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The Content Analysis of Hydrazide-Based Formaldehyde Reducing Agent for POM Using 1H NMR Spectroscopy

Polyoxymethylene (POM) is a polymer composed of formaldehyde as a monomer and has excellent physical properties. However, it has low thermal stability and is easily decomposed, thereby generating formaldehyde. In order to reduce the emission of formaldehyde from POM, nitrogen compounds are used as a reducing agent. In this study, a simple method of analyzing the content of hydrazide compounds, a formaldehyde reducing agent, added to a low odor POM copolymer was developed using 1 H NMR spectroscopy. An excess amount of formaldehyde was added to the analytical sample to convert the entire hydrazide group to a hydrazone which is easy to analyze in H NMR spectrum. It was confirmed that the quantitative analysis of hydrazide additive was possible with accuracy of 95% level.