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[Chemical Knowledge]：Polystyrene and polyester: the difference between two common polymers

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Polystyrene and polyester are two common plastic materials, which are widely used in daily life and industrial production. Although they are all polymer materials, there are great differences in chemical structure, performance characteristics and uses.

from the chemical structure point of view, polystyrene is a polymer compound formed by the polymerization of styrene monomer, and polyester is a polymer compound formed by the esterification reaction of dibasic acid and diol. This determines their performance differences.

from the physical properties, polystyrene is usually colorless or yellowish transparent solid, with good electrical insulation and mechanical strength, but poor heat resistance. The polyester is usually colorless or light yellow solid, has good heat resistance and solvent resistance, but the mechanical strength is relatively low. Therefore, in practical applications, it is necessary to select suitable materials according to specific requirements.

In addition, from the point of view of processing technology, polystyrene is easy to form, and can be processed by blow molding, extrusion molding, injection molding and other methods, and is widely used in packaging, furniture, building materials and other fields. Polyester can be processed by hot pressing, injection molding, extrusion and other methods, and is widely used in textiles, electronics, automobiles and other fields.

In general, although polystyrene and polyester are common polymer materials, they are quite different in chemical structure, physical properties and processing technology. In practical applications, it is necessary to select suitable materials according to specific needs to play its greatest role.

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