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Conformations of a Long Polymer in a Melt of Shorter Chains: Generalizations of the Flory Theorem.
ACS Macro Letters 2015 Februrary 18
Large-scale simulations of the swelling of a long N-mer in a melt of chemically identical P-mers are used to investigate a discrepancy between theory and experiments. Classical theory predicts an increase of probe chain size R ∼ P (-0.18) with decreasing degree of polymerization P of melt chains in the range of 1 < P < N (1/2). However, both experiment and simulation data are more consistent with an apparently slower swelling R ∼ P (-0.1) over a wider range of melt degrees of polymerization. This anomaly is explained by taking into account the recently discovered long-range bond correlations in polymer melts and corrections to excluded volume. We generalize the Flory theorem and demonstrate that it is in excellent agreement with experiments and simulations.
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