Viscoelastic Characterization of Long Branching and Gel in Elastomers by Comparison of Large and Small Deformational Behavior
Abstract Ten different raw elastomers of varied chemical structure and Mooney viscosity were characterized with both tensile stress-strain behavior and dynamic shear behavior. The room temperature tensile stress-strain behavior was determined at strain rates of 0.239, 0.0892, and 0.00653 sec−1. These stress-strain data were reduced with a use of strain-time correspondence principle. The dynamic-shear behavior was observed over the frequency range from 10−2 to 102 rad/s. Double logarithmic Cole-Cole plots were used to characterize a relative degree of long branching and gel content. The reduced data of tensile stress-strain measurements were compared to the data of dynamic measurements. From this comparison, the sample containing a long-range crosslinked network was differentiated from that containing microgel.