Reduced Water Density in a Poly(ethylene oxide) Brush

Title
Reduced Water Density in a Poly(ethylene oxide) Brush
Authors
Hoyoung LeeDae Hwan KimHae-Woong ParkNathan A. MahynskiKyungil KimMati MeronBinhua Lin원유연
Issue Date
2012-03
Publisher
Journal of Physical Chemistry Letters
Citation
VOL 3, 1589-1595
Abstract
A model poly(ethylene oxide) (PEO) brush system, prepared by spreading a poly(ethylene oxide)−poly(n-butyl acrylate) (PEO−PnBA) amphiphilic diblock copolymer onto an air−water interface, was investigated under various grafting density conditions by using the X-ray reflectivity (XR) technique. The overall electron density profiles of the PEO−PnBA monolayer in the direction normal to the air−water interface were determined from the XR data. From this analysis, it was found that inside of the PEO brush, the water density is significantly lower than that of bulk water, in particular, in the region close to the PnBA−water interface. Separate XR measurements with a PnBA homopolymer monolayer confirm that the reduced water density within the PEO−PnBA monolayer is not due to unfavorable contacts between the PnBA surface and water. The above result, therefore, lends support to the notion that PEO chains provide a hydrophobic environment for the surrounding water molecules when they exist as polymer brush chains.
URI
http://pubs.kist.re.kr/handle/201004/43798
ISSN
19487185
Appears in Collections:
KIST Publication > Article
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