Abstract
Hyperbranched polymer formation during step polymerization of AB2 type monomer with different reactivity for the second B group is investigated to find the following universal characteristics that are invariant during the whole course of polymerization: (1) The degree of branching (DB) at large degree of polymerization (P) limit, , and (2) the mean square radius of gyration for the unperturbed chains having the same P. The value of and the universal curve for change with the reactivity ratio of two B groups; however, the universal power law holds for large polymers, irrespective of the magnitude of reactivity ratio. The exponent, 0.5, is the same as that for the random branched polymers. Similarities and differences in comparison with random branched polymer formation are discussed. image
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