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Ring-opening copolymerization of cyclic epoxide and anhydride using a five-coordinate chromium complex with a sterically demanding amino triphenolate ligand

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Abstract

An alternating ring-opening copolymerization (ROCOP) of epoxides (cyclohexene oxide, limonene oxide) and anhydrides (phthalic anhydride, naphthalic anhydride and maleic anhydride) was performed using a chromium complex containing a sterically demanding amino triphenolate ligand in the presence of a cocatalyst (bis(triphenylphosphine)iminium chloride (PPNCl) or 4-dimethylaminopyridine (DMAP)). The polymerization reaction was strongly affected by the types and feed ratio of monomers and cocatalysts. After optimizing the reaction conditions, the chromium complex successfully produced perfectly alternating polyesters with high selectivity (>99% ester linkages), high molecular weights (up to 43.8 kDa), high glass transition temperatures (Tg up to 159 °C), and low dispersities. In addition, a small amount of the catalyst yielded a turnover frequency (TOF) as high as 380 h−1.

Graphical abstract: Ring-opening copolymerization of cyclic epoxide and anhydride using a five-coordinate chromium complex with a sterically demanding amino triphenolate ligand

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Supplementary files

Article information


Submitted
30 Jan 2020
Accepted
06 May 2020
First published
08 May 2020

Polym. Chem., 2020, Advance Article
Article type
Paper

Ring-opening copolymerization of cyclic epoxide and anhydride using a five-coordinate chromium complex with a sterically demanding amino triphenolate ligand

H. K. Ryu, D. Y. Bae, H. Lim, E. Lee and K. Son, Polym. Chem., 2020, Advance Article , DOI: 10.1039/D0PY00155D

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