Abstract
AbstractBoth conventionally reinforced and starch xanthide reinforced styrene‐butadiene (SBR) rubbers swell continuously during water immersion without reaching equilibrium and eventually mechanical breakdown occurs. During 90 days of water immersion, starch xanthide‐reinforced SBR swells more than conventionally reinforced SBR, but much less than would be calculated from the volume fraction of starch xanthide and its swelling ratio as measured separate from rubber. Swelling rate of vulcanized starch xanthide‐SBR rubber specimens depends on their shape and is negligible for specimens with low enough surface to volume ratios. Standard tensile test specimens have low cross sections in the break area and provide a sensitive measure for the deleterious effect of prolonged water immersion. The effects after 90 days in water on both swelling and tensile properties of starch xanthide‐SBR are fully reversible by drying test specimens. Starch xanthide‐SBR masterbatch can be compounded either with reactive crosslinking and coupling agents or with low‐cost extenders and fillers to reduce greatly the effect of prolonged water immersion.
Published Version
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