polyepoxides

Polyepoxides are polymers that contain multiple epoxide groups (oxiranes) in their structure. They are the class of materials known as epoxy resins when used as reactive polymers and as crosslinking networks when cured. The epoxide groups enable rapid crosslinking with curing agents to form rigid, heat-resistant thermosets.

Most commercial polyepoxides are derived from glycidyl ethers or glycidyl esters. A common route is the reaction of epichlorohydrin with a polyphenol such as bisphenol A to produce diglycidyl ether resins, for example the diglycidyl ether of bisphenol A (DGEBA). These monomers can be further polymerized or blended with reactive diluents, curing agents, or fillers to tailor properties. Other monomers include novolac-based glycidyl ethers and aliphatic or cycloaliphatic glycidyls.

Curing (crosslinking) is typically achieved by amine, anhydride, or phenolic hardeners, sometimes with catalysts. The curing converts the liquid resin into a three-dimensional thermoset network with enhanced thermal and chemical resistance. Processing forms include coatings, adhesives, composites, and potting compounds.

Properties of polyepoxides vary with formulation but generally include strong adhesion, good chemical and environmental resistance, high modulus, and a tunable glass transition temperature. They are widely used in protective coatings, structural adhesives, aerospace and automotive composites, electronics encapsulation, and laminated materials.

Safety and handling emphasize that monomers such as epichlorohydrin are hazardous, and uncured resins can cause skin sensitization; proper ventilation, personal protective equipment, and handling procedures are required.