Blob size controls diffusion of free polymer in a chemically identical brush in semidilute solution

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

doi:10.1021/acs.macromol.8b01193

Blob size controls diffusion of free polymer in a chemically identical brush in semidilute solution

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

Chemical Engineering

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Abstract

The diffusion of rhodamine-labeled poly(ethylene glycol) (r-PEG) within surface grafted poly(ethylene glycol) (s-PEG) layers in aqueous solution at 25C was measured by fluorescence correlation spectroscopy. The diffusion coefficient of r-PEG within s-PEG was controlled by the grafting density, and scaled as 􀀀1:420:09. 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 semi-dilute solution were found to be similar to those in the brushes.

Original language	English
Pages (from-to)	6312-6317
Journal	Macromolecules
Volume	51
Issue number	16
Early online date	10 Aug 2018
DOIs	https://doi.org/10.1021/acs.macromol.8b01193
Publication status	Published - 28 Aug 2018

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title = "Blob size controls diffusion of free polymer in a chemically identical brush in semidilute solution",

abstract = "The diffusion of rhodamine-labeled poly(ethylene glycol) (r-PEG) within surface grafted poly(ethylene glycol) (s-PEG) layers in aqueous solution at 25C was measured by fluorescence correlation spectroscopy. The diffusion coefficient of r-PEG within s-PEG was controlled by the grafting density, and scaled as 􀀀1:420:09. 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 semi-dilute solution were found to be similar to those in the brushes.",

author = "Zhenyu Zhang and Steve Edmondson and Matthew Mears and Jeppe Madsen and Armes, {Steven P.} and Leggett, {Graham J.} and Mark Geoghegan",

year = "2018",

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doi = "10.1021/acs.macromol.8b01193",

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T1 - Blob size controls diffusion of free polymer in a chemically identical brush in semidilute solution

AU - Zhang, Zhenyu

AU - Edmondson, Steve

AU - Mears, Matthew

AU - Madsen, Jeppe

AU - Armes, Steven P.

AU - Leggett, Graham J.

AU - Geoghegan, Mark

PY - 2018/8/28

Y1 - 2018/8/28

N2 - The diffusion of rhodamine-labeled poly(ethylene glycol) (r-PEG) within surface grafted poly(ethylene glycol) (s-PEG) layers in aqueous solution at 25C was measured by fluorescence correlation spectroscopy. The diffusion coefficient of r-PEG within s-PEG was controlled by the grafting density, and scaled as 􀀀1:420:09. 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 semi-dilute solution were found to be similar to those in the brushes.

AB - The diffusion of rhodamine-labeled poly(ethylene glycol) (r-PEG) within surface grafted poly(ethylene glycol) (s-PEG) layers in aqueous solution at 25C was measured by fluorescence correlation spectroscopy. The diffusion coefficient of r-PEG within s-PEG was controlled by the grafting density, and scaled as 􀀀1:420:09. 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 semi-dilute solution were found to be similar to those in the brushes.

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SP - 6312

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JO - Macromolecules

JF - Macromolecules

IS - 16

ER -

Blob size controls diffusion of free polymer in a chemically identical brush in semidilute solution

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