Summary
The temperatur dependence of the self diffusion coefficients of polystyrene and polyethylene in the melt was measured with the pulsed field gradient nmr technique. The temperature and molar mass dependences of the self diffusion coefficients can be described by the free volume model. Taking into account the matrix effect we detected the beginning of the break of the reptation process for polystyrene at low molar masses. The activation energies of the self diffusion process are comparable with those observed for viscosity.
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Fleischer, G. Temperature dependence of self diffusion of polystyrene and polyethylene in the melt an interpretation in terms of the free volume theory. Polymer Bulletin 11, 75–80 (1984). https://doi.org/10.1007/BF00401718
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DOI: https://doi.org/10.1007/BF00401718