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

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

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

Author(s) -

Zhenyu J. Zhang,

Steve Edmondson,

Matthew Mears,

Jeppe Madsen,

Steven P. Armes,

Graham J. Leggett,

Mark Geoghegan

Publication year - 2018

Publication title -

macromolecules

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.994

H-Index - 313

eISSN - 1520-5835

pISSN - 0024-9297

DOI - 10.1021/acs.macromol.8b01193

Subject(s) - peg ratio , ethylene glycol , diffusion , fluorescence correlation spectroscopy , aqueous solution , chemistry , polymer chemistry , polymer , rhodamine , grafting , chemical engineering , analytical chemistry (journal) , fluorescence , materials science , chromatography , thermodynamics , organic chemistry , optics , molecule , physics , finance , economics , engineering

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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