Effect of an interactive surface on the equilibrium contact angles in bilayer polymer films
Scanning transmission X-ray microscopy (STXM), atomic force microscopy (AFM), near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, and photoemission electron microscopy (PEEM) were used to obtain the three-dimensional concentration profiles and the late-stage morphology of liquid bilayer thin films of the two immiscible polymers polystyrene (PS) and (polybromostyrene) (PBr{sub x=0.79}S), where x+ fraction of monomers brominated as a function of the lower PS film thickness. The results could not be explained with existing models developed for bulk viscoelastic fluids. The authors found that, for the case of entangled polymers, other factors such as the interfacial energy with the substrate, the film thickness, and the molecular weights must be considered. A model which includes a restoring force characterizing the change in stiffness of the substrate layer due to surface interactions provided good agreement with the experimental observations.
- Research Organization:
- State Univ. of New York, Stony Brook, NY (US)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE
- DOE Contract Number:
- FG02-93ER45481; FG02-89ER60858
- OSTI ID:
- 20017514
- Journal Information:
- Langmuir, Vol. 16, Issue 5; Other Information: PBD: 7 Mar 2000; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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