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

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...

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Bibliographic Details
Published in:Polymer chemistry 2020-06, Vol.11 (22), p.3756-3761
Main Authors: Ryu, Ho Kyun, Bae, Dae Young, Lim, Hyeongi, Lee, Eunsung, Son, Kyung-sun
Format: Article
Language:English
Subjects:
Chromium
Copolymerization
Cyclohexene
Glass transition temperature
Ligands
Maleic anhydride
NMR
Nuclear magnetic resonance
Phthalic anhydride
Polyester resins
Polymer chemistry
Ring opening polymerization
Selectivity
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Summary: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 ( T g 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 . This work describes polyester synthesis via alternating ring-opening copolymerization of epoxides and anhydrides using a trigonal bipyramidal chromium complex containing a sterically demanding ligand.
ISSN:1759-9954
1759-9962
DOI:10.1039/d0py00155d