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Polyisobutene (polyisobutylene) is a class of organic polymers prepared by polymerization of isobutene. The polymers often have the formula Me 3 C[CH 2 CMe 2] n H (Me = CH 3). They are typically colorless gummy solids. Cationic polymerization, initiated with a strong Brønsted or Lewis acid, is the typical method for its production.
Polyisobutylene, also known as "PIB" or polyisobutene, (C 4 H 8) n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based. Butyl rubber is produced by polymerization of about 98% of isobutylene with about 2% of isoprene.
The history of polyisobuteneamine dates back to the early development and study of polyisobutylene. The first synthesis of polyisobutylene was reported in 1931 by the German chemists Hermann Staudinger and Leonidas Zechmeister, who obtained the polymer through the cationic polymerization of isobutylene. [1]
Polybutene is an organic polymer made from a mixture of 1-butene, 2-butene, and isobutylene.Ethylene steam cracker C4s are also used as supplemental feed for polybutene. It is similar to polyisobutylene (PIB), which is produced from essentially pure isobutylene made in a C4 complex of a major refinery.
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Isotactic PB-1 is produced commercially using two types of heterogeneous Ziegler–Natta catalysts. [3] The first type of catalyst contains two components, a solid pre-catalyst, the δ-crystalline form of TiCl 3, and solution of an organoaluminum cocatalyst, such as Al(C 2 H 5) 3.
The sixteenth FDA-approved antiretroviral. It was the first protease inhibitor approved for twice-a-day dosing instead of needing to be taken every eight hours. The convenient dosing came at a price, as the dose required is 1,200 mg, delivered in 8 very large gel capsules.
Four isomers of Polyisoprene. In principle, the polymerization of isoprene can result in four different isomers.The relative amount of each isomer in the polymer is dependent on the mechanism of the polymerization reaction.