Filler structure and tensile properties of starch xanthide‐reinforced vulcanizates

摘要

AbstractStress–strain behavior of some starch xanthide‐ and 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/λ − λ−2 versus λ−1, where λ is the strain ratio. Plots of samples containing highly structured filler particles were highly nonlinear, rising steeply as λ−1approached unity. Samples containing nonstructured filler particles were also highly nonlinear, rising steeply as λ−1decreased to approximately 0.4. A preliminary study of the dynamic properties of these samples, as determined in an eccentric rotating‐disk rheometer, provided li