Wetting of heterogeneous surfaces of block copolymers containing fluorinated segments View Full Text


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Article Info

DATE

2001-08

AUTHORS

K. Grundke, D. Pospiech, W. Kollig, F. Simon, A. Janke

ABSTRACT

The wetting of well-characterized heterogeneous surfaces of block copolymers has been studied by low-rate dynamic contact angle measurements using axisymmetric drop-shape analysis. Atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) were used to investigate the roughness, the heterogeneity and the chemical composition of the surfaces. By changing the block length of polysulfone and semifluorinated polyester segments in the block copolymers, the surface heterogeneity of thin films prepared on silicon wafers could be controlled. Tapping-mode AFM measurements showed that soft, hydrophobic domains of varying size on the submicrometer length scale were obtained on these surfaces (60–250 nm). The mean roughness was of the order of several nanometers. The results of the contact angle measurements showed that neither roughness nor heterogeneity had a significant effect on the advancing contact angle of water, at the scale of the features present; however, the contact angle hysteresis increased with increasing percentage of the soft domains. We assume that liquid retention by the solid upon retraction of the three-phase line is the main cause for the observed increase in contact angle hysteresis. Concerning the molecular composition of these block copolymer surfaces, angle-resolved XPS analysis showed a surface segregation of fluorine within the surface region. A direct correlation was found between the fluorine content of the block copolymer surfaces and the advancing contact angle of water. More... »

PAGES

727-735

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s003960100487

DOI

http://dx.doi.org/10.1007/s003960100487

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047958803


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