Polyisobutene

Polyisobutene
Sample of polyisobutene with a molecular weight of ~1,000,000
Names
Other names
Polyisobutylene; Poly(isobutene); Poly(isobutylene); PIB
Identifiers
ChEBI
ECHA InfoCard 100.108.750
UNII
Properties
(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

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.

Cationic polymerization, initiated with a strong Brønsted or Lewis acid, is the typical method for its production. 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.

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