离子液体中自由基反应制备纤维素接枝共聚物

Preparation of a Novel Cellulose Graft Copolymers by Radical Polymerization in Ionic Liquids

通过季胺化反应合成离子型液体1-丁基,3-甲基氯化咪唑[Bmin]Cl,13C NMR结果表明有效地合成了目标产物。将脱脂棉纤维素溶解于合成的离子液体中,研究讨论了[Bmin]Cl对其溶解性能及溶解前后纤维素的变化。基于自由基聚合反应的原理,使纤维素在[Bmin]Cl中均相与丙烯酰胺接枝共聚,FT-IR证明了接枝产物的生成,凯氏定氮法测量计算得接枝率达60%。正交试验结果表明各因素对接枝率的影响的主次顺序为:引发剂与纤维素的质量比>反应时间>单体与纤维素的质量比>反应温度。

Quaternization of methylimidazole was carried out to make ionic liquids, 1-butyl-3-methylimidazolium chloride, and 13↑C NMR proved the target product. Degreasing cotton was dissolved and regenerated in 1-butyl-3- methylimidazolium chloride, to study its capability of dissolving cellulose and the changes of cellulose during the dissolving process. Homogeneous graft copolymerization of cellulose and acrylamide in ionic liquids was carried out. FT -IR demonstrated that the product was cellulose-g-polyacrylamide, and the rate graftin dahl method. The result of orthogonal test illustrated the order of the effects of factors ： the cellulose 〉 reaction time 〉 mass ratio of monomer to cellulose 〉 reaction temperature. g reached 60% by Kjel- mass ratio of initiator to cellulose 〉 reaction time 〉 mass ratio of monomer to cellulose 〉 reaction temperature.