クロロメチル化ポリスチレンのアミノ化反応に及ぼす溶媒効果
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概要
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The effect of temperature on the amination of chloromethylated polystyrene (CMPS) was investigated in various solvents. It seemed reasonable to consider that the quarternization of CMPS with triethylamine (TEA) is a nucleophilic displacement reaction and the rate is dependent upon the concentrations of both the free amine and chloromethyl group. The reaction rates increased with increasing the cohesive energy density (CED) and <I>E</I><SUB>T</SUB> values of the solvents. In a protic solvent, a large activation energy was obtained owing to the hydrogen-bonding of TEA with the solvent. On the other hand, in the case of aprotic solvents, the activated complex was strongly solvated and the amination was remarkably affected by the entropy of activation. The correlations beween the CED value of the solvent vs. the activation energy and entropy of activation have a peak point in the range of 130 to 150cal/m<I>l</I>. This may be explained by the compensation effect between the activation energy and the entropy of activation.
- 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)