Molecular weight distribution of regular asphalts from dynamic material functions

Dynamic material functions are among the most sensitive tools for determini ng the molecular weight distribution of rheologically complex systems. The phase angle of the complex modulus especially is sensitive to the molecular weight of the studied material; it can therefore be used as the input to t he inverse problem of determining the molecular weight from this important dynamic material function. Molecular weight distributions of several regula r asphalts are calculated using the phase angle and compared with molecular weight distribution obtained by gel permeation chromatography. The problem s of calculating molecular weight distributions from rheological parameters are also discussed.