TY - JOUR
T1 - Cyclopolymerization of 1,7-octadiene with metallocene/ methylaluminoxane
AU - Naga, Naofumi
AU - Shiono, Takeshi
AU - Ikeda, Tomiki
PY - 1999/6
Y1 - 1999/6
N2 - Polymerization of 1,7-octadiene was conducted with isospecific rac-dimethylsilylenebis(indenyl)zirconium dichloride (1), syndiospecific diphenylmethylene(cyclopentadienyl)(9-fluorenyl)zirconium dichloride (2) and aspecific bis(cyclopentadienyl)zirconium dichloride (3) metallocene catalysts combined with methylaluminoxane. The microstructure of the poly(1,7-octadiene)s produced was characterized by means of 1H NMR, 13C NMR and DEPT (distortionless enhancement by polarization transfer) spectroscopy. A portion of monomeric units in poly(1,7-octadiene)s is saturated as a result of cycloaddition. The fraction of the saturated units (cyclization selectivity) decreases in the following order: 1 > 3 > 2. The effect of polymerization temperature was studied, and the cyclization selectivity was found to decrease with lowering the polymerization temperature. The monomer concentration affects the microstructure of poly (1,7-octadiene), and the cyclization selectivity is drastically decreased with increasing monomer concentration.
AB - Polymerization of 1,7-octadiene was conducted with isospecific rac-dimethylsilylenebis(indenyl)zirconium dichloride (1), syndiospecific diphenylmethylene(cyclopentadienyl)(9-fluorenyl)zirconium dichloride (2) and aspecific bis(cyclopentadienyl)zirconium dichloride (3) metallocene catalysts combined with methylaluminoxane. The microstructure of the poly(1,7-octadiene)s produced was characterized by means of 1H NMR, 13C NMR and DEPT (distortionless enhancement by polarization transfer) spectroscopy. A portion of monomeric units in poly(1,7-octadiene)s is saturated as a result of cycloaddition. The fraction of the saturated units (cyclization selectivity) decreases in the following order: 1 > 3 > 2. The effect of polymerization temperature was studied, and the cyclization selectivity was found to decrease with lowering the polymerization temperature. The monomer concentration affects the microstructure of poly (1,7-octadiene), and the cyclization selectivity is drastically decreased with increasing monomer concentration.
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U2 - 10.1002/(SICI)1521-3935(19990601)200:6<1466::AID-MACP1466>3.0.CO;2-N
DO - 10.1002/(SICI)1521-3935(19990601)200:6<1466::AID-MACP1466>3.0.CO;2-N
M3 - Article
AN - SCOPUS:0001168537
VL - 200
SP - 1466
EP - 1472
JO - Macromolecular Chemistry and Physics
JF - Macromolecular Chemistry and Physics
SN - 1022-1352
IS - 6
ER -