CH2On

CH2On is a shorthand notation used in polymer chemistry to denote a polymer chain made up of repeating units with the chemical formula -CH2-O-, expressed generically as (CH2O)n. It is not a single discrete compound but a way to describe polymers that share this methylene-oxide backbone, most notably polyoxymethylene and related materials.

In practice, CH2On most often refers to polyoxymethylene (POM), also known as polyacetal. The repeating unit -CH2-O- forms a linear backbone, and the subscript n indicates the degree of polymerization. POM can be synthesized from formaldehyde or from trioxane under acidic catalysts; commercial products may be homopolymers or copolymers (POM-C) that incorporate comonomers to improve processing and toughness.

Properties of CH2On-based polymers include high stiffness and dimensional stability, low friction, good wear resistance, and relatively high chemical resistance to neutral and hydrocarbon-based solvents. They exhibit significant crystallinity, contributing to high tensile strength and rigidity, but can be sensitive to hydrolysis at elevated temperatures and to strong acids or bases. Processing is typically done by injection molding or extrusion, and parts are used where precision and durability are important.

Applications for CH2On polymers include gears, bearings, bushings, automotive components, and electrical connectors. Copolymers and blends expand the range of processing temperatures and impact performance. Recycling and environmental considerations vary with the type and form of the polymer, and factory processing often requires careful moisture control to preserve material properties.

See also: polyoxymethylene, polyacetal, trioxane, formaldehyde.