Thermally stimulated currents depolarization study of gamma ray irradiated PMMA

We will investigate the effect of γ-irradiation on the polymethyl methacrylate (PMMA) properties. The Fourier transform infrared spectroscopy technique in attenuated total reflexion mode (FTIR-ATR) results allowed us to show that the irradiated PMMA undergoes a scission in its lateral chain combined...

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Bibliographic Details
Published inInternational journal of polymer analysis & characterization Vol. 22; no. 7; pp. 622 - 630
Main Authors Derbil, S., Khemici, M. W., Doulache, N., Gourari, A., Haine, N.
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 03.10.2017
Taylor & Francis Ltd
Subjects
Carbonyls
Chain scission
Chains
Cleavage
Depolarization
DSC
Fourier transforms
Gamma rays
Heat measurement
Oxidation
PMMA
Polymethyl methacrylate
Radiation dosage
TSDC
α-relaxation
γ-irradiation
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Summary:We will investigate the effect of γ-irradiation on the polymethyl methacrylate (PMMA) properties. The Fourier transform infrared spectroscopy technique in attenuated total reflexion mode (FTIR-ATR) results allowed us to show that the irradiated PMMA undergoes a scission in its lateral chain combined to an oxidation phenomenon. In fact, a decrease in the carbonyl index, versus the radiation dose, is observed. The differential scanning calorimetry and the thermostimulated depolarization currents revealed that the scission in the lateral chain provides a better flexibility to the PMMA chain and an increase in the free volume of the material. The consequences of these phenomena appear in the decrease of the activation energy of PMMA and the appearance of a local order in the material at a temperature T c which decreases versus the radiation dose.
ISSN:1023-666X
1563-5341
DOI:10.1080/1023666X.2017.1356570