Summary
The self diffusion coefficient of melts of four monodisperse molecular weight polystyrenes and nine fractions of linear and branched polyethylene was measured by pulsed field gradient nmr. The relation D∼N−2 holds in the range of N (number of monomeric units) from about 20 up to 1500, i.e. the diffusion goes via reptation. No break was observed at the critical molecular weight MC. Due to long chain branches in polyethylene the self diffusion coefficient is lowered considerably.
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Fleischer, G. Self diffusion in melts of polystyrene and polyethylene measured by pulsed field gradient NMR. Polymer Bulletin 9, 152–158 (1983). https://doi.org/10.1007/BF00275583
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DOI: https://doi.org/10.1007/BF00275583