Correlation effects in dynamics of living polymers

Theoretically studying the dynamics of entangled living polymers which can reversibly break and recombine, we find a number of diffusion-controlled regimes of essentially non-exponential stress relaxation. This behavior is in contrast to predictions of the classical theory of Cates and its more rece...

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Bibliographic Details
Published in:Europhysics letters 2007-09, Vol.79 (6), p.66007-66007p6
Main Authors: Nyrkova, I. A, Semenov, A. N
Format: Article
Language:English
Subjects:
61.25.Hq
83.80.Qr
Condensed Matter
Physics
Soft Condensed Matter
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Summary:Theoretically studying the dynamics of entangled living polymers which can reversibly break and recombine, we find a number of diffusion-controlled regimes of essentially non-exponential stress relaxation. This behavior is in contrast to predictions of the classical theory of Cates and its more recent generalizations. The non-exponential relaxation is due to strong correlations between chain scissions and recombinations: multiple self-recombinations are much more frequent than recombinations with other chains and are resulting in fast release of topological constraints (entanglement tube coarsening). The strong renormalization effect of correlations on the lifetime of a living chain (the time period $\tau _{b}^{*}$ until the chain breaks and one of its fragments recombines with another chain) is also elucidated. We show that the correlation effects defining the dynamics are controlled by the activation energy for chain recombination and by the chain rigidity.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/79/66007