Explanation

It is synthesized by free radical polymerization of styrene monomer. According to the arrangement of styrene groups on the macromolecular chain, it can be divided into different types, such as random polystyrene (aPS), isotactic polystyrene (i-PS) and syndiotactic polystyrene (s-PS), of which random polystyrene is the most widely used. polystyrene is an amorphous polymer with high transparency because the side chain of the styryl group on the molecular chain of polystyrene is a special structure. The arrangement of the side chains of polystyrene results in high rigidity of the molecular chain of polystyrene, making it a transparent, colorless and tasteless rigid solid, and the transmittance can be as high as 88% to 90%. This makes the product hard and produces a crisp sound when struck. polystyrene is an amorphous polymer, so there is no obvious melting point. It has flow ability in a wide temperature range. The temperature range from melting to decomposition is wide, usually between 120 ° C and 180 ° C. Therefore, molding processing can be carried out in this range. polystyrene can be processed by many methods, including injection molding, extrusion, foaming, blow molding, thermo-forming, etc. In addition, polystyrene is often used to make foamed plastics products, such as foam cups, foam trays, etc. It can also be copolymerized with other monomer to produce products with different properties. In daily life, polystyrene is widely used to manufacture disposable plastic cups, transparent CD boxes, etc. In addition, it is also used to manufacture various medical supplies, bottles, packaging materials, etc.

Classification