通过在N，N-二甲基甲酰胺中的反应性溶解来对氯乙酰基纤维素进行胺化和硫醇化。,Carbohydrate Polymers

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通过在N，N-二甲基甲酰胺中的反应性溶解来对氯乙酰基纤维素进行胺化和硫醇化。
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2014-12-03 , DOI: 10.1016/j.carbpol.2014.03.077
Sara R Labafzadeh ₁ , Kashmira Vyavaharkar ₁ , Jari S Kavakka ₁ , Alistair W T King ₁ , Ilkka Kilpeläinen ₁

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本文介绍了氨基乙酰基纤维素和硫代乙酰基纤维素的合成与表征。首先使用N，N-二甲基甲酰胺（DMF）作为反应介质，用氯乙酰氯对纤维素进行化学修饰。在6当量的存在下反应实现了纤维素羟基的最大取代。在60°C下于24小时内除去氯乙酰氯。然后通过分馏介质来回收DMF。在下一步中，使氯乙酰基纤维素与仲胺或硫醇反应。反应最初在热DMF中是异质的。随着反应的进行，获得均匀的混合物。通过这种方法获得了高度取代的纤维素衍生物。通过ATR-1R和NMR光谱证实了反应的成功。各种纸浆被用作纤维素源。发现所得产物是热稳定的并且具有约120℃的玻璃化转变温度。凝胶渗透色谱法（GPC）表明发生了纤维素主链的降解。然后将纤维素衍生物加工成膜。然后，从其湿气和氧气的阻隔性能以及拉伸性能的角度研究了它们作为包装膜的潜力。

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Amination and thiolation of chloroacetyl cellulose through reactive dissolution in N,N-dimethylformamide.

The synthesis and characterization of aminoacetyl cellulose and thioacetyl cellulose is presented in this paper. Cellulose was first chemically modified with chloroacetyl chloride using N,N-dimethylformamide (DMF) as reaction medium. The maximum substitution of hydroxyl groups of cellulose was achieved reacting in the presence of 6 equiv. of chloroacetyl chloride over 24 h at 60 °C. DMF were then recovered by fractional distillation of the media. In the next step, chloroacetyl cellulose was reacted with either secondary amines or thiols. The reactions were initially heterogeneous in hot DMF. As the reactions proceeded, homogenous mixtures were obtained. Highly substituted cellulose derivatives were achieved via this method. The success of the reactions was confirmed by ATR-IR and NMR spectroscopy. Various pulps were used as cellulose source. The resulting products were found to be thermally stable and have glass transition temperatures around 120 °C. Gel permeation chromatography (GPC) indicated that degradation of the cellulose backbone had occurred. The cellulose derivatives were then processed into films. Their potential, as packaging films, was then studied from the view-point of their moisture and oxygen barrier properties, as well as their tensile properties.

更新日期：2019-11-01

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