What types of plastics do you have?
According to the molecular structure and thermal properties of synthetic resins in plastics, plastics can be divided into two types, thermoplastics and thermosetting plastics.(1) the characteristics of thermoplastics1) the resin molecules are linear or branched.2) softening when heating, when reaching a certain temperature, melting state, become a flow of viscous fluid, under certain pressure can be shaped into a certain shape, after cooling can maintain the shape has been formed. If heated again, it can be softened, melted and formed again and again.3) in the process of heating and cooling, it is mainly physical change, and in a few cases there are chemical changes.
Plastic refers to the organic synthetic resin as the main ingredient, added or not with other materials (additive) and artificial material. It is usually in the heat and pressure under the condition of plastic devices made with a certain shape. Plastic is a synthetic high molecular organic compounds with plasticity.
At the beginning of the heating, the resin molecules are linear in structure and still have plasticity of thermoplastics. When continue heating, linear molecular chain is formed between the chemical bond (i.e., molecular cross-linking) were net shape structure, when the temperature reaches a certain value, molecules into the body structure, the resin into both melt and dissolve the state. Repeated heating does not soften any longer and is no longer plastic.
