Abstract
A sample of copolymer of styrene and 1,4-divinyl-2,3,5,6-tetrachlorobenzene was prepared and fractionated. Using the fractionated copolymers, effects of chain branching on the intrinsic viscosity and sedimentation coefficient were studied experimentally. It was found that in both theta and good solvents, the intrinsic viscosity of the branched polymers obeyed a new semiempirical relationship, [η]b=g0.6[η]1. Here [η]1 is the intrinsic viscosity of a linear polymer having the same molecular weight as the branched one and g is the contraction factor which is defined as the ratio of the mean-square radii of gyration between the branched and linear polymers, i.e., g=‹S2›b/‹S2›1. It was also found that the sedimentation coefficient in theta solvent agreed with the theoretical value obtained by Kurata and Fukatsu. The degree of branching estimated from the intrinsic viscosity or sedimentation coefficient was in close agreement with the value estimated from consideration of the copolymerization kinetics.
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Kurata, M., Abe, M., Iwama, M. et al. Randomly Branched Polymers. I. Hydrodynamic Properties. Polym J 3, 729–738 (1972). https://doi.org/10.1295/polymj.3.729
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DOI: https://doi.org/10.1295/polymj.3.729