Abstract
The concentration effects of multifunctional additive (MFA) and vulcanization systems on silica filled epoxidized natural rubber (ENR 25) was investigated in the concentration range 0–7.5 phr. Three vulcanization systems were used; conventional vulcanization (CV), semi-efficient vulcanization (semi-EV) and efficient vulcanization (EV). The cure time, ( t 90) and scorch time, ( t 2) of all vulcanization systems decrease with increasing MFA concentration. At a similar MFA concentration, the EV system showed the shortest t 2 and t 90 followed by the semi-EV and CV systems. In all the vulcanization systems, the mechanical properties have been enhanced by the incorporation of MFA. At a similar MFA concentration, semi-EV systems give better tensile and tear strengths followed by EV and CV systems.
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