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Neutron Reflection Studies of Swelling of Chemically End-Grafted Polymer Chains

Published online by Cambridge University Press:  22 February 2011

Alamgir Karim ,
S.K. Satija ,
P. Gallagher ,
J.F. Douglas  and
L.J. Fetters
Alamgir Karim
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
S.K. Satija
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
P. Gallagher
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
J.F. Douglas
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
L.J. Fetters
Affiliation:
Exxon Research and Engineering Company, Annandale, NJ 08801
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Abstract

Neutron reflection is used to compare the swelling of two chemically end-grafted polystyrene brushes having different grafting densities exposed to a theta solvent cyclohexane and to a good solvent toluene. The relative swelling of tie brushes with a variation of solvent quality becomes smaller and the temperature dependence becomes weaker with an increase of grafting density. This type of swelling is very similar to polymer networks where an increase of cross-linking density leads to a decreased range of swelling and diminished dependence of the swelling. Our model density profile fits to the body of both brushes is parabolic in a good solvent so that some fluctuation effects, as found generally in lower density brushes, are obtained as the brush expands.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 229
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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