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Lodge, Keith B.
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document
The determination of the reaction rates, water vapor permeability, and activation energy for thermal oxidation of LDPE films
Abstract
<p>To understand the mechanism of degradation of plastics under environmental conditions, thermal oxidation of LDPE thin film from a single manufacturer was studied. Oxidation was carried out in a pressure vessel with control at four temperatures(22,50,70 and 80℃ and at 30 and 50psi oxygen pressures. Cup tests were done to determine the permeability of water vapor across the LDPE film at 60, 70, and 90<sup>0C</sup>. The extent of oxidation was monitored using ATR-FTIR and the carbonyl content calculated from the spectra. Bands centered at 1711 and 1735 cm<sup>-1</sup> was determined resulted from the carbonyl stretches. A broad band at 3100-3600cm<sup>-1</sup> is attributed to O-H stretching and the fingerprint region (<1400 cm<sup>-1</sup>) shows evidence of C-O stretches. The carbonyl content and permeability to water vapor increased with temperature, oxidation time, and oxygen pressure. Water permeation is a result of the disruption of the semi-crystalline structure of the film to produce amorphous regions within which the water vapor is more permeable. This study was a step in the direction for determining a reliable model for the degradation and eventual failure of medium voltage power cables in nuclear power plants (NPPs).</p>