Blob Size Controls Diffusion of Free Polymer in a Chemically Identical Brush in Semidilute Solution

Zhenyu J. Zhang, Steve Edmondson, Matthew Mears, Jeppe Madsen, Steven P. Armes, Graham J. Leggett, Mark Geoghegan

Research output: Contribution to journalArticlepeer-review

Abstract

The diffusion of rhodamine-labeled poly(ethylene glycol) (r-PEG) within surface-grafted poly(ethylene glycol) (s-PEG) layers in aqueous solution at 18 °C was measured by fluorescence correlation spectroscopy. The diffusion coefficient of r-PEG within s-PEG was controlled by the grafting density, σ, and scaled as σ–1.42±0.09. It is proposed that a characteristic blob size associated with the grafted (brush) layer defines the region through which the r-PEG diffusion occurs. The diffusion coefficients for r-PEG in semidilute solution were found to be similar to those in the brushes.
Original languageEnglish
Pages (from-to)6312-6317
JournalMacromolecules
Volume51
Issue number16
Early online date10 Aug 2018
DOIs
Publication statusPublished - 28 Aug 2018

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