Thermal stabilization of polyoxymethylene by copolymerization and modified phenolic stabilizer: examining the effects of catalyst, retardant, and stabilizer

Study on Ring-Opening Copolymerization of Trioxymethylene and Second Monomer Initiated by Phosphotungstic Acid

“…When the unstable semiacetal is heated, the formaldehyde released continuously, and a new semiacetal terminal group will be generated, which is caused by the active hydrogen of the terminal hydroxyl. The depolymerization progress of POM began from the unstable hydroxyl groups at the chain end and then proceeds sequentially along the backbone chain, resulting in the catastrophic decomposition of the POM chain (Scheme 3) [27,33].…”

“…It would finally lead to the decomposition of POM. In comparison, the boron trifluoride initiating system and the heteropolyacid initiating system [27,28] can initiate polymerization at a smaller dosage. Thereby using this system benefits the posttreatment process.…”

Multi-step polymer degradation kinetics using activation energy-dependent cataluminescence

“…4). 36,37 With increasing time, the intensities of these peaks increased gradually, demonstrating the accumulated quantity of formaldehyde in POM thermal degradation. These IR results validated the degradation products of formaldehyde during the thermal treatment of POM.…”