thermosets


thermosets,

materials that can not be softened on heating. In thermosetting polymers, the polymer chains are joined (or cross-linked) by intermolecular bonding. Thermosets are usually supplied as partially polymerized or as monomer-polymer mixtures. Cross-linking is achieved during fabrication using chemicals, heat, or radiation; this process is called curing or vulcanization. Important thermosets include phenolics, ureas, melamines, epoxies, polyesters, silicones, rubbers, and polyurethanes.

thermosets

[′thər·mə‚sets] (materials) Polymeric materials that usually have a crosslinked network. They are formed into a permanent shape and are cured (set) by a chemical reaction that may require heat and pressure. Thermoset polymers are typically insoluble, and cannot be remelted or reformed into another shape after curing. Also known as thermosetting resin.