Filler Structure and Tensile Properties of Starch Xanthide - Reinforced Vulcanizates
نویسنده
چکیده
Stress-strain behavior of some starch xanthideand carbon black-reinforced styrene-butadiene elastomers was investigated as a function of filler particle size and structure. In starch xanthide systems, low strain behavior is sensitive to particle structure; high strain behavior, to particle size. Electron photomicrographs of the several starch xanthide-reinforced vulcanizates were analyzed with reference to filler particle size and structure. These parameters were then correlated with Mooney plots of [load/~ ~ -2] versus ~ -1, where ~ is the strain ratio. Plots of samples containing highly structured filler particles were highly nonlinear, rising steeply as ~-1 approached unity. Samples containing nonstructured filler particles were also highly nonlinear, rising steeply as ~-1 decreased to approximately 0.4. A preliminary study of the dynamic properties of these samples, as determined in an eccentric rotating-disk rheometer, provided little additional information.
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