Abstract
Water transport properties of a vulcanized natural rubber compound are studied as function of ingredient loading using gravimetric method at 800C. Rubber sheets are compounded according to a fractional factorial design of experiment, where ingredients are treated as factors varied at two levels of loading. Weight change during immersion in water is monitored. The maximum uptakes are determined from the sorption curves which showed two distinct slopes of which two uptake rates are estimated. Analysis of variance shows that high loadings of sulfur, asphalt, and used oil significantly increase the maximum uptake and first uptake rate while only sulfur and asphalt significantly increase the second uptake rate. On the other hand, high loadings of reclaimed rubber, calcium carbonate (CaCO3), mercaptobenzothiazole (MBT) significantly decrease the maximum amount of water uptake. Similarly, high loading of mercaptobenzothiazole disulfide (MBTS) significantly decrease the initial uptake rate while high loadings of reclaimed rubber, CaCO3, kaolin clay, and MBT decrease the final uptake rate of rubber compounds.
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