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How is polystyrene made from styrene?
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major industrial polymers
Figure 1: The linear form of polyethylene, known as high-density polyethylene (HDPE).
Polystyrene is produced through the polymerization of styrene, a vinyl monomer with the chemical structure .12
The process relies on the carbon-carbon double bond within the styrene molecule. Under the influence of chemical initiators, this double bond opens, allowing the molecule to link with other styrene units to form a long carbon backbone. The presence of large, ring-shaped phenyl groups hanging from this backbone prevents the chains from packing closely, which gives the resulting polymer its characteristic transparency and rigidity.21
Industrially, this is primarily achieved through:
- Free-radical polymerization: The most common method, utilizing free-radical initiators in bulk, suspension, solution, or emulsion processes.1
- Ionic polymerization: Less common in industry, this method uses cationic or anionic initiators to trigger the reaction. Under specific conditions, this can create "living polymers" that retain active chain ends, allowing for the production of block copolymers.3