  A kinetic Monte Carlo method was used to simulate the diffusion of reptating
polymer chains across the interface. A time-resolved fluorescence technique
conjunction with direct energy transfer method was used to measure the extend
of diffusion of dye labeled reptating polymer chains. The diffusion of donor
and acceptor labeled polymer chains between adjacent compartments was randomly
generated. The fluorescence decay profiles of donor molecules were simulated at
several diffusion steps to produce mixing of the polymer chains. Mixing ratios
of donor and acceptor labeled polymer chains in compartments were measured at
various stages (snapshots) of diffusion. It was observed that for a given
molecular weight, the average interpenetration contour length was found to be
proportional to the mixing ratio. Monte Carlo analysis showed that curvilinear
diffusion coefficient is inversely proportional to the weight of polymer chains
during diffusion.
