Using attenuated total-reflectance infiared spectroscopy (A TR/FTIR), the concentration of deuterated polybutadiene near the surface of a flat zinc selenide crystal was followed as it was replaced by ordinary polybutadiene by flow and difision. Experiments were performed in the melt, both below (M -1,500) and aboue (M -15,000) the entanglement threshold. The decay profiles agree well with a finite-element simulation of the system. In contrast to preuious inuestigations of C,,'s, the decay profiles of both unentangled and entangled polybutadienes are consistent with a uniform difisiuity in the near-wall region.
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