Copolymerization of ethylene with 4-methyl-1,3-pentadiene (4-MPD) catalyzed by 1,4- dithabutanediyl-linked bis(phenolato) titanium complexes 1 and 2 activated by methylaluminoxane (MAO) produced exclusively ethylene-4-MPD copolymers with high activity. The copolymer microstructure can be varied by changing the ratio between the monomers in the copolymerization feed, affording copolymers with 4-MPD content up to 83%. The resulting copolymer are crystalline as shown by thermal analysis and by the X-ray powder diffraction profiles. The microstructural features were fully elucidated by 13CNMRspectroscopy revealing that the copolymers with various 4-MPDcontent show a strong tendency to the alternating microstructure which was confirmed by the kinetic elaboration.
Copolymerization of Ethylene with 4-Methyl-1,3-pentadiene Promoted by Titanium Complexes Containing a Tetradentate [OSSO]-Type Bis(phenolato) Ligand
PROTO, Antonio;CAPACCHIONE, Carmine
2009-01-01
Abstract
Copolymerization of ethylene with 4-methyl-1,3-pentadiene (4-MPD) catalyzed by 1,4- dithabutanediyl-linked bis(phenolato) titanium complexes 1 and 2 activated by methylaluminoxane (MAO) produced exclusively ethylene-4-MPD copolymers with high activity. The copolymer microstructure can be varied by changing the ratio between the monomers in the copolymerization feed, affording copolymers with 4-MPD content up to 83%. The resulting copolymer are crystalline as shown by thermal analysis and by the X-ray powder diffraction profiles. The microstructural features were fully elucidated by 13CNMRspectroscopy revealing that the copolymers with various 4-MPDcontent show a strong tendency to the alternating microstructure which was confirmed by the kinetic elaboration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
