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submitted on 06.05.2020 and posted on 11.05.2020by Yongliang Zhong, quanyou feng, xiaoqian wang, jia chen, wenjun cai, Rong Tong
Ring-opening polymerization is used to prepare
polyesters with precisely controlled molecular weights, molecular weight distributions,
and tacticities. Herein, we report a newly developed Co/Zn catalytic system
that can be activated by an electrical current to mediate efficient
ring-opening polymerization of enantiopure O-carboxyanhydrides,
allowing for the synthesis of isotactic functionalized polyesters with high
molecular weights (>140 kDa) and narrow molecular weight distributions (Mw/Mn < 1.1). We also demonstrate that these catalysts
can be used for stereoselective ring-opening polymerization of racemic O-carboxyanhydrides to synthesize
syndiotactic or stereoblock copolymers with different glass transition
temperatures compared with their atactic counterparts.