ポリ(2-メチル-N-ビニルイミダゾール)とn-アルキルブロミドとの反応

概要

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Poly (2-methyl- N-vinylimidazole) was let to react with n-butyl, n-hexyl, n-octyl and n-dodecyl bromides, respectively. The resulting n-alklyimidazolium bromide polymers, except the butylimidazolium polymer, were insoluble in water when the reaction advanced. But these waterinsoluble polymers became soluble when they were treated with hydrogen bromide. All the polymers were also soluble in methanol and ethanol. It was found that the modified polymers possess higher viscosity and lower surface tension in aqueous solutions than the original polymers. However the introduction of such a long and hydrophobic chain as n-dodecyl group into the polymer chain was found to give rather opposite properties. The results of these experiments were discussed from a standpoint of the molecular shape of the polymer in solution. The subsidence of kaolin suspension by the dodecyl imidazolium bromide polymer was also investigated ; the final sedimentation volume was found to be smaller in proportion to the content of dodecyl groups in the polymer chain, and a clear supernatant solution was obtained without redispersion of the precipitates. Although a quantitative corelation between chain length and the content of alkyl bromides and the properties of imidazolium polymers was not obtained, it was shown that a suitably modified polymer will be useful as a cationic polysoap.
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