Rheology of Small Samples
An attachment was developed for a standard torsional rheometer based on a sliding plate rheometer. The attachment can measure the dynamic shear rheological properties using samples of total volume on the order of 25mm. This is the volume of two pellets of polymer and eliminates the need to press samples as is needed for the cone and plate geometry. The results from this attachment agreed to within 4% of rheological properties measured with cone and plate and parallel plate geometries for a variety of fluids: a Brookfield oil, a high density polymer melt and a paint base. Surface tension was found to influence the dynamic modulus particularly for the low viscosity Brookfield oil. This attachment is most useful for thermally sensitive materials as one thermal cycle is eliminated since a sample need not be moulded.
KeywordsSurface Tension Rheological Property High Density Polyethylene Dynamic Modulus Dynamic Shear
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- 1.Mackay, M.E., submitted to J. Rheo.Google Scholar