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Difference between thermoplastics and thermosetting plastics

Heating becomes soft and flow, cooling hardens, this process is reversible, can be repeated. Polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic, other polyolefin and copolymers thereof, polyirones, polyphenylene ethers, chlorinated polyethers and the like Is a thermoplastic. Thermoplastic resin resin molecular chain are linear or branched structure, the molecular chain between the chemical bond produced, softened when heated flow. The process of cooling and hardening is a physical change.
Thermosetting plastics characteristics
The first heating can soften the flow, heated to a certain temperature, resulting in a cross-linked chemical reaction hardening, this change is irreversible, then, again heating, can no longer become soft flow. With this characteristic, the molding process is carried out, and the cavity is filled under pressure by the plasticizing flow at the time of the first heating, and solidified into an article of definite shape and size. This material is called thermosetting plastics. In this case,
Thermosetting resin before curing resin is linear or branched, after curing the formation of chemical bonds between the molecular chain, a three-degree network structure, not only can not melt touch, can not be dissolved in the solvent. Phenolic aldehydes, melamine formaldehyde, epoxy, unsaturated polyester, silicone and other plastics, are thermosetting plastics. Mainly used for insulation, wear, insulation, high voltage and other harsh environments in the use of plastic, most of the thermosetting plastic, the most commonly 

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