The synthesis and polymerization behavior of bimetallic pyridine diamide complexes containing transition metal (Ti, Zr)
✍ Scribed by Kap Ku Kang; Seung-Pyo Hong; Young-Tae Jeong; Takeshi Shiono; Tomiki Ikeda
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 176 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
Titanium and zirconium complexes with a pyridine diamide ligand, [2,6-(RNCH 2 ) 2 NC 5 H 3 ] 2Ϫ (PDMP; R ϭ 2,6-dimethylphenyl) have been synthesized and their catalytic behaviors investigated for ethylene polymerization. It was found that the zirconium complexes, [PDMP]ZrCl 2 (7) and [PDMP][ZrCl 3 ϫ THF] 2 (8), gave higher activities than the titanium complexes, [PDMP]TiCl 2 (5) and [PDMP][TiCl 3 ] 2 (6). The bimetallic complexes (6, 8) gave higher activities than the corresponding monometallic complexes (5, 7). The titanium complexes gave polymers with higher molecular weight (M w ) than the zirconium complexes. The molecular weight distribution (M w /M n ) of the polymers obtained from the pyridine diamide complexes were much broader than that of the normal metallocene catalysts.