Nonequilibrium polymer chains induced by conformational transitions in densely interfacial layers

Nonequilibrium poly(N-isopropylacrylamide) (PNIPAM) chains are generated by temperature-induced conformational transitions in the densely interfacial PNIPAM layer at high adsorbed amounts in aqueous solution. The interleaving chains relax in a spatially heterogeneous space of adsorbed layer which is...

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Published in:The Journal of chemical physics 2012-09, Vol.137 (10), p.104903-104903
Main Author: Zhu, Peng-Wei
Format: Article
Language:English
Subjects:
Acrylamides - chemistry
Acrylic Resins
Adsorption
Aqueous solutions
Barriers
Chains (polymeric)
Density
Dynamics
Hydrodynamics
Hydrogen bonding
Kinetics
Molecular Conformation
Origins
Polymers - chemistry
Segments
Solutions
Temperature
Water - chemistry
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description Nonequilibrium poly(N-isopropylacrylamide) (PNIPAM) chains are generated by temperature-induced conformational transitions in the densely interfacial PNIPAM layer at high adsorbed amounts in aqueous solution. The interleaving chains relax in a spatially heterogeneous space of adsorbed layer which is filled with the domains via the hydrogen bonding and hydrophobic interactions. The relaxation dynamics of interleaving chains is changed from the weekly stretched exponential behaviour at the lower adsorbed amount to the strongly stretched exponential behaviour at the higher adsorbed amount. The kinetic constraints for the relaxation dynamics depend on the segment density of the adsorbed layer which is controlled by the temperature. The stretched exponential relaxation is related to an ensemble of relaxations confined in the domains with different physical origins for the heterogeneous dynamics. The range of energy barriers for the relaxation is estimated from the stretched exponent based on the random first order transition theory.
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subjects Acrylamides - chemistry
Acrylic Resins
Adsorption
Aqueous solutions
Barriers
Chains (polymeric)
Density
Dynamics
Hydrodynamics
Hydrogen bonding
Kinetics
Molecular Conformation
Origins
Polymers - chemistry
Segments
Solutions
Temperature
Water - chemistry
title Nonequilibrium polymer chains induced by conformational transitions in densely interfacial layers
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