Enrichment depth profiles in polymer blends measured by forward recoil spectrometry
ABSTRACT A novel time‐of‐flight detector system for He+ forward recoil spectrometry which improves the depth resolution to better than 35 nm has been used to investigate the form of the surface enrichment profile in a protonated (normal) polystyrene (PS)/deuterated polystyrene (d‐PS) blend. The volume fraction ϕ of d‐PS depends on the depth z as ϕ(z)=ϕ ∞ +(ϕ 1 -ϕ ∞ ) exp(-z/ξ), where ϕ 1 and ϕ ∞ are the surface and bulk volume fractions of d‐PS, respectively, and ξ is approximately the bulk correlation length, as predicted by theory.
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ABSTRACT: Experimental research on wetting in polymer films is a subject that is reaching maturity. We review progress from the past few years in research into the influence of a boundary in polymer blends, concentrating largely on the wetting transition, and the growth of wetting layers, where we pay particular attention to blends in which hydrodynamic flow plays a dominant role. A summary of work over the same period concerning the dewetting of polymer films is also included, along with a discussion of the role of pattern formation caused by dewetting and topographically and chemically patterned substrates. We conclude by summarising some experiments that we believe may inspire future research.Progress in Polymer Science 01/2003; 28(2):261-302. · 26.38 Impact Factor
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ABSTRACT: Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2001. Includes bibliographical references (p. 235-255). Vita.