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Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Dynamic Feature of Incipient Polymer Collapse below the Theta Point.
Journal of Physical Chemistry. B 2017 October 13
We study the dynamics of a polymer chain with gradually changing the solvent quality from good to poor by dissipative particle dynamics simulation. We find several spectral modes related to internal motions of intrachain interaction. Approaching the coil-to-globule transition point, all fast modes of spectrum ω > 1 (ns)-1 disappear. There is only a slow mode at ω ≈ 0.66 (ns)-1 . Moreover, the spectral density at this slow mode reaches a maximum value at the transition point. We suggest that, at the transition point, the chain conformation relaxes to the most probable distribution only by the slow mode. There is a critical slowing down of internal motion with passing through the transition point.
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