title: Chemoselective Polymerizations from Mixtures of Epoxide, Lactone, Anhydride, and Carbon Dioxide.
abstract: Controlling polymer composition starting from mixtures of monomers is an important, but rarely achieved, target. Here a single switchable catalyst for both ring-opening polymerization (ROP) of lactones and ring-opening copolymerization (ROCOP) of epoxides, anhydrides, and CO2 is investigated, using both experimental and theoretical methods. Different combinations of four model monomers-ε-caprolactone, cyclohexene oxide, phthalic anhydride, and carbon dioxide-are investigated using a single dizinc catalyst. The catalyst switches between the distinct polymerization cycles and shows high monomer selectivity, resulting in block sequence control and predictable compositions (esters and carbonates) in the polymer chain. The understanding gained of the orthogonal reactivity of monomers, specifically controlled by the nature of the metal-chain end group, opens the way to engineer polymer block sequences.
authors.affiliation: Department of Chemistry, Imperial College London , London SW7 2AZ, U.K.
authors.forename: Charles
authors.initials: C
authors.lastname: Romain
authors.affiliation: Department of Chemistry, Imperial College London , London SW7 2AZ, U.K.
authors.forename: Yunqing
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Department of Chemistry, Imperial College London , London SW7 2AZ, U.K.
authors.forename: Paul
authors.initials: P
authors.lastname: Dingwall
authors.affiliation: Department of Chemistry, Imperial College London , London SW7 2AZ, U.K.
authors.forename: Shyeni
authors.initials: S
authors.lastname: Paul
authors.affiliation: Department of Chemistry, Imperial College London , London SW7 2AZ, U.K.
authors.forename: Henry S
authors.initials: HS
authors.lastname: Rzepa
authors.affiliation: Department of Chemistry, University of Bath , Bath BA2 7AY, U.K.
authors.forename: Antoine
authors.initials: A
authors.lastname: Buchard
authors.affiliation: Department of Chemistry, Imperial College London , London SW7 2AZ, U.K.
authors.forename: Charlotte K
authors.initials: CK
authors.lastname: Williams