Effects of Sodium Chloride on Acetalization of Polyvinyl Alcohol in Water
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概要
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Polyvinyl alcohol (PVA) and some low molecular weight polyhydric alcohols were acetalized with various aldehydes (acet-, propion- and <I>n</I>-butyr-aldehyde) in water, using acid catalysts (hydrochloric acid, methanesulfonic acid and toluenesulfonic acid), and the effects of addition of sodium chloride on the initial rate of the reactions were investigated. Sodium chloride (0-0.7<I>M</I>) generally accelerated acetalization of polyhydric alcohols, and the order of the acceleration effects was PVA>pentaerythritol>1, 3-butanediol>1, 3-propanediol. For example, by addition of 0.7 <I>M</I> sodium chloride the acetalization rate of PVA increased nearly twice. The acceleration effect was nearly independent on the reaction temperature (5-70°C) in the case of the PVA, but increased with decreasing reaction temperature in the cases of the other alcohols. In the cases of the any alcohol the acceleration effect was nearly independent on concentration ([OH] =0.05-0.20<I>M</I>) of the alcohol and the kind and concentration (<I>N</I>/200 and <I>N</I>/10) of catalysts. Hydrolysis of ethyl acetate under the similar conditions was accelerated only slightly by addition of sodium chloride.
- 公益社団法人 高分子学会の論文
公益社団法人 高分子学会 | 論文
- 情報の入口--高分子センサ-とトランスデュ-サ- (情報化社会と高分子)
- 高分子科学最近の進歩--メルトレオロジ-(伸長粘度)
- 高分子系の相分離--特にポリマ-ブレンドについて
- 導電性高分子の磁気緩和--NMRT-1〓1の周波数依存性
- 多機能性高分子の合成 (化学修飾による多機能性高分子)