ESR investigations on ion beam irradiated polycarbonate

Chipara, Mircea; Grecu, V.V.; Notingher, P.; Romero, J. Reyes; Chipara, Mircea

doi:10.1016/0168-583x(94)95393-7

Cited by 22 publications

(7 citation statements)

References 11 publications

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“…Furthermore, the shape of the line was not affected by the radiation dose. The same resonance spectra have been reported in gamma-irradiated polycarbonate (at long irradiation times), neutron and heavy ion-irradiated polycarbonate (Chipara et al, 1994). This is attributed to the trapped electrons, phenyl and phenoxy-type radical (Torikai et al, 1984).…”

Section: Electron Paramagnetic Resonance Spectroscopy (Epr)supporting

confidence: 71%

“…Electron paramagnetic resonance spectroscopy (EPR) is a powerful tool in the investigation of radiation-induced paramagnetic defects (free radicals) (Chipara et al, 1994). It examines the free radicals in a non-destructive way while they are in their trapping sites, by inducing transitions between electronic spin states (Edmonds and Durrani, 1979 nature of free radicals, their concentrations and the interactions among paramagnetic defects.…”

Section: Electron Paramagnetic Resonance Spectroscopy (Epr)mentioning

confidence: 99%

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Structural and optical studies of electron beam-irradiated Makrofol nuclear track detector

Nouh

El-Tayeb

Said

et al. 2007

Radiation Measurements

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Section: Electron Paramagnetic Resonance Spectroscopy (Epr)supporting

confidence: 71%

Section: Electron Paramagnetic Resonance Spectroscopy (Epr)mentioning

confidence: 99%

Structural and optical studies of electron beam-irradiated Makrofol nuclear track detector

Nouh

El-Tayeb

Said

et al. 2007

Radiation Measurements

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“…From the resonance line parameters ( g ‐value, resonance line width, line intensity, shape, anisotropy, resonance line structure, etc. ), information concerning the nature of radicals, their concentrations, and often information about their mobility can be derived 2. The temperature dependence of ESR spectra allows the estimation of the activation energy for free radicals 3–7.…”

Section: Introductionmentioning

confidence: 99%

Creation and Recombination of Free Radicals in Fluorocarbon Plasma Polymers: An Electron Spin Resonance Study

Haupt¹,

Barz²,

Oehr³

2007

Plasma Processes & Polymers

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Generation and recombination processes of plasma‐induced radicals in plasma polymers are investigated using ESR, which provides valuable information about radicals in thin polymer films. The polymer films are prepared by means of r.f. plasma polymerization of c‐C4F8. Radical numbers and densities of fluorocarbon plasma polymer coatings of different thicknesses are measured by extrapolating mixed‐order recombination processes. The kinetics of radical generation in plasma polymer films is modeled using the results of the time‐dependent radical decay studies. The life times, line‐broadening effects, activation energies, and the temperature behavior of the radicals are discussed.

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“…It is now a general knowledge that interaction of heavy ions with polymer molecules (e.g., in polymeric films which have been tracked by heavy ions) leads to bond breakage and formation of free radicals 26–28. In the present contribution, FTIR technique was used to investigate any change in the chemical structure of PC molecules after nuclear tracking and chemical etching steps.…”

Section: Resultsmentioning

confidence: 99%

Polycarbonate microfilters by nuclear tracking and chemical etching (track‐etching) technique: Preparation and characterization

Makphon

Ratanatongchai²,

Chongkum³

et al. 2006

J of Applied Polymer Sci

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Track-etched polycarbonate (PC) microfilters were successfully prepared by tracking with fission fragments in the Thai Research Reactor-1/Modification-1 nuclear reactor and chemical etching with sodium hydroxide aqueous solutions. The porosity of the as-prepared microfilters can be controlled by varying the exposure time in the nuclear reactor and the average pore diameter by varying the etching conditions. In the present work, the average pore diameter of the as-prepared microfilters ranged from ϳ2.0 to 9.5 m (workable values) and the highest pore density achieved was ϳ150,000 pores cm Ϫ2 . It was found that chemical etching also caused a reduction in the film thickness. Fourier-transform infrared spectroscopy results suggested some modifications in the chemical structure of the PC molecules after both nuclear tracking and chemical etching steps. Lastly, water permeability of the as-prepared, tracketched PC microfilters was found to increase with increasing average pore diameter.

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ESR investigations on ion beam irradiated polycarbonate

Cited by 22 publications

References 11 publications

Structural and optical studies of electron beam-irradiated Makrofol nuclear track detector

Structural and optical studies of electron beam-irradiated Makrofol nuclear track detector

Creation and Recombination of Free Radicals in Fluorocarbon Plasma Polymers: An Electron Spin Resonance Study

Polycarbonate microfilters by nuclear tracking and chemical etching (track‐etching) technique: Preparation and characterization

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