水溶液中におけるアクロレインオキシムの熱および触媒アニオン重合
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概要
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Thermal and lithium hydroxide (LiOH) -catalyzed polymerizations of acrolein oxime (ACM) was investigated in aqueous solution and empirical equations for the rate of polymerization (<I>R</I><SUB>p</SUB>) were derived as a function of the molecular aggregate of the oxime<BR><I>R</I><SUB>p</SUB>∝ [(AOM) <SUB>2-8</SUB>] <SUP>1.5</SUP> for thermal polymerization<BR><I>R</I><SUB>p</SUB>∝ [(AOM) <SUB>2-8</SUB>] <SUP>1.06</SUP> [LiOH] <SUP>0.94</SUP> for catalyzed polymerization<BR>The initiating species is an anion, CH<SUB>2</SUB>=CH-CH=N-OΘ, arising from the ionic dissociation of the molecular aggregates in the thermal polymerization and from the reaction of the oxime with lithium hydroxide in the catalyzed polymerization. Different from the polymerization in bulk or in organic solvents, free ionic mechanism is operative in these polymerizations to form polymers of low molecular weight (1000-2000) preferentially by chain transfer reaction to water and monomer. A side reaction is remarkable in the catalyzed polymerization ; hydroxy anion, arising from chain transfer to water, adds to the pendant oxime group to induce branching and cyclization of the polymer, thus making the polymer insoluble in organic solvents.
- 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)