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.

Related Topics:
Cracking - Naphtha - 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.

Related Topics:
Rubber - Polymer

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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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