Journal
LANGMUIR
Volume 34, Issue 43, Pages 12759-12763Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b02451
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB/TRR 102]
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We report the thin layer crystallization of high-molar mass poly(ethylene oxide) (PEO) on a liquid support using a 4 M K2CO3 aqueous solution as a subphase. Because of the Hofineister effect, PEO does not dissolve and remains at the surface during compression on a Langmuir trough. The transition from the flat pancake conformation upon compression of the spread polymer film to an entangled monolayer results in a plateau region of the Langmuir isotherm. Using grazing incidence wide-angle X-ray scattering, the final crystallization of PEO was observed, and the crystal orientation was determined. The fold surface was (20 (9) over bar), that is, the helix axis has a tilt angle of 2.9 degrees to the normal vector of the water surface.
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