COLL 118 |
| Jennifer Logan1, Brian Dorvel1, Raju Francis2, and Randolph S. Duran1. (1) Butler Polymer Laboratory, Department of Chemistry, University of Florida, Gainesville, FL 32611, (2) Department of Chemistry, St. Joseph's College, University of Calicut, Calicut, Kerala, 673008, India |
| A series of novel architectures of polystyrene (PS) and poly(ethylene oxide) (PEO) diblock copolymers were examined using Atomic Force Microscopy (AFM). The polymers in question were 2-4 arm stars with either a PS core/PEO corona or the reverse PEO core/PS corona. In addition, dendrimeric stars in which two PEO chains branched from the end of the core PS arms were studied. The PS-PEO stars were spread as thin films at the air/water interface on a Langmuir trough and transferred to mica at various surface pressures. For PS core/PEO corona stars, nanometer-thick circular domains of aggregated molecules were observed and found to depend on compression pressure. Domains were observed to reproducibly chain under certain conditions to form mesoscopic string-like morphologies. In contrast, the PEO core/PS corona stars demonstrated a variety of morphologies, independent of pressure but due to large amounts of PS. |
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Nanoscience and Nanotechnology
8:30 AM-11:45 AM, Monday, March 29, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |