HDDA

HDDA most commonly refers to 1,6-hexanediol diacrylate, a diacrylate monomer widely used in UV-curable systems. The molecule features a hexane-1,6-diyl backbone with two acrylate ester groups, enabling rapid polymerization and crosslinking under ultraviolet irradiation or thermal initiation. It is typically supplied as a viscous liquid and is miscible with many other acrylates and photoinitiators, making it a common reactive diluent in resin formulations.

In coatings, adhesives, inks, and dental composites, HDDA functions as a reactive diluent that reduces formulation viscosity and as a crosslinking agent that contributes to network formation upon curing. By adjusting the proportion of HDDA relative to higher-functionality monomers, formulators can tune properties such as flexibility, hardness, and resistance to solvents. The resulting polymers often exhibit lower shrinkage and improved clarity compared with more rigid systems, though higher crosslink density can raise the glass transition temperature and stiffness.

Synthesis of HDDA is typically achieved by esterification of hexanediol with acrylic acid or by reacting hexanediol with acrylic derivatives such as acryloyl chloride, followed by purification to remove residual water and catalysts. As with many acrylate monomers, handling requires appropriate personal protective equipment and ventilation due to potential irritation or sensitization.

Other uses: The acronym HDDA can denote terms in other fields; this article describes the chemical compound most commonly associated with HDDA in resin chemistry.