Effects of Natural Rubber Origin on Mechanical Properties of Rubber Compound in the Presence of Natural and Commercial Antioxidants

摘要

Different origin of rubber gives different effect towards the properties of end products. In this paper, effect of natural rubber (NR) origin on tensile properties and tear strength before and after aging for 4 and 7days were investigated in the presence of natural antioxidant (NA). Effectiveness of NA in different NR origin was compared with commercial antioxidants (TMQ). The NR from Malaysia (SMR CV60), Thailand (STR 5L), Vietnam (SVR 3L) and Cambodia (SCR L) were used in this study and cured using Semi-EV. For tensile and tear strength before aging process, STR 5L/NA shows the highest result followed by SVR 3L, SCR L and SMR CV60. This is due to higher molecular weight of STR 5L compound. But after aging for 4 and 7 days, SMRCV 60 has shown the highest percentage of retention for tensile and tear strength which indicated the lowest breakage of crosslink. From the results of tensile and tear properties, it is verified that different NR origin compound with NA vulcanizate gives reasonable result which are comparable to NR with TMQ vulcanizates.