Ring-opening Polymerization: Kinetics, Mechanisms, and Synthesis

1985 American Chemical acid active species addition alkoxide alkyl American Chemical Society amine anhydride anionic polymerization aziridine benzene block copolymers carbamate carbon carboxylate catalyst cationic CH3 CH3 CH3 Chem compounds concentration conversion copolymerization covalent cyclic oligomers diaryliodonium salts diblock disiloxane DMSO double bond electrophilic epoxide Equation ester ether ethylene oxide Figure formation formed free radical glycol graft copolymers halide hydroxyl initiator intermediate ion-pairs ionic kinetic lactone limonene lithium Macromolecules Makromol mechanism merization methyl molecular weight distribution monomer NCA polymerizations nucleophilic observed obtained oligomers opening polymerization orthoesters oxirane oxonium ion peak Penczek polymer polymerization reaction polysiloxane polystyrene present produce propagating species propylene propylene oxide proton rate constant reactivity resonances ring ring-opening polymerization Saegusa Scheme shown siloxane solvation solvent spectra spectrum structure studies styrene styrene oxide synthesis Table temperature terminal tetrahydrofuran tion trans triblock values