Viscosity calculation of polydisperse branching polymers near gel point

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Abstract
The viscosity of randomly branched polymers has been calculated based on an interpolation formula by Marrinan and Hermans, which contains dependent on certain constants both the so called excluded-volume-effect and the free-draining limit. Closer inspection of the constants used shows that the first choice is better direct near the gel point and yields a logarithmic divergence of the viscosity or a finite limit depending on the gelation theory used. The theoretical calculated values for the intrinsic viscosity amount about 10 cm3/g to 20 cm3/g for typical distances from the gel point in accordance with some experimental data of Eschwey, Burchard and Whitney