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DTA investigation of inhibited and catalyzed oxidation of polyethylene

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Abstract

Differential thermal analysis (DTA) and infrared (IR) spectroscopy have been used to investigate the effects of an antioxidant (neozone D) and an oxidation catalyst (dispersed copper) on polyethylene melt oxidation under nonisothermal conditions (samples were heated at a constant rate). An increase in the content of the antioxidant or the oxidation catalyst gives similar results: a decrease in the thickness of the oxidized surface layer and accordingly in the total amount of oxidation in polyethylene samples. This is due to an increase in the rate of oxidation of the polymer.

Résumé

Etude par ATD et par spectroscopie infrarouge (IR) de l'effet de la teneur en antioxydant (Néozone D) et en catalyseur d'oxydation (cuivre dispersé) sur l'oxydation du polyéthylène fondu, en conditions non isothermiques (échauffement des échantillons à vitesse constante). L'augmentation de la teneur en antioxydant ou en catalyseur d'oxydation donne des résultats similaires, c'est-à-dire une diminution de l'épaisseur de la couche superficielle oxydée, et, par suite, de la quantité oxydée totale des échantillons de polyéthylène. Ceci est dû à l'augmentation de la vitesse de l'oxydation du polymère.

Zusammenfassung

Differentialthermoanalyse (DTA) und Infrarotspektroskopie (IR) wurden zur Untersuchung der Wirkung des Gehaltes an Antioxidantien (Neozone D) und Oxidierungskatalysator (dispergiertes Kupfer) auf die Oxidation von Polyäthylenschmelze unter nicht-isothermischen Bedingungen (unter Aufheizung der Proben mit konstanter Geschwindigkeit) eingesetzt. Die Zunahme des Gehaltes an Antioxidanz oder Oxidierungskatalysator ergibt ähnliche Ergebnisse, d. h. Herabsetzung der Stärke der oxidierten Oberflächenschicht und, dementsprechend, der Gesamtoxidationsmenge in den Polyäthylenproben. Dies ist der Zunahme der Oxidationsgeschwindigkeit des Polymers zuzuschreiben.

Резюме

Дифференциальный те рмический анализ (DTA) и инфракрасная спектр оскопия (IR) были использованы дл я исследования влиян ия содержания антиокис лителя (неозон D) и катализатора окисл ения (диспергированн ая медь) на окисление расплава п олиэтилена в неизотермических у словиях (образцы были нагреты при постоянной скорости). Увеличение содержания антиокис лителя или катализат ора окисления дает одина ковые результаты, главным образом, умен ьшение толщины окисл енного поверхностного слоя и, согласно этому, умень шение общего количес тва окисленного продукт а в полиэтиленовых образцах. Это обуслов лено увеличением ско рости окисления полимера.

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Authors and Affiliations

  1. Institute of Mechanics of Metal-Polymer Systems of AS BSSR, Gomel, USSR

    N. I. Egorenkov, D. G. Lin & V. A. Belyi

Authors
  1. N. I. Egorenkov
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  2. D. G. Lin
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  3. V. A. Belyi
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Egorenkov, N.I., Lin, D.G. & Belyi, V.A. DTA investigation of inhibited and catalyzed oxidation of polyethylene. Journal of Thermal Analysis 10, 357–362 (1976). https://doi.org/10.1007/BF01909886

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