Microstructures in Polymer Systems Containing Block Copolymers and/or Polyelectrolytes

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This research deals with polymer colloids and conducting polymers in solution. Studies on the block copoly(oxy- ethylene/oxypropylene/oxyethylene) will be carried out in the more difficult experimental range where multiple scattering could become a serious problem. The idea is to use very thin (0.1-0.5 mm) light-scattering cells and longer wavelength (ca. 0.8 micron), as well as small-angle x-ray scattering (SAXS) by means of a Bonse-Hart apparatus and possibly with the aid of synchrotron radiation. The purposes of the polymer colloid studies are several-fold, including methodology for characterization of micro-emulsions or micelles with specific interacting groups. For conducting polymers, the interesting phenomenon of charged rod aggregation in dilute solution is to be studied. Electrophoretic separation coupled with kinetic studies on the color change and the aggregation process may lead toward a better understanding on how color change and aggregation are related.