期刊
POLYMER CHEMISTRY
卷 4, 期 13, 页码 3774-3790出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3py00319a
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资金
- German Research Foundation (DFG) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [201040100660]
- Korea government Ministry of Knowledge Economy, and Ministry of Science, Research and Technology of Iran
The effect of polymerization parameters, such as pressure (ethylene concentration), temperature and comonomer type and concentration, on several long-chain branched (LCB) ethylene homopolymers and ethylene/alpha-olefin copolymers was investigated with respect to their degree of long-chain branching. Common long-chain branched metallocene polyethylenes (LCB-mPEs) and comb-like LCB-PEs, which have high viscosity and significantly differ from conventional LCB-mPEs, have been used to evaluate different proposed mechanisms for LCB-formation based on available characterization methods. The correlations between polymerization parameters and degree of long-chain branching were compared with the correlations predicted by different formation mechanisms (intermolecular auto-copolymerization by re-incorporation of b-hydride terminated chains, intramolecular insertion of stored vinyl terminated chains, chain walking and s-bond metathesis reactions) to elucidate which of these mechanisms is the correct one. The intermolecular auto-copolymerization mechanism was found to be the predominant mechanism behind LCB-formation in slurry phase polymerization. However, s-bond metathesis reactions cannot be entirely ignored.
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