Co2O3 and MnO2 as inexpensive catalysts for the ring-opening polymerization of cyclic esters

Activated Monomer Mechanism (AMM) in Cationic Ring-Opening Polymerization. The Origin of the AMM and Further Development in Polymerization of Cyclic Esters

“…We quote three examples, two related to traditional CROP, namely, BF 3 99 and Al(TfO) 3 , 100 and one more unusual, with metal oxides as catalysts (including Co 2 O 3 , possibly carcinogenic to humans) and claiming synthesis of PCL and PLA with M n over 10 5 g•mol −1 and end groups resulting from initiation with H 2 O. 101…”

“…Nevertheless, several other strong electrophiles were also applied, and apparently, there could be a myriad of such activators, more or less successful. We quote three examples, two related to traditional CROP, namely, BF 3 and Al­(TfO) 3 , and one more unusual, with metal oxides as catalysts (including Co 2 O 3 , possibly carcinogenic to humans) and claiming synthesis of PCL and PLA with M n over 10 5 g·mol –1 and end groups resulting from initiation with H 2 O …”

Recent advances in hydrothermally and solvothermally grown Co3O4 nanostructures for electrochemical energy storage (EES) applications: a brief review

“…29 Co 2 O 3 has been identified as a versatile material with notable properties, including a superparamagnetic nature suitable for applications in microwaves and biomedicine. 30 Additionally, it serves as a catalyst for ring-opening polymerization 31 and demonstrates effectiveness as an active electrode material for supercapacitors. 32 27,35 The cubic normal spinel structured Co 3 O 4 has two oxidation states: Co 2+ and Co 3+ .…”