Structures of branched poly(styrene-b-tert-butyl acrylate) prepared by ATRP from a poly(propylene imine)(NH2)64 core

POLY 502

Young Hie Kim, Deprtment of Chemistry, Oklahoma State University, Physical Sciences 107, Stillwater, OK 74078, Warren T. Ford, Warren.ford@okstate.edu, Department of Chemistry, Oklahoma State University, Physical Sciences 107, Stillwater, OK 74078, and Thomas H. Mourey, thomas.mourey@kodak.com, Foundation Science and Technology Center, Eastman Kodak Company, Research Laboratories, Rochester, NY 14650-2136.
The end groups of the poly(propylene imine) dendrimer PPI(NH2)64 were converted to 2-bromoisobutyramides for atom transfer radical polymerization (ATRP), and blocks of polystyrene (PS) and poly(tert-butyl acrylate) (PTBA) were grown by ATRP. The PTBA blocks were converted to poly(acrylic acid) (PAA) to give branched amphiphilic PS-PAA block copolymers. Size exclusion chromatographic analyses of the PS-PTBA materials showed that they have far fewer than 64 branches and fit a model having 15 PS branches and 5 PTBA branches. Dynamic light scattering measurements of DMF and DMF-water solutions of the block copolymers show multimodal aggregates. Atomic force microscopy images of the PS-PTBA block copolymers spin coated from THF and DMF and of the PS-PAA block copolymers spin coated from DMF-water mixtures show aggregates that spread to less than a monolayer.
 

Nanoparticles and Microparticles: Synthesis and Applications
6:00 PM-8:00 PM, Tuesday, 12 September 2006 Moscone Center -- Hall D, Poster

Division of Polymer Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006