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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.
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]
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.
This article is about the gross regional product (GRP) per capita of French regions and overseas departments in nominal values. [1] Values are shown in EUR€. For easy comparison, all the GRP figures are converted into US$ according to annual average exchange rates. [2] [n 1] All values are rounded to the nearest hundred.
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
Aside from being one of the first chemistry textbooks, the book was one of the first to state the Law of conservation of mass, define a chemical element, and contain a list of known elements. [10] [3]: 154 [11]: 410
The Société Chimique de France (SCF) is a learned society and professional association founded in 1857 to represent the interests of French chemists in a variety of ways in local, national and international contexts. [1] Until 2009 the organization was known as the Société Française de Chimie.
In 2011, France (whose territory in the national accounts refers to Metropolitan France plus the four old overseas regions of Guadeloupe, Martinique, French Guiana, and Réunion, but excludes Mayotte and the six overseas collectivities) had a GDP of US$2,778 bn, 98.2% of which was produced in Metropolitan France, and 1.8% in the four overseas ...