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- W4243608152 abstract "Cellulosic winding paper (made by the Kraft process) was heated dynamically in naphthenic oil in sealed glass ampoules to 200°C. Samples of paper were analysed at selected temperatures for degree of polymerization while the oil medium was analysed for furanic compounds, dissolved gases and water content. An abrupt decrease occurs in the degree of polymerization of the winding paper at ˜ 100°C. This temperature coincided with the onset of formation of carbon oxides, methane, ethane, water and furanic compounds. It was shown that the paper, and not the oil, is the predominant source of CO, CO2 and water in both inert and oxidizing atmosphere. A number of furanic degradation products of the paper were detected in the oil. 2-Furfuraldehyde was the furanic compound that was detected in the highest concentration in oil with progressive paper ageing. The results support the model that, at least below 200°C, the above degradation products directly originate from the decomposition of unstable chain ends formed by chain scission. Spulenwickelpapier aus Cellulose (hergestellt nach dem Kraft-Prozeß) wurde in verschlossenen Glasampullen in Naphthenöl auf 200°C erhitzt. Der Polymerisationsgrad von bei unterschiedlichen Temperaturen entnommenen Papierproben wurde untersucht. Im Öl wurden der Anteil an Furanen, an gelöstem Gas und der Wassergehalt bestimmt. Der Polymerisationsgrad verringert sich ab ˜ 100°C deutlich. Dies geht einher mit dem Beginn der Bildung von Kohlenoxiden, Methan, Ethan, Wasser und Furanen. Es wurde gezeigt, daß das Papier und nicht das Öl die Hauptquelle für CO, CO2 und Wasser ist, gleich ob in inerter oder oxidierender Atmosphäre. Einige Abbauprodukte der Furane konnten im Öl nachgewiesen werden. Mit fortschreitender Alterung des Papiers wurde 2-Furfuraldhyd als Hauptabbauprodukt im Öl nachgewiesen. Die Ergebnisse stützen das Modell, wonach unterhalb von 200°C die Abbauprodukte direkt aus der Zersetzung von durch Kettenspaltung gebildeten instabilen Kettenenden entstehen." @default.
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- W4243608152 date "1998-10-01" @default.
- W4243608152 modified "2023-09-28" @default.
- W4243608152 title "Study of the mechanism of thermal degradation of cellulosic paper insulation in electrical transformer oil" @default.
- W4243608152 doi "https://doi.org/10.1002/(sici)1522-9505(19981001)259:1<19::aid-apmc19>3.3.co;2-l" @default.
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