The concentration profiles of high molecular weight, isotopic polystyrene blends in the near-surface region were directly measured using real-space composition−depth profiling based on nuclear reaction analysis. The measured profiles are in good agreement with predictions of the Schmidt−Binder mean field theory. In contrast to previous indications, we find no evidence for a flattening of the concentration profile near the surface.
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Zink et al. (1998) studied this question.
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