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2016
ACL
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I.Boughattas, E.Pellizzi, M.Ferry, V.Dauvois, C.Lamouroux, A.Dannoux-Papin, E.Leoni, E.Balanzat, S.Esnouf, 'Thermal degradation of gamma-irradiated PVC: II-Isothermal experiments', Polym. Degrad. Stabil. 126 209-218 (2016) doi:10.1016/j.polymdegradstab.2015.05.010
A previous study carried out using dynamical thermogravimetry showed that radio-oxidation enhances the thermal degradation of poly(vinyl chloride) (PVC). In order to gain a better understanding of the mechanisms responsible for this thermal instability, a series of isothermal treatments were performed on radio-oxidized PVC. Two materials were studied: additive-free PVC and plasticized PVC. The samples were pre-degraded using gamma-radiation under air at room temperature. The isothermal degradation at 120 and 150 degrees C of radio-oxidized PVC was then investigated using thermogravimetry followed by mass spectrometry, in-situ infrared spectroscopy and thermodesorption coupled with gas chromatography mass spectrometry. For both pre-irradiated polymers the major weight loss appears after 30 min of heating at 120 degrees C or 150 degrees C. The gases responsible for this weight loss are mainly HCl, a small amount of benzene and CO2. Desorption of degradation molecules resulting from radio-oxidation also contributes to the weight loss.
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