Anionic ring-opening polymerization of ethylene oxide in DMF with cyclodextrin derivatives as new initiators
Résumé
Anionic polymerization initiated by cyclodextrins suffers from a poor solubility of those derivatives in standard polymerization solvents. The possibility to perform ethylene oxide polymerization initiated by monofunctional initiators (allyl alcohol, 2-methoxyethanol) by living ring opening polymerization in DMF, a good solvent for any CD derivative, was demonstrated by SEC, 1H and 13C NMR analyses. The study was extended to the use of native CD as initiator, leading to the synthesis of ill-defined structures, explained by the reactivity scale of the various hydroxyl functions. Two selectively modified CD derivatives are then used to synthesize a new family of star-shaped poly(ethylene oxide) polymers with CD core, having 14 or 21 arms. The polymerization was found to be living and DOSY experiments confirmed the well-defined structures for the synthesized star-polymers.
Mots clés
Anionic ring opening polymerization
Cyclodextrin derivatives
Ethylene oxide polymerizations
Hydroxyl functions
Monofunctional initiators
Polymerization solvents
Star polymers
Well-defined structures
Cyclodextrins
Living polymerization
Polyethylene oxides
Polymers
Ring opening polymerization
Anionic polymerization
beta cyclodextrin derivative
macrogol derivative
n
n dimethylformamide
solvent
article
chemistry
conformation
electrospray mass spectrometry
nuclear magnetic resonance spectroscopy
radiation scattering
synthesis
beta-Cyclodextrins
Carbohydrate Conformation
Catalysis
Dimethylformamide
Ethylene Oxide
Kinetics
Light
Magnetic Resonance Spectroscopy
Polyethylene Glycols
Polymerization
Scattering
Radiation
Solvents
Spectrometry
Mass
Electrospray Ionization