Isoprene

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Isoprene

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Chemical name2-Methyl-1,3-butadiene

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Chemical formulaC5H8

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Molecular mass68.11 g/mol

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Density0.681 g/ml

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Melting point-145.95 ?C

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Boiling point34.067 ?C

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CAS number78-79-5

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SMILESCC(=C)C=C

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Isoprene is a common synonym for the chemical compound 2-methyl-1,3-butadiene. It is commonly used in industry, is an important biological material, and can be a harmful environmental pollutant and toxicant when present in excess quantities.

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At room temperature, isoprene is a colorless liquid which is highly flammable and easily ignited. It can form explosive mixtures in air and is highly reactive, capable of polymerizing explosively when heated. The United States Department of Transportation considers isoprene a hazardous material and requires special marking, labeling, and transportation for it.

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It is most readily available industrially as a by-product of the thermal cracking of naphtha or oil. About 95% of isoprene production is used to produce cis-1,4-polyisoprene - a synthetic version of natural rubber.

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Natural rubber is a polymer of isoprene - most often cis-1,4-polyisoprene - with a molecular weight of 100,000 to 1,000,000. Typically, a few percent of other materials, such as proteins, fatty acids, resins and inorganic materials are found in high quality natural rubber.

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Some natural rubber sources are composed of trans-1,4-polyisoprene, a structural isomer which has similar, but not identical properties.

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Cracking: Cracking may refer to:...

Naphtha: Naphtha is a group of various volatile flammable liquid hydrocarbon mixtures used primarily as feedstocks in refineries for the reforming process and in the petrochemical industry for the production of olefins in steam crackers. It is also used in solvent applications in the chemical industry....

Rubber: :This article is about the material rubber, for other uses see Rubber (disambiguation)...