| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.63 |
| 발표분야 | 고분자 합성 |
| 제목 | Ni(II) a- Diimine Complexes for Ethylene Polymerization: The Influence of Remote Substituents and Cocatalysts. |
| 초록 | The Ni(II) diimine catalysts exhibit high activities which are comparable to those of metallocene catalysts. But the sensitivity of metallocenes to polar substituents is largly responsible for an increase in interest in the late-transition metal complexes as olefin polymerization catalysts. With the same interest, we have developed a series of Ni(II) complexes bearing bulky diimine ligands, which serve as good catalysts for the polymerization of ethylene. Polymerization with these catalysts has been explored under a variety of reaction condition. The activity of the dihalide complexes with different cocatalysts has been thoroughly investigated; out of which ethyl aluminum sesquichloride showed remarkable activity even at very low concentrations in normal conditions. High activity was maintained over a wide range of cocatalyst ratio also .The effects of newly synthesized diamines on the catalytic structure were studied extensively. The influence of remote substituents on catalytic activity was proved by cyclic voltammetry The polymerization with bulky substituted a-diimine ligands yields a high molecular weight polyethylene, with broad MWD which vary with the microstructure of the catalyst.. Also activity decreases with increase in temperature. The polyethylene has been characterized by NMR, GPC and DSC. Fig:1 Catalyst under investigation Fig:2 Activity curve showing |
| 저자 | 비잘, 하창식, 김일 |
| 소속 | 부산대 |
| 키워드 | Ethylene polymerisation; Ni(II) catalyst |
