咪唑阳离子纤维素的合成及性能研究

Synthesis and properties of alkylimidazolium cationic cellulose

以纸浆纤维素为原料,以功能化离子液体氯化1-(3-氯-2-羟丙基)-3-甲基咪唑为阳离子化剂和溶剂,合成了咪唑阳离子纤维素;探讨了反应条件对咪唑阳离子纤维素的取代度的影响,并对其结构与性能进行了表征。结果表明:纸浆纤维素中NaOH质量分数为20%,反应温度为80℃,反应时间为3 h时,咪唑阳离子纤维素的取代度达0.85;红外光谱分析证实纤维素实现了阳离子化;当咪唑阳离子纤维素质量浓度为15 mg/L时,高岭土悬浊液的浊度去除率达92.5%。

Alkylimidazolium cationic cellulose was synthesized using pulp cellulose as raw material and the functional ionic liquid of 1-3-chloro-2-hydroxypropyltrimethylammonium chloride as cationizing agent and solvent.The effects of reaction conditions on the degree of substitution（DS） of alkylimidazolium cationic cellulose were discussed.The structure and properties of alkylimidazolium cationic cellulose were characterized.The result showed that alkylimidazolium catioinc cellulose had the degree of substitution of 0.85 when the mass fraction of NaOH was 20%in cellulose and the reaction temperature and time were 80℃and 3 h, respectively.The infrared spectrography results showed that the cationization of cellulose was successfully implemented.The turbidity removal rate of kaolin suspension was 92.5%when the concentration of alkylimidazolium cationic cellulose was 15 mg/L.