Polyisobutene

Polyisobutene
	; Sample of polyisobutene with a molecular weight of ~1,000,000
Names
	Other names Polyisobutylene; Poly(isobutene); Poly(isobutylene); PIB
Identifiers
CAS Number	9003-27-4 ;
ChEBI	CHEBI:53725;
ECHA InfoCard	100.108.750
UNII	241BN7J12Y ;
CompTox Dashboard (EPA)	DTXSID2036451 ;
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

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 M_ns of about 500, is used as plasticizers. Medium and high MW polyisobutenes, with M_n ≥ 20,000, are components of commercial adhesives.^[2]

References

^ OPPANOL B 100 by BASF
^ Kenneth S. Whiteley; T. Geoffrey Heggs; Hartmut Koch; Ralph L. Mawer; Wolfgang Immel (2005). "Polyolefins". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a21_487.

[1] OPPANOL B 100 by BASF

[2] Kenneth S. Whiteley; T. Geoffrey Heggs; Hartmut Koch; Ralph L. Mawer; Wolfgang Immel (2005). "Polyolefins". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a21_487.

[1]

[2]

See also

References