Abstract
The first vinyl organometallic monomer containing tungsten, (η6-vinylcyclopentadienyl)tricarbonylmethyltungsten (4), was homopolymerized and copolymerized with styrene, acrylonitrile, methyl methacrylate, and N-vinyl-2-pyrrolidone, using azobis(isobutyronitrile) (AIBN) as the initiator. Reactivity ratios for the styrene (M2) copolymerization of 4, initiated by AIBN in benzene solutions, were = 0.16 and r2 = 1.55 from which the Alfrey-Price parameters e = -1.98 and Q = 1.66 were calculated. Thus, (η5-vinylcyclopentadienyl)tricarbonylmethyltungsten is an exceptionally electron-rich vinyl monomer, closely resembling vinylferrocene, (η5-vinylcyclopentadienyl)tricarbonylmanganese, and (η5-vinylcyclopentadienyl) dicarbonylnitrosylchromium in this respect. This is the first vinyl monomer known to have an M-CH3 (M is a transition metal) bond. Styrene polymerizations in the presence of (η5-cyclopentadienyl)- tricarbonylmethyltungsten were carried out to evaluate the possibility that the methyl group is a good hydrogen atom donor (thereby serving as an inhibitor or a chain transfer agent). No evidence was obtained for significant chain transfer activity. Similarly, neither (η5-cyclopentadienyl)tricarbonylmanganese nor poly(η6-vinylcyclopentadienylRricarbonylmanganese acted as efficient chain transfer agents in styrene polymerizations.
Original language | English (US) |
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Pages (from-to) | 237-241 |
Number of pages | 5 |
Journal | Macromolecules |
Volume | 14 |
Issue number | 2 |
DOIs | |
State | Published - Mar 1981 |