride (PVC) to synthesize CSA doped PANi-PF and PANi-PVC blended polymers. It is well known that PANi when doped with CSA becomes highly conducting. However, its poor mechanical properties, such as low tensile, compressive, and flexural strength render PANi a non-ideal material to be processed for its various practical applications, such as electromagnetic shielding, anti-corrosion shielding, photolithography and microelectronic devices etc. Thus the search for polymers which are easily processable and are capable of showing high conductivity still continues.