微波辅助离子液体法对纤维素的均相改性研究

Homogeneous Modification of Cellulose by Microwave Assisted Ionic Liquid

以离子液体1-丁基-3-甲基咪唑氯盐(BMIMCl)为溶剂,采用微波辐射代替常规的加热技术,对纤维素进行均相改性研究。首先进行微波辐射下纤维素在离子液体中的溶解,研究微波辐射温度和溶解时间的影响;其次进行纤维素与氯乙酰氯在微波辅助离子液体中的均相乙酰化研究,利用FT-IR、1H-NMR对聚合物进行了表征,探讨微波辐射功率、反应温度、反应时间和氯乙酰氯用量对纤维素取代度的影响。结果表明,微波加热有利于纤维素溶解和酯化,辐射时间和温度提高均会增加纤维素溶解量,酯化剂用量和微波辐射时间对反应影响较大。

Cellulose was modified homogeneously via microwave instead of the conventional heating assisted by ionic liquid 1-butyl-3-methyl imidazole chloride （BMIMCI）. Cellulose was first dissolved in BMIMC1 under microwave irradiation. The influence of microwave irradiation temperature and microwave irradiation was investigated. The dissolved cellulose was homogeneously modification under microwave irradiation using choroacetyl chloride as acylating agent. The obtained product was characterized by FT-IR and 1H-NMR. The influence of microwave irradiation power, reaction temperature, reaction time and the dosage of chloroacetyl chloride on substitution degree of cellulose was discussed. The results showed that microwave heating was helpful to the dissolution of cellulose and esteriflcation, radiation time and temperature rise would increase the amount of dissolving cellulose, esterifying agent and microwave radiation time had bigger influence on the reaction.