PREPARATION OF AMINO CELLULOSE BY THE REDUCTION OF DIOXIME CELLULOSE

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  • ジオキシムセルロースの還元によるアミノセルロースの合成
  • ジオキシムセルロース ノ カンゲン ニ ヨル アミノセルロース ノ ゴウセイ

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Abstract

Purified cotton linter was oxidized with NaIO4 to dialdehyde cellulose, and oximated with NH2 OH•HCl. The dioxime cellulose obtained was reduced to amino cellulose with NaBH4 in alkaline solutions. In the preparation of amino cellulose, the optimum conditions of the oximation and the amination were studied.<br>The rate constant of oximation, which was calculated from the N% of dioxime cellulose obtained, was 4.18 × 10-4 l/mol•min. at 20°C, and the activation energy was 1.98 kcal/mol. By treating dialdehyde cellulose with a 0.4M NH2OH•HCI solution at pH 5.20 for 90min. at 25°C, about 97-100% of carbonyl groups was converted to oxime groups. The dioxime cellulose were unstable to alkaline solutions, and the content of oxime groups decreased by the treatment with NaOH solutions (pH>11).<br>The maximum degree of amination was attained by the treatment with a 10% NaBH4 solution at an initial pH of 9.5 for 24 hrs. at 25°C, and about 50% of oxime groups were aminated. When the concentration of NaBH4 was higher than 10%, the degree of amination decreased. The degree of amination decreased when the initial pH value was either below 8.5 or above 10.5. When the reaction time was longer than 24 hrs., the content of amino groups resulted was decreased by the attack of alkaline solutions.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 30 (5-6), T266-T272, 1974

    The Society of Fiber Science and Technology, Japan

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