COLL 104 |
| Thomas Joncheray1, Raju Francis2, Rachid Matmour2, Bénédicte Lepoittevin2, Daniel Taton2, Yves Gnanou3, and R. S. Duran1. (1) Butler Polymer Laboratory, Department of Chemistry, University of Florida, Gainesville, FL 36211, (2) Laboratoire de Chimie des Polymères Organiques, Université Bordeaux I, 16, Avenue Pey-Berland, Pessac, 33607, France, (3) Laboratoire de Chimie des Polymères Organiques, ENSCPB-CNRS Université Bordeaux I, 16, Avenue Pey-Berland, 33607 Pessac Cedex, France |
| We studied the self-assembly of two amphiphilic star architectures at the air-water interface. The mikto-arm star copolymer consists of one polystyrene (PS) chain and of two poly(t-butyl acrylate) (PtBA) chains while the dendrimer-like copolymer comprises an 8-arm PS core with a 16-arm PtBA corona. We used a Langmuir-Blodgett trough to prepare the monolayers and carry out isotherm, hysteresis, isobar and isochore experiments. We also transferred the films onto mica substrates to show surface-micelle formation through Atomic Force Microscopy. In comparing our results with linear PS-b-PtBA studied by Lennox et. al., we observed that the film behavior strongly depends on the architecture of the copolymers. Isotherm, hysteresis, isochore and isobar experiments were also strongly influenced by the compression speed for surface pressures above the pseudo-plateau, implying visco-elastic behavior. |
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Symposium in Memory of Arthur W. Adamson
8:30 AM-11:50 AM, Monday, March 29, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |