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• W1991782001 abstract "The thermal degradation of polyacrylonitrile has been studied using the techniques of thermogravimetry, differential thermal analysis and thermal volatilization analysis. The influence of experimental conditions on the results is examined. The very sharp exothermic reaction below 300° is an important feature of programmed pyrolysis in an inert atmosphere; it corresponds to the thermal polymerization of nitrile groups. It can be removed completely by isothermal ageing below 200° during which treatment there is negligible weight loss. Oxygen has a marked inhibiting effect on the exothermic reaction; in air pyrolysis, the exotherm occurs at higher temperatures. The development of colour, in relation to the thermoanalytical curves, and the reactions occurring between 250° and 1000° are discussed. La dégradation thermique du polyacrylonitrile a été étudiée en utilisant les techniques de thermogravimétrie, d'analyse thermique différentielle et d'analyse par volatilisation thermique. On examine l'influence des conditions expérimentales sur les résultats. La réaction exothermique très étroite qui se produit en-dessous de 300° est une caractéristique importante d'une pyrolyse programmée en atmosphère inerte; elle correspond à la polymérisation thermique des groupes nitriles. Elle peut être supprimée complètement si l'on effectue un vieillissement isotherme en dessous de 200°; au cours de ce traitement la perte de poids est négligeable. L'oxygène présente un net effet inhibiteur sur la réaction exothermique; au cours d'une pyrolyse à l'air, le pic exothermique se produit à de plus hautes températures. On discute les colorations et les réactions se produisant entre 25° et 1000° en fonction des courbes d'analyse thermique. Si è studiata la degradazione termica del poliacrilonitrile, facendo impiego dei metodi termogravimetrico, analisi termica differenziale e analisi di volatilizzazione termica. Si è esaminata l'influenza delle condizioni sperimentali sui risultati. La reazione fortemente esotermica sotto sotto i 300° è una caratteristica importante per la pirolisi programmata in atmosfera inerte; essa corrisponde a quella della polimerizzazione termica di gruppi nitrilici. Essa può venir eliminata completamente mediante invecchiamento isotermico al di sotto dei 200°; tale trattamento comporta una perdita di peso trascurabile. L'ossigeno ha un marcato effetto inibitore sulla reazione esotermica; con pirolisi in aria, il fenomeno esotermico si verifica a temperature più elevate. Si discutono pure l'andamento del colore, in relazione alle curve termoanalitiche, e le reazioni che si verificano tra 250° e 1000°. Der thermische Abbau von Polyacrylnitril wurde untersucht mit Hilfe der Thermogravimetrie, der Differentialthermoanalyse und der thermischen Verdampfungsanalyse. Der Einfluß der experimentellen Bedingungen auf die Ergebnisse wird festgestellt. Die sehr scharfe exotherme Reaktion unter 300° ist ein auffallendes Phänomen bei der programmierten Pyrolyse in inerter Atmosphäre; sie entspricht der thermischen Polymerisation der Nitrilgruppen. Sie kann vollständig beseitigt werden durch isothermes Altern unter 200°, wobei nur ein zu vernachlässigender Gewichtsverlust eintritt. Sauerstoff hat auf die exotherme Reaktion einen deutlich hemmenden Einfluß; bei Pyrolyse an Luft liegt die Reaktion bei höherer Temperatur. Diskutiert werden die Farbentwicklung in ihrer Beziehung zu den thermoanalytischen Kurven und die zwischen 250° und 1000° ablaufenden Reaktionen." @default.
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• W1991782001 date "1970-09-01" @default.
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• W1991782001 title "Pyrolysis of polyacrylonitrile and related polymers—I. Thermal analysis of polyacrylonitrile" @default.
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• W1991782001 doi "https://doi.org/10.1016/0014-3057(70)90046-7" @default.
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