| 초록 |
Me2Si(C5Me4)(N-tBu)TiCl2, (nBuCp)2ZrCl2, and Me2Si(C5Me4)(N-tBu)TiCl2/(nBuCp)2ZrCl2 catalyst systems were successfully immobilized on silica and applied for ethylene/hexene copolymerization. Me2Si(C5Me4)(N-tBu)TiCl2 immobilized catalyst afforded poly(ethylene-co-hexene) with high molecular weight and high comonomer content, while (nBuCp)2ZrCl2 immobilized catalyst afforded polymers with low molecular weight polyethylene with low comonomer content. Me2Si(C5Me4)(N-tBu)TiCl2/(nBuCp)2ZrCl2 immobilized hybrid catalyst exhibited high and stable polymerization activity with time, affording polymers with bimodal molecular weight distribution and clear inverse comonomer distribution(low comonomer content for low molecular weight polymer fraction and vice versa). |
