Study of the Thermal Degradation of Poly(vinyl chloride) by Means of Thermal Analysis and ESR Spectrometry

Shimokawa, Shigezo; Ohno, Yasuhiro; Sohma, Junkichi; Hirano, Harumochi; Endoh, Kazuo

doi:10.1246/nikkashi.1973.2016

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Esr Study Of Degradation Processes Of Polymers1

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1976

1984

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Cited by 9 publications

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“…The formation of a si!1glet-line ESR spectrum was also observed during ther-ma1227, 882,1364,1365,1666,1680,1989) and phot01788, 2239, 2246, 2441) degradation, and chemical dehydrochlorination 562 ) of poly(vinyl chloride).…”

Section: Esr Study Of Degradation Processes Of Polymersmentioning

confidence: 86%

ESR Spectroscopy in Polymer Research

Rånby¹,

Rabek²

1977

Polymers Properties and Applications

294

118

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Section: Esr Study Of Degradation Processes Of Polymersmentioning

confidence: 86%

ESR Spectroscopy in Polymer Research

Rånby¹,

Rabek²

1977

Polymers Properties and Applications

294

118

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Studies on photodegradation of poly(vinylchloride) (part 2)

Mori

Koyama

Oki

1978

Angew. Makromol. Chem.

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The electron spin resonance of poly(viny1 chloride) was measured under irradiation by ultraviolet rays. At O' 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 isconverted to a different radical when irradiation is continued. The mechanism of photodegradation of low-molecular-weight model compounds, i.e., 2,3-dichlorobutane and 2,4dichloropentane, 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. ZUSAM MENFASSUNG :Die Elcktronenspinresonanz von PVC wurde unter UV-Bestrahlung untersucht. Bei 0°C wurde bei PVC-Pulver ein breites Singulett-Spcktrum, bei einem gegossenen PVC-Film aber ein Vier-Linien-Spektrum gefunden. Das Radikal wird bei fortgesetzter Restrahlung in ein anderes umgewandelt. Der Mechanismus des durch Licht verursachten Abbaus von niedcrmolekularen Modellsubstanzen, 2,3-Dichlorbutan und 2,4-Dichlorpentan, wurde untersucht. Auf Grund der Ergebnisse dieser Experirnente wird ein Mechanismus fur den lichtinduzierten Abbau von PVC formulicrt.

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