Journal
MACROMOLECULES
Volume 51, Issue 16, Pages 6312-6317Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.8b01193
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/I012060/1]
- EPSRC
- ERC [PISA: 320372]
- EPSRC [EP/I012060/1] Funding Source: UKRI
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The diffusion of rhodamine-labeled poly-(ethylene glycol) (r-PEG) within surface-grafted poly-(ethylene glycol) (s-PEG) layers in aqueous solution at 18 degrees C was measured by fluorescence correlation spectroscopy. The diffusion coefficient of r-PEG within s-PEG was controlled by the grafting density, sigma, and scaled as sigma(-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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