Polyethylene glycol diamine

Polyethylene glycol diamine (CAS 24991-53-5), commonly abbreviated as PEG diamine, is a difunctional amine-terminated polyether used to introduce flexible, hydrophilic segments into polymer networks. Its terminal amine groups enable direct reaction with epoxies, isocyanates, and anhydrides, making it a practical building block for controlled crosslinking and chain extension in various systems.

In epoxy coating and adhesive systems, this material acts as a flexible curing agent, reducing brittleness in cured films while maintaining adhesion to demanding substrates during the curing process. Polyurethane and polyurea formulators incorporate it as a soft-segment extender to tune elasticity and moisture response in sealants and elastomeric components for industrial and commercial use.

Surface modification of textiles and technical fibers relies on its amine reactivity to graft hydrophilic functionality, improving wettability and dye uptake across different fiber types. In industrial cleaning and home care formulations, it contributes to rheology adjustment and surface-active behavior in polymer-based systems, enhancing the performance of the final product.

The product is supplied as a clear to slightly yellow liquid across a range of molecular weights, typically from 400 to 4000 g/mol, with MW directly influencing flexibility and density. Technical grade is the standard commercial offering, with purity and amine value specified per lot. Bulk and drum quantities are the typical supply formats for industrial procurement needs.