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|Section2= }} Polytetrahydrofuran, also called poly(tetramethylene ether) glycol or poly(tetramethylene oxide), is a chemical compound with formula ()''n''OH2 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 commercially available as polymers of low average molecular weights, between 250 and 3000 daltons. In this form it is a white waxy solid that melts between 20 and 30 °C. The commercial product can be processed further into polymers with molecular weights of 40,000 and higher. The product is sold under various trade names including Terathane from Invista〔(【引用サイトリンク】title=Physical properties for the range of Terathane PTMEG polymers )〕 and PolyTHF from BASF.〔(【引用サイトリンク】title=BASF Intermediates )〕 The BASF plant in Ludwigshafen at one point was producing 250,000 metric tons per year.〔(【引用サイトリンク】 url = http://www.intermediates.basf.com/chemicals/spandex/global-player )〕 ==Applications== The main use of polytetrahydrofuran is to make elastic fibers such as spandex (elastan) for stretchable fabrics〔 and for polyurethane resins. The latter are polyurethane prepolymers dissolved in solvent.〔Ashford's Dictionary of Industrial Chemicals, third edition, 2011, page 7587〕 They are used in the manufacture of artificial leather. These elastomers are either polyurethanes made by reacting PTMEG with diisocyanates, or polyesters made by reacting PTMEG with diacids or their derivatives.〔(【引用サイトリンク】title=Uses of PTMEG polyols )〕 The polymer is also a starting material for thermoplastic polyurethane, thermoplastic polyesters, polyetheramide and cast polyurethane elastomers, used for instance in the wheels of roller skates and skateboards. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polytetrahydrofuran」の詳細全文を読む スポンサード リンク
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