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The interdiffusion of long polymer chains at the interface of two melts has been studied as a function of time by neutron reflection. The time range studied spanned from the time characteristic of the motion of the single segment (Rouse time, ₄) up to the time at which the center of mass of the whole molecule has moved a radius of gyration (reptation time). At least for t>₄, the diffusion rate slows down with time until the bulk diffusion rate is reached, in agreement with the current theories for the motion of a polymeric chain in a melt.
Karim et al. (Mon,) studied this question.