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Reflectivity Studies on Adsorbed Block Copolymers Under Shear

Published online by Cambridge University Press:  22 February 2011

Gregory S. Smith ,
Stephen Wages ,
Shenda M. Baker ,
Chris Toprakcioglu  and
George Hadziioannou
Gregory S. Smith
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM
Stephen Wages
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM
Shenda M. Baker
Affiliation:
Harvey Mudd College, Claremont, CA
Chris Toprakcioglu
Affiliation:
University of Patras, Patras, Greece
George Hadziioannou
Affiliation:
University of Groningen, Groningen, Netherlands
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Abstract

We report neutron reflectivity data on (poly)styrene-(poly)ethylene oxide (PS-PEO) diblock copolymers adsorbed onto quartz from the selective solvent deuterated cyclohexane (a non-solvent for PEO and a poor solvent for PS). The PEO "anchor block" adsorbs strongly to form a thin layer on the quartz substrate, while the PS chains dangle into the solvent. We find that under static conditions the density profile of the PS block in a poor solvent can be well described by a Schultz function which is indicative of a polymer "mushroom." Furthermore, we have studied the same system under shear at shear rates from 0-400s-l. We find that there is a dramatic increase in the thickness of the PS layer under shear in cyclohexane and that the relaxation time from the shear-on profile back to the static profile is on the order of several days.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 223
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

1 Napper, D. H., “Polymeric Stabilization of Colloidal Dispersions,” Academic Press, London, 1983.Google Scholar
2 Alexander, S., J. Phys. (Paris), 38, 983(1977).Google Scholar
3 de Gennes, P.G., J. Phys (Paris), 37, 1445(1976).Google Scholar
4 de Gennes, P.G., Macromolecules, 13, 1069(1980).Google Scholar
5 S.T, Milner, Witten, T. A., and Cates, M.E., Macromolecules, 21, 2610(1988).Google Scholar
6 Whitmore, M.D. and Noolandi, J., Macromolecules, 23, 3321(1990).Google Scholar
7 Muthukumar, M. and Jyh-Shyong, HO, Macromolecules, 22,965(1989).Google Scholar
8 Barrât, J.-L., Macromolecules, 25, 832(1992).Google Scholar
9 Zhulina, E.B. and Pakula, T., Macromolecules, 25, 754(1992).Google Scholar
10 Williams, D.R.M., Macromolecules, 26, 5806(1993).Google Scholar
11 Field, J.B., Toprakcioglu, C., Ball, R.C., Stanley, H. B., Dai, L., Barford, W., Penfold, J., Smith, G. S., and Hamilton, W., Macromolecules, 25, 434(1992).Google Scholar
12 Field, J. B., Toprakcioglu, C., Dai, L., Hadziioannou, G., Smith, G.S., and Hamilton, W., J. Phys. II, 2, 2221(1992).Google Scholar
13 Baker, S. M., Smith, G.S., Pynn, R., Butler, P., Hayter, J., Hamilton, W., and Magid, L., Rev. Sci. Instrum., 65 (2), 412(1994).Google Scholar
14 Cohen, Y., Macromolecules, 21, 494(1988).Google Scholar