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- Title
稀土配合物催化的乙烯、环烯烃和1-辛烯三元共聚.
- Authors
王琳枫; 田 慧; 龚光碧; 吴春姬; 王保力; 崔冬梅
- Abstract
Cyclic olefin copolymer (COC) is produced through the copolymerization of ethylene and cyclic olefins, and has been used for the manufacturing of optical devices and diagnostic containers due to its high transparency and excellent water vapor barrier. However, COC with high glass-transition temperature usually needs high cycloolefin insertion in copolymer and has increased brittleness, which has significantly hampered its many end uses. The introduction of α -olefin into ethylene/cycloolefin binary copolymers that have been extensively studied is expected to expand the application of cyclic olefin copolymers. In this paper, we report the terpolymerization of ethylene/norbornene/1-octene and ethylene/dicyclopentadiene/1-octene catalyzed by modified cyclopentadienyl scandium complexes 1−3 activated with [Ph3C] [B (C6F5 ) 4 ] and Ali Bu3 because rare earth catalysts have shown excellent catalytic performance towards olefin polymerization. These rare earth catalysts exhibit high catalytic activities (4. 4×105 ~21. 4×105 g/ (mol (Sc) ·h·bar) ) . The resultant terpolymers show moderate number average molecular weight (Mn=3. 8×104 ~20. 3×104 ) and relatively narrow polydispersity index (PDI=1. 2~2. 4) . The introduction of 1-octene significantly improves the toughness of ethylene/norbornene/1-octene terpolymers, and the P3 sample (Mn 13. 7×104, norbornene 37. 1%, 1-octene 11. 0%) exhibits 2. 0 times higher elongation at break (29. 9% vs. 9. 9%) than the P1 sample (Mn 14. 0×104, NB 42. 6%, OCT 6. 4%)
- Publication
Chinese Journal of Applied Chemistry, 2023, Vol 40, Issue 10, p1396
- ISSN
1000-0518
- Publication type
Article
- DOI
10.19894/j.issn.1000-0518.230100