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

Lookup NU author(s): Professor Mark GeogheganORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© Copyright 2018 American Chemical Society. 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.

Publication metadata

Author(s): Zhang ZJ, Edmondson S, Mears M, Madsen J, Armes SP, Leggett GJ, Geoghegan M

Publication type: Article

Publication status: Published

Journal: Macromolecules

Year: 2018

Volume: 51

Issue: 16

Pages: 6312-6317

Online publication date: 10/08/2018

Acceptance date: 26/07/2018

Date deposited: 19/12/2019

ISSN (print): 0024-9297

ISSN (electronic): 1520-5835

Publisher: American Chemical Society


DOI: 10.1021/acs.macromol.8b01193


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