カチオン性高分子の合成とその応用　Ｉ　　ポリアクリルアミドのホフマン分解

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書誌事項

タイトル別名
  • Hofmann Degradation of Polyacrylamide
  • ポリアクリルアミド ノ ホフマン ブンカイ カチオンセイ コウブンシ ノ ゴウ

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説明

The Hofmann degradation of polyacrylamide (I) was followed by the measurements of the hypochlorite (II), N-chloroamide (III), amino and carboxyl groups. In order to determine II and III separately, the difference in their reactivity with ethyl malonate was first utilized. Amino and carboxyl groups were measured by the colloid titration. The various factors on the yield of amine unit were also studied. The rate of the Hofmann degradation of I was a few hundred to a thousand and few hundred times as fast as that of low molecular monoamides or the carbamoyl derivatives of polyhydroxy-polymers. Therefore, chloroamide groups of I were easily converted to amine unit at 0--15°C, while other chloroamide groups generally are extremely stable at the similar temperature. The yields of amine unit increased with decreasing reaction temperature and increasing concentration of sodium hydroxide, e. g., the solution containing I (0.60mol/l), NaOCl (0.61 mol/l) and NaOH (4.5mol/l) produced the polymer containing ca. 90% amine unit when the solution was allowed to stand at 0°C for 24hr. Main side reaction was assumed to be the formations of urea derivatives and carboxyl groups. Sodium hypochlorite was more effective for the Hofmann degradation than sodium hypobromite.

収録刊行物

  • 高分子論文集

    高分子論文集 33 (6), 309-316, 1976

    公益社団法人 高分子学会

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