Preparation of Nanosilica/Polynorbornene Nanocomposite by Covalently Immobilized Silica-Supported Acetylacetonate Palladium(II) Dichloride Catalyst
(2378–2388)  Macromolecular Chemistry and Physics 212 #21 (2011)
Yuan et al of Nanchang University, China, prepared covalently immobilized silica-supported acetylacetonate dichloride palladium(II) precatalyst by the reaction of silica particles grafted acetylacetonate ligand further exchange with [Et4N]2PdCl4. The silica-supported catalyst is used in slurry polymerizations of norbornene (NB) to afford a highly productive NB addition polymerization system in combination with B(C6F5)3 cocatalyst. The obtained vinyl-type polynorbornene is confirmed to be nanosilica hybrid PNB nanocomposite by SEM, TEM with an energy dispersive spectrometer, TGA, and XRD.  (RDC 11/3/2011)