According to the molecular structure and characteristics of synthetic resin, it can be divided into thermoplastic and thermosetting plastics
Thermoplastic: the molecular structure of synthetic resin in this kind of plastics is linear or branched chain structure.
Thermosetting plastics: the molecular structure of the resin in this kind of plastics is finally the body structure. It has a linear structure at the beginning of heating. Therefore, it has plasticity and solubility, and can be made into plastic parts of a certain shape. When heating is continued, the main chains of linear molecules form a chemical bond (i.e. cross-linking), and the molecules become a network structure. When the temperature reaches a certain value, the cross-linking reaction further develops, and the molecules finally become a body structure. The resin is neither dissolved nor melted, and the shape of the plastic part will not change after being fixed.
