| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 합성 |
| 제목 | Polymerization of Ethylene and Copolymerization Ethylene and 1-Hexene using (n-BuCp)2ZrCl2 Catalyst Activated with the Cross-linked MAO Supported Cocatalyst |
| 초록 | A new type of the cross-linked methylaluminoxane (MAO) supported cocatalyst was prepared by the reaction of a soluble MAO and the cross-liking agent such as an aromatic diamine compound. The cross-linked MAO supported cocatalyst was used for the polymerization of ethylene and copolymerization of ethylene and 1-hexene in the presence of bis(n-butylcyclopentadienyl) zirconium dichloride, (n-BuCp)2ZrCl2. The catalyst activity of (n-BuCp)2ZrCl2 cocatalyzed with the new supported cocatalyst was higher than that of the commercial silica-supported MAO (SMAO) cocatalyst. The molecular weight and the bulk density of polyethylene produced by using a new supported cocatalyst were slightly higher than those of polyethylene by commercial SMAO. The resulting polyethylene particles show a spherical morphology with very few fine particles. The influence of 1-hexene concentrations in the feed on catalyst activity and other properties was investigated. This new catalyst system shows higher catalyst activity and reactivity of 1-hexene than the corresponding commercial catalyst system. (n-BuCp)2ZrCl2 cocatalyzed with the new supported cocatalyst produce random copolymers with narrow molecular weight distribution and short chain branching distribution. The microstructure of the resulting poly(ethylene-co1-hexene) characterized by 13C-NMR and temperature rising elution fractionation. Fig. 1. Morphology control of the polyethylene particle for the cross-linked MAO supported cocatalysts. Fig. 2. Temperature rising elution fractionation (TREF) profiles of the copolymers prooduced with the different catalyst systems. References 1. D.H. Lee, H.B. Lee, S.K. Noh, J.H. Kim, K.B. Yoon, H.J. Kim and S.S. Woo, Korea Polym. J., 5, 234 (1997) 2. J.H.K. Santos, T. Uozumi, T. Teranishi, T. Sano and K. Soga, Polymer, 42, 4517 (2001). 3. k.B. Yoon, Macromol. Res., 12, 336 (2004) |
| 저자 | 윤근병1, 최진식1, 이동호1, 노석균2 |
| 소속 | 1경북대, 2영남대 |
| 키워드 | Cross-linked MAO supported cocatalyst; metallocene; copolymerization; TREF |
