PMSE 106 |
| Two acid-labile acetal-based dimethacrylate cross-linkers, di(methacryloyloxy-1-ethoxy)methane (DMOEM) and (methacryloyloxy-1-ethoxy)methylether (MOEME) were synthesized by the reaction of 2-hydroxyethyl methacrylate and paraformaldehyde. Group transfer polymerization was employed to use these cross-linkers for the preparation of star polymers of methyl methacrylate (MMA). Characterization of the star polymers containing DMOEM and MOEME cross-linkers in THF using static light scattering and GPC showed that their MWs and their number of arms were much lower than those of the non-hydrolyzable EGDMA cross-linker due to the relative bulkiness of the acetal cross-linkers. Dynamic light scattering of the star polymers in THF provided hydrodynamic diameters in the range between 8 and 180 nm, including star aggregates. The hydrolysis kinetics of the acetal cross-linkers and their star polymers in solutions of hydrochloric acid were followed by proton nuclear magnetic resonance spectroscopy and GPC, respectively. The hydrolyses of DMOEM and its star polymers occur relatively faster than MOEME. |
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Polymers, Nanoparticles and Composite Materials in Nanoscience
1:30 PM-4:50 PM, Monday, 27 March 2006 OMNI at CNN Center -- Intl. Blrm D, Oral
Division of Polymeric Materials: Science and Engineering |