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• W2010398011 abstract "In the present work, we consider polydispersity effects on a mixed polymer brush. Two types of polymer chains with different solvent selectivity being densely grafted together onto an impenetrable surface are forming a binary mixed polymer brush. Using a numerical quasi off-lattice self-consistent field method for heterogeneous chains we study the brush profile upon varying the strength of solvent selectivity (e.g., temperature) and the degree of polymerization of the two chain types (N1 and N2, respectively). For a monodisperse brush (N1 = N2) it is well-known, that the two types of polymers segregate into a two-layer structure, if the difference in solvent selectivity is increased. The state where the chains exposed to their good solvent forming the top layer of the brush can be frustrated for shorter chains and an inversion of the layering takes place. In the inverted state, the top layer is formed by long chains exposed to poor solvent covering the layer of shorter chains. By varying the solvent selectivity of the long chains we show that coexistence of the two states occurs,which indicates a discontinuous phase transition scenario for the switching process. We consider further the case of a very low fraction of short chains and find these chains to undergo a conformational transition of first order from a coil state, found deep inside the compact brush layer, to a flower state, stretching to the top of the brush upon varying the strength of the solvent selectivity. At the transition both states are found to be quasi-stable with an energy barrier of the order of the chain length in units of kBT. The discontinuous nature of the switching process by combining solvent selectivity and bidispersity can be of high interest for the creation of stimuli-responsive surfaces." @default.
• W2010398011 created "2016-06-24" @default.
• W2010398011 creator A5031277359 @default.
• W2010398011 creator A5055541111 @default.
• W2010398011 date "2015-02-27" @default.
• W2010398011 modified "2023-09-23" @default.
• W2010398011 title "Binary and Bidisperse Polymer Brushes: Coexisting Surface States" @default.
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• W2010398011 doi "https://doi.org/10.1021/am507959k" @default.
• W2010398011 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25723841" @default.
• W2010398011 hasPublicationYear "2015" @default.
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