Resin usually means a range of softening or melting after being heated, and tends to flow under external force when softened. It is a solid, semi-solid, and sometimes liquid organic polymer at room temperature. Broadly speaking, any polymer that can be used as a raw material for the processing of plastic products is referred to as a resin.
Plastic refers to a material that can be flow-formed during processing by using a resin (or a monomer directly polymerized during processing) as a main component, and an additive such as a plasticizer, a filler, a lubricant, or a coloring agent as an auxiliary component. It can be seen that the resin is one of the raw materials of plastic, and the plastic is the finished product of the resin.
The plastic may be a pure resin or a mixture of various additives, and the resin acts as a binder. The purpose of the added additive is to improve the physical and mechanical properties of the pure resin, to improve the processing properties or to save the resin. Therefore, the most basic physicochemical properties of plastics are determined by the nature of the resin.
The resin can be divided into a natural resin and an artificial resin, which is also called a synthetic resin. Resins are all high polymers, and these polymers have unique molecular internal structures and molecular external structures. The internal structure of the polymer determines the most basic physicochemical properties of the polymer, while the external structure of the polymer determines the processing properties and physical and mechanical properties of the polymer.
The polymer can be classified into an amorphous type (amorphous type), a semi-crystalline type and a crystalline type according to the structural form of the chain after solidification. Therefore, plastics also have an amorphous and crystalline type.
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