We have used the pulsed‐gradient spin‐echo technique to measure self‐diffusion in low‐molecular‐weight polymers in the melt and dissolved in identical polymers of high molecular weight. Specimens used were cis‐polyisoprenes and polydimethylsiloxane. We find that, except for substantial free‐volume corrections, self‐diffusion in unentangled polyisoprene melts scales inversely with molecular weight. The results include sensitive determinations of chain‐end free volume.
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Meerwall et al. (1982) studied this question.
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