Cubic-lattice simulation of the dynamics of a collapsed polymer chain

The end-to-end vector relaxation time, τ, and center-of-mass diffusion constant, D, of a nonintersecting chain with nearest-neighbor attractive interactions were investigated. Data were obtained by Monte Carlo simulation of motion as a function of temperature in the free-draining approximation. The range of temperatures includes the collapse region. It is found that the expression τ≃N〈${\mathrm{R}}^2$〉 is valid in the collapse region. The diffusion constant in the collapsed state is given by D≃${\mathrm{N}}^{\mathrm{-}2/3}$ which indicates that only the surface beads of the collapsed globule contribute to the motion.