Halogen-Bonding-Mediated and Controlled Cationic Polymerization of Isobutyl Vinyl Ether: Expanding the Catalytic Scope of 2-Iodoimidazolium Salts.
Chemistry
; 23(40): 9495-9500, 2017 Jul 18.
Article
em En
| MEDLINE
| ID: mdl-28557283
ABSTRACT
Metal-free initiating systems for living cationic polymerizations are desirable from the viewpoint of environmentally benign polymer synthesis. We describe here the development of a halogen-bonding-mediated and controlled cationic polymerization of isobutyl vinyl ether (IBVE) using 2-iodoimidazolium salts as an organocatalyst. Due to the ionic nature of the catalysts, the polymerization should be performed in CH2 Cl2 . The HCl-adduct of IBVE was the most suitable initiator, and the polymerization was carried out at -10 °C under the catalyst concentration of 10â
mm to suppress alcohol elimination from the polymer chain. The addition of a small amount of nBu4 NCl (0.02â
equivalent) was effective to accomplish the controlled cationic polymerization and obtain polyIBVE, having the molecular weight distribution below 1.3.
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MEDLINE
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En
Ano de publicação:
2017
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Article