"Effects of Mooney viscosity and mass fraction of bound acrylonitrile on mechanical properties and degree of swelling of nitrile rubber 3604 and 2707"

Abstract

The effects of Mooney viscosity (MV) of raw rubbers and mass fraction of bound acrylonitrile (wAN) of nitrile rubber (NBR) 3604 and NBR 2707 on tensile strength (Ts), elongation at break (Eb) and degree of swelling (Ds) of the vulcanizates were studied. The results showed that with the increase in MV of raw rubbers, Ts and Eb of NBR 3604 and NBR 2707 vulcanizates all showed a linear increasing trend, whereas their Ds all showed a linear decreasing trend; when MV of raw rubbers of NBR 3604 and NBR 2707 increased by 1 unit, Ts of their vulca-nizates increased by 0.15 MPa and 0.02 MPa respectively, Eb of their vulcanizates increased by 1.13% and 1.30% respectively, and Ds of their vulcanizates decreased by 0.02% and 0.21% respectively. With the increase in wAN, Ts of NBR 3604 and NBR 2707 vulcanizates all showed a linear increasing trend, whereas Eb and Ds of their vulcanizates all showed a linear decreasing trend; when wAN of NBR 3604 and NBR 2707 increased by 1%, Ts of their vulcanizates all increased by 0.04 MPa, Eb of their vulcanizates decreased by 0.08% and 2.77% respectively, and Ds of their vulcanizates decreased by 0.06% and 0.25% respectively.

Keywords

• nitrile rubber
• raw rubber
• vulca-nizate
• mooney viscosity
• mass fraction of bound acrylonitrile
• tensile strength
• elongation at break
• degree of swelling