Micelles of polybutadiene-b-poly(ethylene oxide) in a binary solvent system
by Ploetz, Christopher Daniel, M.S., UNIVERSITY OF MARYLAND, COLLEGE PARK, 2008, 136 pages; 1454329

Abstract:

We studied the assembly behavior of a polybutadiene-b-poly(ethylene oxide) diblock copolymer in methanol, cyclohexane, and the corresponding partially miscible binary solvent system. Dynamic light scattering indicates that the copolymer forms coexisting spherical and cylindrical micelles in both of the pure solvents. In the binary solvent system, spherical micelles form in the methanol-rich phase for a wide range of temperatures. Conversely, micelles are present in the cyclohexane-rich phase only near the critical temperature. At the critical solvent composition, micelles form in the single phase region above the critical temperature. Size exclusion chromatography results for the binary solvent system show that the copolymer generally prefers the methanol-rich phase. The preference becomes more pronounced as temperature decreases.

 
AdviserSandra C. Greer
SchoolUNIVERSITY OF MARYLAND, COLLEGE PARK
SourceMAI/ 47-01, p. , Oct 2008
Source TypeThesis
SubjectsPhysical chemistry; Polymer chemistry; Chemical engineering
Publication Number1454329
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