POLY 48 |
| Heterogeneous catalytic hydrogenation of Poly(2-vinylpyridine) ,(P2VP) and Poly(4-vinylpyridine), (P4VP) was successfully accomplished using various group VIII metals supproted on carbon at relatively mild conditions. Among the catalysts used, Rh/C and Pd/C were very effective in either methanol or aqueous media. Under these conditions, there was no sign of chain degradation upon hydrogenation reaction. The saturated polymers P2VPip and P4VPip show high solubility to water as well as some polar organic solvents. Incorporation of secondary amine group to polymer chain makes the further functionalization easier. The glass transition temperatures of P2VPip and P4VPip were found using DSC to be 136°C and 176°C respectively which are 33°C and 24°C higher than the precursor polymers. The decomposition temperatures of P2VPip and P4VPip were 40°C higher. The improved thermal and oxidative stability of polyvinylpyridines are analogous to Polyvinylcyclohexane which is hydrogenated Polystyrene. |
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General Papers: Synthesis and Characterization
8:00 AM-11:40 AM, Sunday, 10 September 2006 San Francisco Marriott -- Nob Hill A, Oral
Division of Polymer Chemistry |