From experimental data, a conclusion is drawn on chain character of cyclo-olefin ring-opening polymerization. It was suggested that the active centres of this process are carbene complexes of transition metals (W, Mo, Re). The confirmation of this view comes from studies on the initiation of ring-op
New aspects of the mechanism of the ring-opening polymerization of cyclo-olefins
β Scribed by E. Ceausescu; A. Cornilescu; E. Nicolescu; M. Popescu; S. Coca; C. Belloiu; M. Dimonie; M. Gherorghui; V. Dragutan; M. Chipara
- Publisher
- Elsevier Science
- Year
- 1985
- Weight
- 782 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0304-5102
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π SIMILAR VOLUMES
Abstraet--Cyclo-olefins may be polymerized under very mild conditions to give linear polymers using a mixture of WCI6 and A1Br3. No metal alkyls are involved. The polymers contain no vinylic unsaturation. \* Commercial product, 60 per cent trans, 30 per cent cis, I0 per cent saturated material. t T
To obtain more insight in the ring-opening polymerization of lactones, complex formation of the initiators tetraphenyltin, stannous octoate, tin tetrachloride, aluminium bromide and triisobutylaluminium (TIBA), and the monomers L(-)-lactide, D,e-lactide and glycolide was studied by i.r.-spectroscopy
This paper describes some stereochemical aspects of the cationic ring-opening polymerization of bicyclic acetals and lactones, particularly those having a 6,8-dioxabicyclo[3.2.1]octane skeleton. part. polymerization of bicyclic acetals is discussed, with particular emphasis on cleavages of acetal bo
## Abstract The anionic ringβopening polymerization of a model monomer of cyclodisilazanes 1, initiated with both organosodium and organolithium initiators, was investigated. Under specific conditions, this polymerization exhibits all the characteristics of a living process. Indeed, whatever the ex