Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 1466-1472 |
| Number of pages | 7 |
| Journal | Macromolecular Chemistry and Physics |
| Volume | 200 |
| Issue number | 6 |
| Publication status | Published - 1999 Jun |
| Externally published | Yes |
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ASJC Scopus subject areas
- Organic Chemistry
- Physical and Theoretical Chemistry
- Materials Chemistry
- Polymers and Plastics
Cite this
Cyclopolymerization of 1,7-octadiene with metallocene/ methylaluminoxane. / Naga, Naofumi; Shiono, Takeshi; Ikeda, Tomiki.
In: Macromolecular Chemistry and Physics, Vol. 200, No. 6, 06.1999, p. 1466-1472.Research output: Contribution to journal › Article
}
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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M3 - Article
VL - 200
SP - 1466
EP - 1472
JO - Macromolecular Chemistry and Physics
JF - Macromolecular Chemistry and Physics
SN - 1022-1352
IS - 6
ER -