离子液体中微波辐射合成纤维素丙烯酰胺接枝共聚物

Preparation of Cellulose Acrylamide Grafted Copolymer in Ionic Liquid with Microwave Irradiation

以离子液体为反应介质,丙烯酰胺为单体,在不加任何引发剂的情况下,用微波辐射代替常规的加热方式,在均相条件下快速合成了纤维素与丙烯酰胺的接枝共聚物。研究了影响接枝效果的各种因素（单体及交联剂的用量,微波强度以及反应时间等）,并利用红外光谱（FT-IR）、扫描电镜（SEM）、热重分析（TGA）等手段对其结构及表面形态进行表征。结果表明,通过微波辐射,纤维素在离子液体中1 min便可完成接枝反应,与常规加热时间（0.5-5 h）相比,该方法大大缩短了反应时间。此外,还探讨了微波下纤维素接枝共聚的自由基反应机理。

Acrylamide was grafted onto cellulose in homogeneous phase in the absence of any radical initiator under microwave（MW） irradiation using 1-butyl-3-methylinidazolium chloride ionic liquid as the reaction medium.The use of microwave resulted in a dramatic reduction of reaction time： 1 min irradiation was sufficient,compared with 0.5 to 5 hours as conventional heating was used.The effects of reaction parameters,such as monomer concentration,crosslilnker dosage,MW power and exposure time were investigated.The structure of the grafted copolymer was confirmed by FT-IR spectrum,TGA and SEM.A probable free radical mechanism for grafting under microwaves was also proposed.