Thermogravimetric Analysis and Thermal Ageing of Crosslinked Nitrile Rubber/Poly(ethylene-co-vinyl Acetate) Blends |
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Authors: | Varghese H Bhagawan S S Thomas S |
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Institution: | (1) School of Chemical Sciences, Mahatma Gandhi University, Priyadarshini Hills P.O., Kottayam, 686 560 Kerala, India;(2) Propellant Engineering Division, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022 Kerala, India |
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Abstract: | The thermal behaviour of nitrile rubber (NBR)/poly(ethylene-co-vinyl acetate) (EVA) blends was studied by thermogravimetry.
The effects of blend ratio, different crosslinking systems (sulphur, peroxide and mixed), various fillers (silica, clay and
carbon black) and filler loading on the thermal properties were evaluated. It was found that the initial decomposition temperature
increased with the addition of NBR to EVA. Among the various crosslinking systems studied, the peroxide cured system showed
the highest initial decomposition temperature. This is associated with the high bond dissociation energy of C–C linkages.
The addition of fillers improved the thermal stability of the blend. The mass loss at different temperatures and activation
energy of degradation were also studied. The thermal ageing of these blends was carried out at 50 and 100°C for 72 h. It was
seen that the properties are not affected by the mild ageing condition. Also, the peroxide cured system was found to exhibit
better retention in properties, than other crosslinking systems.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | nitrile rubber and poly(ethylene-co-vinyl acetate) thermal ageing thermogravimetric analysis |
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