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Polyisobuteneamine (PIBA): [-(CH 2-C(CH 3) 2)N(H)-] m In the chemical formulas above, n represents the degree of polymerization of PIB, R represents a hydrogen atom (in the case of ammonia) or an alkyl group (in the case of primary amines), and m is the degree of substitution of the amine group on the polyisobutylene backbone.
The formula for PIB is: –(–CH 2 –C(CH 3) 2 –) n – The formula for IIR is: It can be made from the monomer isobutylene (CH 2 =C(CH 3) 2) only via cationic addition polymerization. A synthetic rubber, or elastomer, butyl rubber is impermeable to air and used in many applications requiring an airtight rubber.
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.
The FBISE was established under the FBISE Act 1975. [2] It is an autonomous body of working under the Ministry of Federal Education and Professional Training. [3] The official website of FBISE was launched on June 7, 2001, and was inaugurated by Mrs. Zobaida Jalal, the Minister for Education [4] The first-ever online result of FBISE was announced on 18 August 2001. [5]
View a machine-translated version of the French article. Machine translation, like DeepL or Google Translate , is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
Píib or pib, a Mayan earth oven Pib and Pog , an animated film Permanent interest bearing shares (PIBS), a fixed-interest securities issued by UK building societies
Description: This book explained Dalton's theory of atoms and its applications to chemistry. Importance: The book was one of the first to describe a modern atomic theory, a theory that lies at the basis of modern chemistry. [3]: 251 It is the first to introduce a table of atomic and molecular weights.
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...