cyclohexanedimethanol

Cyclohexanedimethanol, commonly abbreviated CHDM, is an organic diol used as a co-monomer in polyesters and polyurethanes. It corresponds to cyclohexane-1,4-dimethanol, with the chemical formula C8H16O2. The molecule features a cyclohexane ring bearing two primary hydroxymethyl groups at the 1 and 4 positions, giving two terminal -CH2OH groups and high functionality for polymerization.

In terms of physical properties, CHDM is typically a colorless, viscous liquid at room temperature with a relatively high boiling point and low vapor pressure. It is soluble in many organic solvents and has limited water solubility due to the bulky hydrophobic ring, though the two hydroxyl groups impart some affinity for water.

Industrial production of CHDM is achieved through commercial routes that generally involve hydroxymethylation and hydrogenation of cyclohexanone or related cyclohexane derivatives. The aim is to install the two hydroxymethyl groups and obtain a high-purity diol suitable for polymer synthesis.

Applications of CHDM center on its role as a diol co-monomer in polyesters and polyurethanes. In polyester resins, CHDM can improve thermal stability, chemical resistance, and stain/clarity properties, contributing to PET-type and PETG-type materials. In polyurethanes, it serves as a reactive polyol component, helping to tune hardness, stiffness, and hydrolytic performance. CHDM is also used in UV-curable coatings and specialty polymers where a cycloaliphatic diol structure is advantageous.

Safety considerations for CHDM include potential irritation to skin and eyes on contact, and respiratory irritation if inhaled as a mist or dust. Proper handling with protective gear, adequate ventilation, and storage away from incompatible substances are advised.