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One‐Step Access to Sequence‐Controlled Block Copolymers by Self‐Switchable Organocatalytic Multicomponent Polymerization
Author(s) -
Ji HeYuan,
Wang Bin,
Pan Li,
Li YueSheng
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201810083
Subject(s) - copolymer , polymerization , monomer , polymer chemistry , chemoselectivity , ring opening polymerization , polyester , chemistry , lactide , materials science , catalysis , organic chemistry , polymer
A one‐step procedure for the self‐switchable block copolymerization of monomer mixtures of epoxides, cyclic anhydrides, and lactide (LA) was developed by using simple organocatalysts without an external stimulus. This multicomponent polymerization bridges two catalytic cycles involving ring‐opening alternating copolymerization of epoxides with anhydrides and ring‐opening polymerization (ROP) of LA, in which the presence/absence of anhydrides in mixed feedstocks switched the ROP of LA off/on. The self‐switchable terpolymerization showed distinct noncoordinating and living nature, as well as perfect chemoselectivity. Different combinations of epoxides, anhydrides, and initiators enabled the generation of a variety of new block polyester polyols.