Abstract
Despite the fact that the literature on the rheology of filled systems is extensive [1–85], the work related to the steady shear elastic properties of such systems is quite limited [5,19,27,29,31,34]. This is, of course, due to the experimental difficulties in these measurements. The usual signs of elastic behavior in filled systems are recognized by the presence of larger normal stress differences during relatively low shear measurements on a cone and plate rheogoniometer and by higher exit pressure as well as larger die swell values during high shear capillary or slit rheometry. As normal stress difference is mathematically connected with exit pressure and recoverable shear strain and, conceptually, with die swell ratio, knowledge of these would also provide the same information. The exit pressure is the small finite value p exit which is obtained when the pressure in the capillary or slit is plotted against downstream distance and the extrapolated pressure at the exit is non-zero. With appropriate assumptions, it has been shown that p exit can be related to primary normal-stress difference [77] . However, since the theory has been questioned [86] and a controversy arisen [87], it has not gained popularity as a useful measure of elasticity.
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Shenoy, A.V. (1999). Steady shear elastic properties. In: Rheology of Filled Polymer Systems. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9213-0_7
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