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Updated: Feb 5, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Blob Size Controls Diffusion of Free Polymer in a Chemically Identical Brush in Semidilute Solution
Zhenyu J Zhang1,2, Steve Edmondson3, Matthew Mears1
1Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, U.K.
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.
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