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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Polypropylene glycol ： ウィキペディア英語版 Polypropylene glycol Polypropylene glycol or polypropylene oxide is the polymer of propylene glycol. Chemically it is a polyether. The term polypropylene glycol or PPG is reserved for low to medium range molar mass polymer when the nature of the end-group, which is usually a hydroxyl group, still matters. The term "oxide" is used for high molar mass polymer when end-groups no longer affect polymer properties. In 2003, 60% of the annual production of propylene oxide of 6.6×106 tonnes was converted into the polymer.〔''A Highly Active, Isospecific Cobalt Catalyst for Propylene Oxide Polymerization'' Kathryn L. Peretti, Hiroharu Ajiro, Claire T. Cohen, Emil B. Lobkovsky, and Geoffrey W. Coates J. Am. Chem. Soc., 127 (33), 11566 -11567, 2005. (Abstract )〕 == Polymerization == Polypropylene glycol is produced by ring-opening polymerization of propylene oxide. The initiator is an alcohol and the catalyst a base, usually potassium hydroxide. When the initiator is ethylene glycol or water the polymer is linear. With a multifunctional initiator like glycerine, pentaerythritol or sorbitol the polymer branches out. Conventional polymerization of propylene oxide results in an atactic polymer. The isotactic polymer can be produced from optically active propylene oxide, but at a high cost. A salen cobalt catalyst has recently been reported to provide isotactic polymerization of the racemic propylene oxide 1. 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「Polypropylene glycol」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.