Generation of ultra-high-molecular-weight polyethylene from metallocenes immobilized onto N-doped graphene nanoplatelets.
Catalytic natures of organometallic catalysts are modulated by coordinating organic ligands with proper steric and electronic properties to metal centers. Carbon-based nanomaterials such as graphene nanoplatelets are used with and without N-doping and multiwalled carbon nanotube as a ligand for ethylene polymerizations. Zirconocenes or titanocenes are immobilized on such nanomaterials. Polyethylenes (PEs) produced by such hybrids show a great increase in molecular weight relative to those produced by free catalysts. Specially, ultra-high-molecular-weight PEs are produced from the polymerizations at low temperature using the hybrid with N-doped graphene nanoplatelets. This result shows that such nanomaterials act a crucial role to tune the catalytic natures of metallocenes.
Department of Chemistry, KAIST, Yuseong, Daejeon 305-751, Korea.
Baekhap
B
Choi
Juno
J
Lee
Seungjun
S
Lee
Jae-Hyeon
JH
Ko
Kyoung-Seok
KS
Lee
Junghoon
J
Oh
Jongwoo
J
Han
Yong-Hyun
YH
Kim
Insung S
IS
Choi
Sungjin
S
Park
D002384:Catalysis; D006108:Graphite / Q000737:chemistry*; D015394:Molecular Structure; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D011095:Polyethylenes / Q000138:chemical synthesis*; D015040:Zirconium / Q000737:chemistry*
D037742:Nanotubes, Carbon; D009942:Organometallic Compounds; D011095:Polyethylenes; C013108:metallocene; C111601:ultra-high molecular weight polyethylene; C406884:titanocene; C023398:Zirconocene dichloride; D006108:Graphite; D015040:Zirconium