Abstract
A COMPOSITIONAL STUDY OF THE MORPHOLOGY OF 18-ARMED POLY (STYRENE-ISOPRENE ) STAR-BLOCK COPOLYMERS SEPTEMBER 1986 DOREEN SUE HERMAN B.S., UNIVERSITY OF PENNSYLVANIA M.S., UNIVERSITY OF MASSACHUSETTS Directed by: Professor Edwin L. Thomas This research explored the morphology of a series of 18 arm poly(styrene-isoprene) star-diblock copolymers as a function of the arm composition. Samples with composition increments of 10% polystyrene (PS) between 10 to 90* PS were examined with a closer look in the neighborhood of 30* PS. Samples were dissolved in toluene and slow cast into films 0.75 to 1.5 mm thick. Osmium tetraoxide staining provided contrast of cyromicrotomed sections for examination with a JEOL 100CX transmission electron microscope. The ordered bicontinuous double diamond (OBDD) structure was observed for the 33 and 3S% PS samples. All other samples exhibited those morphologies (spheres, cylinders or lamellae) expected for linear diblock samples of the same composition.
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