MersV1, Main, Exploration, bibRecord, 001852

Conformations of a Long Polymer in a Melt of Shorter Chains: Generalizations of the Flory Theorem

Identifieur interne : 001852 ( Main/Exploration ); précédent : 001851; suivant : 001853

Conformations of a Long Polymer in a Melt of Shorter Chains: Generalizations of the Flory Theorem

Auteurs : Michael Lang [Allemagne] ; Michael Rubinstein [États-Unis] ; Jens-Uwe Sommer [Allemagne]

Source :

ACS Macro Letters [ 2161-1653 ] ; 2015.

RBID : PMC:4621164

Abstract

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.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4621164

DOI: 10.1021/mz500777r
PubMed: 26543675
PubMed Central: 4621164

Affiliations:

Allemagne, États-Unis

Le document en format XML

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<p>Large-scale simulations of the swelling
of a long <italic>N</italic>
-mer in a melt of chemically identical <italic>P</italic>-mers are
used to investigate a discrepancy between theory and experiments.
Classical theory predicts an increase of probe chain size <italic>R</italic>
 ∼ <italic>P</italic>
<sup>–0.18</sup> with
decreasing degree of polymerization <italic>P</italic> of melt chains
in the range of 1 < <italic>P</italic>
 < <italic>N</italic>
<sup>1/2</sup>. However, both experiment and simulation data are more
consistent with an apparently slower swelling <italic>R</italic>
 ∼ <italic>P</italic>
<sup>–0.1</sup> 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.</p>
</div>
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Conformations of a Long Polymer in a Melt of Shorter Chains: Generalizations of the Flory Theorem

Conformations of a Long Polymer in a Melt of Shorter Chains: Generalizations of the Flory Theorem

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