Abbreviated as PEG or PEO. Also called polyethylene oxide, polyox, and carbowax. Polyethers with a molecular weight of 200 or more, as shown in the following general formula, have a high degree of polymerization of 10,000 or more. In industrial production, they are produced by ring-opening polymerization of ethylene oxide in the presence of a Friedel-Crafts catalyst, acid, or alkali catalyst. High molecular weight polyethylene glycols are stable, nonvolatile, odorless, and have good crystallinity. Due to the hydrophilic nature of the ether group, they are easily soluble in water and insoluble in aliphatic hydrocarbons, but soluble in many aromatic hydrocarbons. They are widely used alone or in mixtures as lubricants, solvents, and pharmaceutical bases, as well as intermediates in the rubber, food, pharmaceutical, cosmetic, paper, and petrochemical industries. Polyethylene glycols with a molecular weight of 700 or less are transparent or milky liquids, and those with a molecular weight of 1000 or more are grease-like or waxy. Liquid polyethylene glycols are mainly used as nonionic surfactants after esterification, and solid polyethylene glycols are used as raw materials in the rubber, pharmaceutical, and textile industries. [CAS 25322-68-3] Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition |
略称PEGまたはPEO.ポリエチレンオキシド,ポリオックス,カーボワックスともいう.次の一般式で示される分子量200以上のポリエーテルで,分子量10000以上の高重合度のものもある.工業的には,フリーデル-クラフツ触媒,酸あるいはアルカリ触媒共存下でエチレンオキシドの開環重合により製造される.高分子量のものは安定で,不揮発性,無臭であり,結晶性もよい.エーテル基の親水性のため,水に易溶,脂肪族炭化水素には不溶であるが,多くの芳香族炭化水素に可溶である.単独あるいは混合して潤滑油,溶媒,医薬基剤として,またゴム,食品,薬品,化粧品,紙,石油化学工業の中間体として広く使用されている.分子量700以下のものは透明または乳白色の液体で,1000以上のものは,グリース状またはろう状である.主として,液状ポリエチレングリコールは,エステル化して非イオン界面活性剤として,また固体状ポリエチレングリコールは,ゴム,薬品,繊維工業の原料として用いられている.[CAS 25322-68-3] 出典 森北出版「化学辞典(第2版)」化学辞典 第2版について 情報 |
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