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- W4246693352 abstract "The electron spin resonance of poly(vinyl chloride) was measured under irradiation by ultraviolet rays. At 0°C, a broad singlet spectrum was observed in case of PVC powder, but a four-line spectrum having a splitting constant of 11.5 gauss was observed in case of a cast film of PVC. It was found that the radical causing this spectrum is converted to a different radical when irradiation is continued. The mechanism of photodegradation of low-molecular-weight model compounds, i. e., 2,3-dichlorobutane and 2,4-dichloropentane, was examined. From results of these experiments, it is believed that the mechanism of photodegradation of PVC is such that a radical generated on the terminal methyl group is converted to an alkoxy radical through a peroxide and this alkoxy radical pulls off the hydrogen atom from the methylene group to form a carbonyl compound, and finally the Norrish type cleavage takes place, resulting in reduction of the molecular weight. Die Elektronenspinresonanz von PVC wurde unter UV-Bestrahlung unersucht. Bei 0°C wurde bei PVC-Pulver ein breites Singulett-Spekrum, bei einem gegossenen PVC-Film aber ein Vier-Linien-Spektrum gefunden. Das Radikal wird bei fortgesetzter Bestrahlung in ein anderes umgewandelt. Der Mechanismus des durch Licht verursachten Abbaus von niedermolekularen Modellsubstanzen, 2,3-Dichlorbutan und 2,4-Dichlorpentan, wurde untersucht. Auf Grund der Ergebnisse dieser Experimente wird ein Mechanismus für den lichtinduzierten Abbau von PVC formuliert." @default.
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- W4246693352 date "1978-05-09" @default.
- W4246693352 modified "2023-09-26" @default.
- W4246693352 doi "https://doi.org/10.1002/apmc.1978.050680110" @default.
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