The aim of this article is to test and to improve existing models combining rheological data with the molecular weight distribution (MWD). This process of testing and improving was separated into two distinct steps: First, the mixing behavior of the relaxation modulus obtained from a polymer blend was investigated and compared with the proposed mixing behavior derived from the linear and the quadratic mixing rules with a mixing parameter equal to 1 and 2. Second, for the rst time, kernel functions weighted with the MWD are estimated directly from experimental data and compared to the weighted kernel functions published in the literature.
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