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POLYMER DYNAMICS: CROSSOVER FROM UNENTANGLED TO ENTANGLED REGIME
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A dynamic Monte Carlo algorithm has been designed to §reflect the true randomness of local molecular §torsion movements. Combined with NMR experiments, §our study confirmed there were finite chain length §effects. The reptation-like slowdown can be clearly §observed when M is above 2400. A bimodal mixture of §PE with one entangled component and one unentangled §component has also been studied. Good agreements §have been reached when Hess theory and Pearson-von §Meerwall model were used to fit our data. Additional §bimodal mixtures of PE studied by us involved a §small amount of short N-alkane in an entangled PE §matrix. The commonly seen excessive M dependence of §diffusion coefficients of short polymer chains §results from two contributions. One is due to the §non-iso-friction environment. Another one, having §much less to do with the environment, is still §mysterious. It may link to the non-Gaussian §statistics of the short polymer chain itself.
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