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Updated: Sep 13, 2025

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
Published on: November 21, 2017
Dispersity-controlled ring-opening polymerization of epoxide
Yubo Zhou1, Junpeng Zhao2,3, Guangzhao Zhang1
1Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, PR China.
None:
Dispersity or molar mass distribution (ÐM) profoundly influences polymer properties, but its control remains a challenge, especially for ring-opening polymerization (ROP). We report here a simple approach to tailor ÐM of aliphatic polyethers, e.g., poly(ethylene oxide) and poly(propylene oxide), by introducing an editable chain-transfer reaction in organocatalyzed ROP of epoxides. Trifluoroacetate, acting as the chain-transfer agent (CTA), brings about non-uniform growth of polyether chains while ensuring complete initiation efficiency and readily removable CTA residue. Triple control over ÐM (1.05-2.00), molar mass (3.6-17.7 kg mol-1), and end group is achieved simply by regulating the feed ratio, conforming well with the theoretical modeling. Experimental and calculation results reveal the orthogonality between chain growth and transesterification which is key to the three-modular ROP for independent ÐM control.
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