| 초록 |
Metallocene and single-site catalysts have proved to be suitable catalysts for the polymerization of ethylene, propylene and higher α-olefins. In this study, the preparations of ultra high molecular weight polyethylenes using immobilized zirconium and titanium complexes with bis(phenoxy-imine) ligands were investigated and the results were compared with those using metallocene and other single-site catalysts. Effects of polymerization parameters such as monomer pressure, solvents, temperature, aluminium alkyls, and cocatalysts on the behavior of polymerizations were also studied. Acknowledgements: This work was supported by Ministry of knowledge economy(MKE) grant funded by the Korea government (MKE, No. 10028384-2007-12). |
