WebThe present invention relates to novel polytetrahydrofuran ethers of general formula R.sup.1 --O--(CH.sub.2).sub.4 ].sub.n O--R.sup.2 I where n is a number from 3 to 70, and R.sup.1 and R.sup.2 are aliphatic hydrocarbon radicals containing 3 to 5 carbon atoms and a double bond, but where R.sup.2 may alternatively be hydrogen. Polytetrahydrofuran, also called poly(tetramethylene ether) glycol or poly(tetramethylene oxide), is a chemical compound with formula (C 4H 8O)nOH2 or HO-(-(CH2)4O-)n-H. It can be viewed as a polymer of tetrahydrofuran, or as the polyether derived from 1,4-butanediol. The product is … See more The main use of polytetrahydrofuran is to make elastic fibres such as spandex (elastane) for stretchable fabrics and for polyurethane resins. The latter are polyurethane prepolymers dissolved in solvent. They are … See more Polytetrahydrofuran is commonly prepared by acid-catalyzed polymerization of tetrahydrofuran. The starting material is natural gas, which is converted to acetylene, then reacted with formaldehyde to make butynediol and then butanediol. The latter is turned … See more
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WebA living cationic polymerization of tetrahydrofuran, using BH3 as the initiator in the … WebSep 25, 2024 · Crown ethers are cyclic ethers containing several oxygen atoms. Crown ethers are named by the number of total atoms in the ring, followed by the word crown and finally the number of oxygen atoms (18-crown-6 for example). 18.8 Thiols and Sulfides. Thiols can be prepared from alkyl halides through reaction with hydrosulfide ion (SH -) or … ph level of olives
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Webpoly(oxytetramethylene)diol TERATHANE650POLYETHERGLYCOL Poly(tetramethylene Oxide) TERATHANE1000POLYETHERGLYCOL TERATHANE1400POLYETHERGLYCOL TERATHANE2000POLYETHERGLYCOL ... TETRAMETHYLENE ETHER GLYCOL 2900 POLYMER POLYTETRAHYDROFURAN 1000 (STABILISED WIT α-hydro-ω-hydroxypoly(oxy … WebDec 22, 2024 · The polyol contains polyol A and polyol B in a molar ratio of 1:1-1:3, wherein … WebMar 5, 2015 · BASF has made bio-based Polytetrahydrofuran 1000 (PolyTHF ® 1000) … ph level of mountain valley spring water