Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 34, Issue 6, Pages 533-538Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201200768
Keywords
catalysis; doping; graphenes; metallocene catalysts; polyethylene
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Funding
- Inha University
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Education, Science and Technology, Korea [2011-0031629]
- WCU program through the NRF of Korea [R31-2008-000-10071-0]
- Basic Science Research program through the NRF of Korea [2010-0006922]
- NRF through the Korea-India Collaboration Program
- National Research Foundation of Korea [2010-0006922] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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