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Shear Induced Phase Behavior of Polymer Blends by Small Angle Neutron Scattering

Published online by Cambridge University Press:  21 February 2011

Alan I. Nakatani ,
Hongdoo Kim  and
Charles C. Han
Alan I. Nakatani
Affiliation:
National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Hongdoo Kim
Affiliation:
National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Charles C. Han
Affiliation:
National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
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Abstract

The phase behavior of polymer blends and solutions can be changed dramatically by a flow field using a variety of flow geometries. Unlike simple binary fluids which require extremely high shear rates to produce only small shifts in the phase boundary, polymer phase behavior may be influenced by as much as 10 degrees with the application of much lower shear rates. However, there is a large body of conflicting data concerning the nature of these shear effects in polymers.

Here we report on the effects of shear on the phase behavior of polymer blends by small angle neutron scattering (SANS). Experiments were conducted using a specially constructed, concentric cylinder apparatus for in situ studies of concentrated polymer solutions and melts. Two separate systems will be discussed: 1) a blend of polystyrene and polybutadiene. 2) a blend of polystyrene and poly(vinylmethylether). Both systems exhibit shifts in the phase behavior which indicate shear induced mixing in agreement with previous results obtained by other techniques. These results will be interpreted within the context of existing theories of shear induced phase behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 479
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1) Ferrell, R., Phys. Rev. Lett., 1970, 24, 1122.CrossRefGoogle Scholar
2) Kawasaki, K.; “Phase Transitions and Critical Phenomena”, ed. by Domb, C. and Green, M.S., Vol. 5a, Academic Press, New York, 1976.Google Scholar
3) Onuki, A.; Yamazaki, K.; Kawasaki, K. Ann. Phys. 1981, 131, 217.CrossRefGoogle Scholar
4) Imaeda, T.; Onuki, A.; Kawasaki, K. Prog. Theor. Phys. 1984, 71, 16.CrossRefGoogle Scholar
5) Rangel-Nafaile, C.; Metzner, A. B.; Wissbrun, K. F. Macromolecules 1984, 17, 1187.CrossRefGoogle Scholar
6) Tirrell, M.; Fluid Phase Eguil. 1986, 30, 367.CrossRefGoogle Scholar
7) deGennes, P. G. “Scaling Concepts in Polymer Physics” Cornell University Press, Ithaca, New York, 1979.Google Scholar
8) Matsushita, Y.; Furuhashi, H.; Choshi, H.; Noda, I.; Nagasawa, M., Fujimoto, T.; Han, C. C. Polymer J. 1982, 14, 489.CrossRefGoogle Scholar
9) Bauer, B. J.; Hanly, B.; Muroga, Y. Polymer Commun. 1989, 30, 19.Google Scholar
10) Han, C.C.; Bauer, B. J.; Clark, J. C.; Muroga, Y.; Matsushita, Y.; Okada, M.; Tran-cong, Q.; Chang, T.; Sanchez, I. C. Polymer, 1988, 29, 2002.CrossRefGoogle Scholar
11) Certain equipment, instruments or materials are identified in this paper in order to adequately specify the experimental details. Such identification does not imply recommendation by the National Institute of Standards and Technology nor does it imply the materials are necessarily the best available for the purpose.Google Scholar
12) Nakatani, A. I.; Kim, H.; Han, C. C. submitted to J. of Res. of NISTGoogle Scholar
13) Mazich, K. A.; Carr, S. H. J. Appl. Phys, 1983, 54, 5511.CrossRefGoogle Scholar
14) Ajji, A.; Choplin, L.; Prud'homme, R. E. J. Polym. Sci. Polym. Phys. Ed. 1988, 26, 2279.CrossRefGoogle Scholar
15) Cheikh, Larbi F. B.; Malone, M. F.; Winter, H. H.; Halary, J. L.; Leviet, M. H.; Monnerie, L. Macromolecules 1988, 21, 3532.Google Scholar
16) Nakatani, A. I.; Kim, H.; Takahashi, Y.; Han, C. C. Polym. Comm. 1989, 30, 143.Google Scholar
17) See for example: Tanford, C. “Physical Chemistry of Macromolecules”, John Wiley and Sons, New York, 1961, pp 432–451.Google Scholar
18) Hashimoto, T.; Takebe, T.; Suehiro, S. Polymer J. 1986, 2, 123.CrossRefGoogle Scholar
19) Hashimoto, T.; Takebe, T.; Suehiro, S. J. Chem. Phys. 1988, 88, 5874.Google Scholar
20) Onuki, A. J. Chem. Phys. 1986, 85, 1122.Google Scholar
21) Full manuscript is in preparation.Google Scholar