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Light Scattering Studies of the State of Dispersion in Molecular Composites

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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.

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Author notes

  1. Benjamin S. Hsiao

    Present address: Fibers Department, E. I. du Pont de Nemours Co. Inc., 19880-0302, Wilmington, DE, USA

  2. Richard S. Stein & Silvie Cohen Addad

    Present address: College de France, Paris, France

Authors and Affiliations

  1. Polymer Research Institute, University of Massachusetts, 01003, Amherst, MA, USA

    Benjamin S. Hsiao

  2. Russell Gaudiana and Norman Weeks, Polaroid Corporation, 02139, Cambridge, MA, USA

    Richard S. Stein & Silvie Cohen Addad

Authors
  1. Benjamin S. Hsiao
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  2. Richard S. Stein
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  3. Silvie Cohen Addad
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Hsiao, B.S., Stein, R.S. & Addad, S.C. Light Scattering Studies of the State of Dispersion in Molecular Composites. MRS Online Proceedings Library 171, 125–130 (1989). https://doi.org/10.1557/PROC-171-125

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  • DOI: https://doi.org/10.1557/PROC-171-125

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