Journal
POLYMER CHEMISTRY
Volume 4, Issue 13, Pages 3774-3790Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3py00319a
Keywords
-
Categories
Funding
- 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
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available