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- W2536695770 abstract "The persistence length is a key parameter for the quantitative interpretation of the flexibility of polymers. We have studied complexes composed of a spherical poly(N-isopropylacrylamide) (PNIPAM) brush and a sodium dodecyl sulfate micelle in an effort to characterize the flexibility of tethered PNIPAM below the lower critical solution temperature TLCST. An analytical mean-field model is used to describe the persistence length Lp in a broad range of ψ, the number of bound micelles per chain. The persistence length of micelle-constrained PNIPAM is quantitatively correlated with the thermal energy kBT, electrostatic repulsion fC, and effective excluded-volume parameter νeff. The persistence length per ψ, which depends on T and fC, is found to scale with a synergistic effect fC/(ψkBT). The results reveal that the bound-micelle charges affecting the persistence length are analogous to the fixed charges of polyelectrolytes, though the bound micelles are separated by a large number of neutral monomers. The extension ⟨L⟩ of micelle-constrained PNIPAM decreases as ⟨L⟩ ∼ fC-βF with fC, where βF ≈ 0.58-0.8 depending on ψ, but as the universal power law ⟨L⟩ ∼ (fC/kBT)-0.6 with the synergistic effect fC/(kBT), irrespective of ψ. In spite of the intricate interplay among the multiple components in the system, the extension scales as a function of νeff as ⟨L⟩ ∼ (νeff/ψLp)-βV, where βV ≈ 0.35 for the significant monomer interaction and βV ≈ 0.2 for the weak or negligible monomer interaction." @default.
- W2536695770 created "2016-10-28" @default.
- W2536695770 creator A5025853223 @default.
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- W2536695770 date "2016-10-27" @default.
- W2536695770 modified "2023-10-14" @default.
- W2536695770 title "Synergistic Effects of Bound Micelles and Temperature on the Flexibility of Thermoresponsive Polymer Brushes" @default.
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- W2536695770 doi "https://doi.org/10.1021/acs.jpcb.6b08696" @default.
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