Surface interaction in solvent-cast polystyrene-poly(methyl methacrylate) diblock copolymers

The relative surface coverage of components of a series of symmetric polystyrene/poly(methyl methacrylate) (PS/PMMA) diblock copolymers solution cast from toluene was studied by X-ray photoelectron spectroscopy. The copolymers, which ranged in total molecular weight from 27 000-535 000, are micropha...

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Bibliographic Details
Published in:Macromolecules 1989-05, Vol.22 (5), p.2189-2194
Main Authors: Green, Peter F, Christensen, Thomas M, Russell, Thomas P, Jerome, Robert
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Surface properties
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Summary:The relative surface coverage of components of a series of symmetric polystyrene/poly(methyl methacrylate) (PS/PMMA) diblock copolymers solution cast from toluene was studied by X-ray photoelectron spectroscopy. The copolymers, which ranged in total molecular weight from 27 000-535 000, are microphase separated into domains of pure PS and pure PMMA. The surface energy of PS is a fraction of a dyne per centimeter less than that of PMMA. The surface composition of PS, Phi sub PS , was in excess of its bulk value of 50% and increased as the total molecular weight of the copolymer, N, increased. This dependence could be described by an equation of the form Phi sub PS = a--bN exp --1/2 where a and b are constants. Spectra, graphs. 20 ref.--AA
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00195a033