(1) Thermoplastic resin: It has the properties of heat softening and cooling hardening, and does not undergo chemical reactions. No matter how many times heating and cooling are repeated, this property can be maintained. Any thermoplastic resin has a linear molecular structure. It includes both fully polymerized resin and partially condensed resin. Thermoplastic resins include polyethylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, etc. The advantage of thermoplastic resin is that it is easy to process and has high mechanical energy. The disadvantage is poor heat resistance and rigidity. Reference: Rubber Technology Network

(2) Thermosetting resin: After heating, the resin undergoes a chemical change and gradually hardens into shape. It does not soften or dissolve even when heated again. Thermosetting resin has a bulk molecular structure, which includes most of the condensed resins. The advantages of thermosetting resin are high heat resistance and resistance to deformation under pressure. Its disadvantage is poor mechanical performance. Thermosetting resins include phenolic, epoxy, amino, unsaturated polyester, and silicone ether resins.