Journal of thermal analysis

, Volume 37, Issue 6, pp 1179–1191 | Cite as

Thermooxidative degradation of nitrile-butadiene rubber

  • P. Budrugeac
  • E. Segal
  • S. Ciutacu
Article
Received:

Abstract

Results are presented on: (a) the nonisothermal degradation of nitrile-butadiene rubber (NBR) from TG, DTG and DTA data; (b) the accelerated isothermal thermal degradation of NBR at 80°, 90° and 105° from the change in weight versus time data; (c) the accelerated isothermal thermal degradation of NBR at 80°, 90° and 105° from the change in relative elongation at break with time.

The thermal analysis data showed that the following processes occur successively during the nonisothermal heating of NBR in air: (1) the volatilization of the plasticizer and other ingredients; (2) the exothermic absorption of oxygen to yield nonvolatile oxidation products; (3) the decomposition of these products or their further interaction with oxygen to form volatile products.

The results obtained from the three kinds of measurements were correlated to give a realistic picture of the processes responsible for the changes in the mechanical properties of the material as a consequence of its heating.

Keywords

Thermal Analysis Oxidation Product Thermal Degradation Volatile Product Relative Elongation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Es werden Ergebnisse über (a) den nichtisothermen Abbau von Nitril-Butadiengummi (NBR) anhand von TG-, DTG- und DTA-Daten; (b) den beschleunigten isothermen thermischen Abbau von NBR bei 80°C, 90°C und 105°C anhand von TG-Daten; (c) den beschleunigten isothermen thermischen Abbau von NBR bei 80°C, 90°C und 105°C aus der Abhängigkeit der relativen Elongation von der Zeit.

Die Daten der Thermoanalyse zeigten, daß beim nichtisothermen Erhitzen von NBR in Luft nacheinander folgende Prozesse ablaufen: (1) das Entweichen von Weichmacher und anderen Zusätzen; (2) die exotherme Absorption von Sauerstoff an den erhaltenen nichtflüchtigen Oxidationsprodukten; (3) die Zersetzung dieser Produkte oder ihre weitere Wechselwirkung mit Sauerstoff zur Bildung flüchtiger Produkte.

Die aus den dreierlei Messungen erhaltenen Ergebnisse wurden korreliert, um ein reales Bild über jene Prozesse zu geben, die als Folge des Erhitzens für die Veränderung der mechanischen Eigenschaften der Materialien verantwortlich sind.

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Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1991

Authors and Affiliations

  • P. Budrugeac
    • 1
  • E. Segal
    • 2
  • S. Ciutacu
    • 1
  1. 1.ICPE-Research Institute for Electrical EngineeringBucharestRomania
  2. 2.Department of Physical ChemistryFaculty of ChemistryBucharestRomania

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