Process for determining a molecular weight distribution in a polymer

Process for determining a molecular weight distribution in a polymer, comprising measuring a complex shear modulus as a function of the frequency, fitting an analytical function to the measured complex shear modulus or to a mastercurve determined from the measured complex shear modulus, and calculating the molecular weight distribution there from, wherein the analytical function is a sum of Cole-Cole functions which is fitted to the measured complex shear modulus or to the mastercurve determined from the measured complex shear modulus, and wherein a sum of at least three Cole-Cole functions according to

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• is fitted analytically to the complex shear modulus which has been measured as a function of frequency and is present in numeric form or to a mastercurve present in numerical form, and the relaxation time spectrum is calculated proceeding therefrom, where the parameters F0ν and f0ν are selected so as to give rise to the sum of the Cole-Cole functions in a log-log plot wherein a real part has the slope of 2 in the limiting case of small frequencies and an imaginary part has the slope of 1 in the limiting case of small frequencies.