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Tuning Substrate Surface Energies for Blends of Polystyrene and Poly(methyl methacrylate)

Summary: Tuning Substrate Surface Energies for Blends of
Polystyrene and Poly(methyl methacrylate)
D. A. Winesett,, S. Story, J. Luning, and H. Ade*,
Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202,
and Stanford Synchrotron Radiation Laboratory, P.O. Box 20450, MS 69,
Stanford, California 94309-0210
Received March 31, 2003. In Final Form: June 30, 2003
We compare the efficacies of three preparation methods intended to create in an easy and inexpensive
way a nonpreferential surface for a two-component homopolymer blend of polystyrene and poly(methyl
methacrylate). The first method is to physically absorb two different high molecular weight copolymers
bonding octyltrichlorosilane onto hydroxylated silicon oxide with gradient coverage to create a region with
a neutral surface. The third method utilizes hydroxyl terminated, miscible, low molecular weight
homopolymers of polystyrene and poly(methyl methacrylate) covalently attached to the substrate. We
characterize the relative effectiveness of all three methods and their temporal stability using optical
microscopy, atomic force microscopy, contact angle measurements, as well as near edge X-ray absorption
fine structure (NEXAFS) microscopy and spectroscopy. The preparation methods explored should be
extendable to a number of polymer systems.
Polymer blends at elevated temperatures are viscous


Source: Ade, Harald W.- Department of Physics, North Carolina State University


Collections: Physics