Authors Su, C.-F. ; Cui, W. ; Merlitz, H. ; Wu, C.-X. ; Sommer, J.-U.
Title Starlike polymer brushes in q-solvent
Date 19.06.2014
Number 42906
Abstract The properties of starlike polymer brushes in T-solvent are investigated using molecular dynamics simulations, scaling- and mean-field theory. Deviations of layer thickness and monomer density from predictions of scaling theory are analyzed and explained. Contrary to common believes, we conclude that the Alexander-deGennes scaling theory is not valid for starlike polymer brushes in T-solvent, unless the grafting density is extremely low. A comparison with structural and dynamical properties of starlike polymer brushes in good solvent is carried out. Previous studies in good solvent reported about the dual-population structure of these branched polymer brushes, with coexisting phases of stretched and retracted molecules; the same separation emerges in T-solvent, though at higher grafting densities. Molecular tension and population fractions are shown to be solvent-dependent, and a reduced dynamical flip-rate between the two populations is observed for the case of the T-brush.
Publisher Polymer
Citation Polymer 55 (2014) 3254-3260
Tags starlike polymer brushes md simulation mean-field theory

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