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Light Scattering Studies of the State of Dispersion in Molecular Composites

Published online by Cambridge University Press:  21 February 2011

Benjamin S. Hsiao ,
Richard S. Stein  and
Silvie Cohen Addad
Benjamin S. Hsiao
Affiliation:
Polymer Research Institute, University of Massachusetts, Amherst, MA 01003
Richard S. Stein
Affiliation:
Russell Gaudiana and Norman Weeks, Polaroid Corporation, Cambridge, MA 02139
Silvie Cohen Addad
Affiliation:
Russell Gaudiana and Norman Weeks, Polaroid Corporation, Cambridge, MA 02139
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Abstract

Polymer solutions comprising stiff-chain polyester and flexible polysulfone were examined via light scattering techniques. Results were analyzed using the Stein-Wilson extension of the Debye-Bueche theory, in which the correlation lengths due to orientation fluctuations and mean-squared fluctuations of the molecular anisotropy were obtained. For a molecular dispersion, the correlation length is small and a function of concentration; as the anisotropy is attributed to the rod molecules. Aggregation of rods is associated with an increase in the magnitude and size of the density fluctuations, and a change in anisotropy fluctuations is dependent on the degree of orientation correlation of the rods in the aggregate. Blends prepared by solution casting were studied by a small-angle light scattering method. Results thus far demonstrate that aggregates are present in most of the rod/coil composites prepared.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 171: Symposium O – Polymer Based Molecular Composites , 1989 , 125
Copyright
Copyright © Materials Research Society 1990

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References

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