Graft Copolymers with Complex Polyether Structures: Poly(ethylene oxide)- graft - Poly(isobutyl vinyl ether) by Combination of Living Anionic and Photoinduced Cationic Graft Polymerization

摘要

A novel polymerization mechanism transformation strategy, involving anionic ring-opening polymerization and photoinduced cationic polymerization, is successfully applied for the synthesis of poly(ethylene oxide)- graft -poly(isobutyl vinyl ether) (PEO- g -PIBVE). First, poly(ethylene oxide- co -ethoxyl vinyl glycidyl ether) [P(EO- co -EVGE)] is synthesized by living anionic polymerization. The vinyl moieties of the functional PEO-based polymer are converted to the hydrogen iodide adduct by photolysis of diphenyliodonium iodide, monitored using NMR spectroscopy. A modified mode of Lewis acidcatalyzed living cationic polymerization is performed as a “grafting from” method to generate PIBVE segments grafted onto the PEO main chain. Both the intermediates and the final graft copolymers are characterized by gel-permeation chromato graphy (GPC) and ~1H NMR analysis.