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The Volume Fraction Profile of Terminally Adsorbed Polymers

Published online by Cambridge University Press:  25 February 2011

R. J. Composto ,
T. Mansfield ,
G. Beaucage ,
R. S. Stein ,
D. R. Iyengar ,
T. J. Mc Carthy ,
S. K. Satija ,
J. F. Ankner  and
C. F. Majkrzak
R. J. Composto
Affiliation:
Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104
T. Mansfield
Affiliation:
Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003
G. Beaucage
Affiliation:
Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003
R. S. Stein
Affiliation:
Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003
D. R. Iyengar
Affiliation:
Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003
T. J. Mc Carthy
Affiliation:
Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003
S. K. Satija
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
J. F. Ankner
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
C. F. Majkrzak
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

We have used neutron reflectivity to measure the concentration profile of carboxylic acid-terminated polystyrene at the liquid/solid interface. Two isotopic systems were studied: (1) deuterated polystyrene (DPS) in cyclohexane and (2) polystyrene (PS) in deuterated cyclohexane. Although measured at 24°C (a poor solvent condition), the high grafting density of PS tethered chains causes the chains to weakly stretch to 3-5 times its unperturbed dimension. Although of similar molecular weight, the height of the DPS layer is about 50% higher than that of the PS. In both systems, the volume fraction of polymer near the wall is ∼ 0.60. For the DPS system, reflectivity profiles can be simulated using a parabolic profile with a depletion layer at the silicon-liquid interface. However, in the PS system, no depletion is observed. Here, the shape. of the PS concentration profile is parabolic with a rounded tail.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 407
Copyright
Copyright © Materials Research Society 1992

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