Styrene

Styrene, also known as ethenylbenzene or vinylbenzene (CAS: 100-42-5), is a foundational organic compound in the global petrochemical industry. It is a colorless, oily liquid characterized by a distinct, sweet aromatic odor at low concentrations, though it becomes pungent at higher levels. Historically produced via the catalytic dehydrogenation of ethylbenzene, styrene serves as the essential monomer for a vast array of homopolymers and copolymers. Its chemical structure features a benzene ring attached to a vinyl group, making it highly reactive and prone to spontaneous polymerization. To ensure safe transport and storage, it is typically treated with polymerization inhibitors such as 4-tert-butylcatechol (TBC). While styrene is indispensable for modern materials science—bridging the gap between crude oil derivatives and consumer plastics—it requires rigorous industrial hygiene. It is classified as a flammable liquid and is recognized by the IARC as a Group 1 carcinogen, necessitating stringent regulatory compliance and environmental monitoring.