Electron irradiation induced microstructural modifications in BaCl2 doped PVA: A positron annihilation study

Harisha, A.; Ravindrachary, V.; Bhajantri, R. F.; ISMAYIL, -; Sanjeev, Ganesh; Poojary, Boja; Dutta, Dhanadeep

doi:10.1016/j.polymdegradstab.2008.05.003

Cited by 26 publications

(10 citation statements)

References 23 publications

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“…16 Presence of these defects might lead to the formation of lower-energy states and decrease the gap between the conduction and valence bands in irradiated polymer. 16 Presence of these defects might lead to the formation of lower-energy states and decrease the gap between the conduction and valence bands in irradiated polymer.…”

Section: Optical Properties Of Surface Modified Polypropylene By Plasmentioning

confidence: 99%

Optical properties of surface modified polypropylene by plasma immersion ion implantation technique

Ahmed

Moon

Kim

et al. 2010

Applied Physics Letters

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Section: Optical Properties Of Surface Modified Polypropylene By Plasmentioning

confidence: 99%

Optical properties of surface modified polypropylene by plasma immersion ion implantation technique

Ahmed

Moon

Kim

et al. 2010

Applied Physics Letters

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“…The review of current literature on the topic of nanoscale free volume properties of PVA have revealed that; some investigators studied the temperature-dependence of free-volume properties [23], while others studied the effect of doping of TiO 2 [24], Cu Cl 2 [25], Ba Cl 2 [26], fMWCNT [27] and chalcone with electron irradiation [28] on the freevolume properties. As was noticed, little attention has been given to investigating the dielectric and nano-scale free volume properties of polyaniline/polyvinyl alcohol nanocomposites and this represents a gap which should be filled.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and nano-scale free volume properties of polyaniline/polyvinyl alcohol nanocomposites

El‐Gamal

Ismail

El-Mallawany

2015

J Mater Sci: Mater Electron

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Polyaniline (PANI)/polyvinyl alcohol (PVA) nanocomposites has been prepared. Scanning electron microscopy, SEM of pure PVA and PANI/PVA nanocomposite films to monitor the morphology and dispersion of PANI on the surface of the PVA films. Positron annihilation lifetime measurements were carried out, in the air, at room temperature with a conventional fast-fast coincidence spectrometer. Dielectric permittivity e 0 , dielectric loss e 00 and AC conductivity r ac of PANI/PVA nanocomposites has been achieved in the range of frequencies 40 Hz-5 MHz and temperature range of 293-353 K. It was found that; O-ps lifetime, s 3 , its intensity, I 3 and relative fractional free volume, F r increase as the PANI content increases. The dielectric permitivity e 0 and loss e 00 increase with increasing the PANI content and decreases as the frequency increases. The values of the frequency exponent for the correlated barrier hopping s and the binding energy of the charge carriers W m for the investigated nanocomposites decrease with increasing PANI content. Finally, the dielectric permittivity e 0 was found to be directly proportional to the relative fractional free volume, F r .

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“…Initially the radiation energy is deposited on a molecule in a random fashion due to the process of inter and intra molecular transfer of energy and soon it gets localized. This causes activation of long lived excited sites and formation of ions and free radicals, resulting in either the breakdown of the molecule or in the formation of crosslinks [22]. These changes are normally reflected in the values of the positron lifetime parameters.…”

Section: A Positron Annihilation Lifetime Spectroscopymentioning

confidence: 99%

“…This spectroscopic technique provides valuable insights into the chemical and physical nature of the crosslinking process. The extent of crosslinking due to irradiation from the observed shift in wave number and change in infrared transmittance associated with the specific functional groups is quantified [22]. There are certain interesting results found from literature on these aspects [33], [34], [35].…”

Section: Ftir Studiesmentioning

confidence: 99%

Electron Beam Induced Microstructural Changes and Electrical Conductivity in Bakelite RPC Detector Material

Kumar

Ravikumar

Sanjeev

et al. 2015

IEEE Trans. Nucl. Sci.

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To explore the structural modifications in terms of crosslink density and electrical conductivity in polymer based Bakelite RPC detector material was exposed to 8 MeV electron beam with the irradiation doses of 20 kGy to 100 kGy in steps of 20 kGy. The microstructural changes of Bakelite upon electron beam irradiation have been studied using Positron Annihilation Lifetime Spectroscopy (PALS), X-ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) Spectroscopy. Positron lifetime parameters viz., o-Ps lifetime and its intensity showed chain scission at lower doses (at 20 kGy and 40 kGy) followed by crosslinking due to the radical reactions. These changes are effectively explained with the help of FTIR and XRD parameters. The reduction in electrical conductivity of Bakelite material beyond 60 kGy is correlated between conducting pathways and crosslinks in the polymer matrix. The appropriate dose of electron beam on Bakelite might reduce the leakage current of Bakelite RPC detector material and hence improves the performance of the detector.

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Electron irradiation induced microstructural modifications in BaCl2 doped PVA: A positron annihilation study

Cited by 26 publications

References 23 publications

Optical properties of surface modified polypropylene by plasma immersion ion implantation technique

Optical properties of surface modified polypropylene by plasma immersion ion implantation technique

Dielectric and nano-scale free volume properties of polyaniline/polyvinyl alcohol nanocomposites

Electron Beam Induced Microstructural Changes and Electrical Conductivity in Bakelite RPC Detector Material

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