Polyoxymethylene (POM), known as "steel" or "steel", is an important thermoplastic crystalline polymer. Its chemical composition is mainly based on formaldehyde and is obtained through a specific polymerization process.
The chemical composition of POM is closely related to its two main types, namely homopolyoxymethylene (POM-H) and copolymer polyoxymethylene (POM-C). Homopolyoxymethylene is directly polymerized by formaldehyde, and the molecular chain contains only oxymethylene repeating structural units, with high density and crystallinity. This structure gives homopolyoxymethylene excellent mechanical properties and rigidity. Copolyoxymethylene is obtained by ring-opening polymerization of trioxymethylene and a small amount of dioxopentacyclic rings. In addition to oxymethylene groups, the molecular chain also contains dioxopentacyclic ring groups. This structure makes copolymer polyoxymethylene perform better in thermal and chemical stability, and has better processing performance.
Whether it is homopolyoxymethylene or copolymer polyoxymethylene, they all show some common characteristics. POM is a linear polymer with no side chains, high density and high crystallinity, which makes it have excellent wear resistance, self-lubrication and fatigue resistance. In addition, POM also has good electrical insulation and chemical corrosion resistance, and can maintain stable performance in a variety of environments.
It is worth noting that POM needs to pay attention to its thermal stability during processing. Since it is easy to decompose at high temperatures, the temperature and time need to be strictly controlled during processing. In addition, POM is also sensitive to ultraviolet radiation, and long-term exposure may lead to performance degradation.
In general, POM has broad application prospects in electronics, machinery, automobiles and other fields due to its unique chemical composition and excellent comprehensive performance.