COLL 183 |
| Camille T. Haynes, School of Polymers and High Performance Materials, The University of Southern Mississippi, S.S. Box 10076, Hattiesburg, MS 39406 and Robert Y. Lochhead, School of Polymers and High Performance Materials, University of Southern Mississippi, Hattiesburg, MS 39406. |
| This study’s objective was to probe the mechanisms of interaction of model polyelectrolytes with montmorillonite clay. Polyvinylamine and its propoxybenzoyl substituted derivatives were chosen. The charge density of this cationic polyelectrolyte changes with pH of the aqueous medium and thus the polymer/substrate interactions could be modulated . Adsorption isotherms were generated and precise polymer group-montmorillonite interactions were identified by measuring the FTIR adsorption band frequency shift upon adsorption. Adsorbed polymer conformation was probed by measuring the peak width by 13C NMR. The interplatelet d-spacing of montmorillonite was measured by small-angle X-ray diffraction. Polyvinylamine homopolymers of average molecular weights in the vicinity of 100 kilodaltons adsorbed readily to the faces of sodium montmorillonite aggregates, but they did not penetrate the galleries. However, certain hydrophobically modified polyvinylamines spontaneously penetrated the galleries and caused large increases in the montmorillonite d spacing. |
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Posters: Fundamental Research in Surface and Colloid Chemistry
6:00 PM-8:00 PM, Monday, March 29, 2004 Disneyland -- North Exhibit Hall, Poster
Division of Colloid and Surface Chemistry |