Polyisobutene
Sample of polyisobutene with a molecular weight of ~1,000,000[1] | |
Names | |
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Other names Polyisobutylene; Poly(isobutene); Poly(isobutylene); PIB | |
Identifiers | |
CAS Number |
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ChEBI |
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ECHA InfoCard | 100.108.750 |
UNII |
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CompTox Dashboard (EPA) |
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Properties | |
Chemical formula | (C4H8)n |
Molar mass | Variable |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
Chemical compound
Polyisobutene (polyisobutylene) is a class of organic polymers prepared by polymerization of isobutene. The polymers often have the formula Me3C[CH2CMe2]nH (Me = CH3). They are typically colorless gummy solids.
Polymerization is typically initiated with a strong Brønsted or Lewis acid. The molecular weight (MW) of the resulting polymer determines the applications. Low MW polyisobutene, a mixture of oligomers with Mns of about 500, is used as plasticizers. Medium and high MW polyisobutenes, with Mn ≥ 20,000, are components of commercial adhesives.[2]
See also
- Butyl rubber
- Polybutene