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Irreversible Adsorption of Polymer Melts

Published online by Cambridge University Press:  10 February 2011

U. Sawhney ,
C.J. Durning ,
B. O'Shaughnessy ,
G.S. Smith  and
J. Majewski
U. Sawhney
Affiliation:
Department of Chemical Engineering, Materials Science and Mining Engineering Columbia University, New York, NY 10027, USA
C.J. Durning
Affiliation:
Department of Chemical Engineering, Materials Science and Mining Engineering Columbia University, New York, NY 10027, USA
B. O'Shaughnessy
Affiliation:
Department of Chemical Engineering, Materials Science and Mining Engineering Columbia University, New York, NY 10027, USA
G.S. Smith
Affiliation:
MLNSC, Los Alamos National Laboratory, Los Alamos, NM 87545
J. Majewski
Affiliation:
MLNSC, Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

We studied the equilibrium architecture of polymer layers strongly adsorbed from the melt. Immobilized layers of poly-(methyl methacrylate) (PMMA) were produced by the following method: 1) The polymer was spin-coated onto silanol bearing surfaces of single crystal and fused quartz, and annealed at melt conditions, 2) The annealed layer was quenched to room temperature (below the glass transition temperature) in order to “freeze in” the melt structure near the substrate, 3) Unbound material was leached away in good solvent (benzene) to leave a residual, strongly-adsorbed layer. The architecture of this layer was studied by neutron reflection. Data on dried adsorbed layers indicates a dense PMMA film whose thickness gradually increases with annealing time in the melt from a minimal value. Evidently, annealing gradually relaxes a rather flat non-equilibrium structure produced by spin-coating. The thicknesses, h, in a series of dry layers annealed long enough to achieve equilibrium conditions in the melt scale as h ∼ N1/2. Data on swollen layers suggest a dilute, extended layer, but the preliminary results cannot give a definitive confirmation of the brush structure predicted by Guiselin.11

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 219
Copyright
Copyright © Materials Research Society 1997

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References

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