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Sep 29, 2018

Synthetic resins can be classified into thermoplastic resins and thermosetting resins depending on the changes that occur when heated.

Thermoplastic resin

It has the properties of softening by heat, cooling and hardening, and it does not have a chemical reaction. This performance can be maintained regardless of how many times the heating and cooling are repeated. The molecular structure of a thermoplastic resin is linear. It includes all of the polymeric resin and a partially fused resin. The thermoplastic resin includes polyethylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, and the like. The thermoplastic resin has the advantages of simple processing and high mechanical energy. The disadvantage is poor heat resistance and rigidity.

Thermosetting resin

After the resin is heated, it undergoes a chemical change, is gradually hardened, and is not softened by heat, and cannot be dissolved. The thermosetting resin has a molecular structure which is a bulk type, and includes most of the condensation resin. The thermosetting resin has the advantages of high heat resistance and deformation under pressure. The disadvantage is that the mechanical properties are poor. Thermosetting resins include phenolic, epoxy, amino, unsaturated polyester, and silicone ether resins.

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