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Reference.org
Styrene
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<p>Styrene is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> C6H5CH=CH2. Its structure consists of a <a href="/facts/Vinyl_group/SyXSgVnw">vinyl group</a> as <a href="/facts/Substituent/6y9IE6G0">substituent</a> on <a href="/facts/Benzene/Fguue7nr">benzene</a>. Styrene is a colorless, oily <a href="/facts/Liquid/t9GkLWzt">liquid</a>, although aged samples can appear yellowish. The compound evaporates easily and has a sweet smell, although high concentrations have a less pleasant odor. Styrene is the precursor to <a href="/facts/Polystyrene/dfIVntty">polystyrene</a> and several copolymers, and is typically made from benzene for this purpose. Approximately 25 million tonnes of styrene were produced in 2010, increasing to around 35 million tonnes by 2018. </p>