Brownian dynamics simulation of uniform comb polymers in three dimensions

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Brownian dynamics simulations are made for continuum, excluded, and nonexcluded volume, uniform H-comb polymers in three dimensions. It is found that the end-to-end distance and radius of gyration of the inner branches are expanded more than those of the outer branches for excluded volume combs. The ratio of the end-to-end distance scaling amplitudes appears to be a universal quantity in agreement with the conjecture of Gaunt et al. [J. Phys. A 19, L811 (1986)]. Moreover, the ratio of the radii of gyration scaling amplitudes seems to be universal. The expansion effect is smaller in three dimensions than in two dimensions.