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The diffusion coefficient D(M. Mm) of deuterated polyethylene fractions of M.W. = M in polyethylene melts of M.W. = M m, has been measured as a function of M m. The results show D(M, M m) to be essentially independent of M m for M m > 2–3Mc, M c being the critical M.W. for onset of ‘entangled’ behaviour. This result supports the suggestion that in entangled melts molecules diffuse through effectively fixed surroundings.
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