posted on 2022-01-07, 22:05authored byChenyang Hu, Xing Chen, Mingxin Niu, Qi Zhang, Ranlong Duan, Xuan Pang
Immortal polymerization is a unique
strategy for ring-opening copolymerizations
(ROCOP) with epoxide monomers. In conjunction with various chain transfer
agents (CTAs), the first immortal ROCOP of a typical epoxide (propylene
oxide, PO) and isocyanate (p-tosyl isocyanate, TSI)
using a commercial manganese catalyst is reported. In addition to
precise molecular-weight control, this approach afforded novel polyurethane
(PU) with unprecedented functionality, topology, and pinpoint sequence
with secondary carbamyl linkage. In addition, a block copolymer of
poly(lactic acid) (PLA) with PU was synthesized via a sequential addition
strategy, which offered an attractive access to expanding the scope
of copolymers derived from aliphatic polyesters.