Derivatives of high-amylose starch xanthate in rubber: Influence of amylose content of starch upon the water resistance of starch-reinforced styrene-butadiene rubbers
1974
Katz, H.C. | Kwolek, W.F. | Buchanan, R.A. | Doane, W.M. | Russell, C.R.
Crosslinked low-amylose (0 or 28 %) starch xanthates used as reinforcing materials in styrenebutadiene elastomer imparted better dry tensile properties than their high-amylose (55, 68 or 82 %) analogues. After immersion in water for 70 h the tensile strength of low-amylose starch reinforced vulcanizates deteriorated considerably while high-amylose starch reinforced vulcanizates changed little or not at all. Such variables as xanthate degree of substitution and starch loading influenced curing time and properties. Mode of crosslinking the xanthate significantly affected retention of starch in the coprecipitate, and produced significcmt variations in curing characteristics, and in such properties as compression set, set at break before immersion in water and tensile strength after water immersion. The method of drying affected compressions set and modulus.
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