Title :
Accelerated thermal and radiative ageing of hydrogenated NBR for DRC
Author :
Mares, George ; Notingher, Petru
Author_Institution :
Ind. Eng. & Sci. Service, EUROTEST S.A., Bucharest, Romania
Abstract :
The accelerated thermal and gamma radiation ageing of hydrogenated butadiene-acrylonitrile rubber (HNBR) carbon black-T80 has been studied by measuring the residual deformation under constant deflection-DRC, in air, using a relevant equation for the relaxation phenomena. The residual deformation under constant deflection during the process of accelerated ageing is increasing but the structure of the polymer answers in the proper manner to the mechanical stress. The degradation equations were obtained using the Alfrey model for the relaxation polymer, subject to compression and an Arrhenius dependence for the chemical reaction rate. The inverted relaxation time for the thermal degradation depends upon the chemical reaction rate and the dose rate of gamma radiation
Keywords :
ageing; carbon; composite insulating materials; electric breakdown; gamma-ray effects; heat treatment; insulation testing; life testing; rubber; Alfrey model; Arrhenius dependence; accelerated radiative ageing; accelerated thermal ageing; carbon black-T80; chemical reaction rate; constant deflection; degradation equations; gamma radiation dose rate; hydrogenated butadiene-acrylonitrile rubber; insulation breakdown studies; inverted relaxation time; mechanical stress; relaxation phenomena; relaxation polymer; residual deformation; thermal degradation; Accelerated aging; Chemicals; Equations; Gamma rays; Polymers; Rubber; Stress; Temperature; Thermal degradation; Thermal force;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549359
