Thermo-oxidative degradation of a carbon black compounded EPDM rubber hose |
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| Authors: | S B Kwak N S Choi |
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| Institution: | (1) Department of Environmental Engineering, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, People’s Republic of China;(2) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China;(3) Materials Science and Engineering School, Hebei University of Science and Technology, Shijiazhuang, 050054, People’s Republic of China |
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| Abstract: | A method to measure the crosslink density of carbon black was used to analyze the aging behavior of a radiator hose made of
carbon black filled EPDM (ethylene-propylene diene monomer) rubber under thermo-oxidative stresses. The crosslink density
and the strength of the skin of the rubber specimens initially decreased slightly but then increased over time. The elongation
at the break considerably reduced and did not show any similarity to the behaviors of the crosslink density. A possible cause
of this reaction might be from the formation of rigid sulphoxide crosslinks and the crosslinks produced by the reaction of
unvalcunized sulfurs. Aging the rubber specimens at 180°C caused a slight increase in the crosslink density and a large decrease
in tensile strength and elongation. The aging experiment also caused a rapid increase of microhardness in the surface skin
region. The formation of carbonyl groups in EPDM molecule chains and the formation of rigid sulphoxide crosslink, rather than
the crosslink density variation, may have had a large influence. The changing behaviours of the mechanical properties, molecule
chains and crosslinks showed significantly different characteristics in the skin and the interior with aging temperature and
time. |
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