纳米纤化纤维素接枝AMPS及其在高吸水树脂中的应用研究

Preparation of Graft Copolymer of AMPS and Nanofibrillatedcellulose and its Application in Superabsorbents

关键词:  纳米纤维素（NFC）  AMPS  接枝改性  高吸水树脂

Key Words:nanofiberillated cellulose  AMPS  grafting modification  superabsorbent polymers

摘要:以纳米纤化纤维素（NFC）为基材，使用硝酸铈铵为引发剂，将抗盐性单体2-丙烯酰胺基-2-甲基丙磺酸（AMPS）接枝到NFC表面，使得接枝后的NFC更亲水和耐盐，并研究了AMPS-NFC在丙烯酸基高吸水树脂中的应用。结果显示，AMPS的用量越多，接枝到NFC表面的AMPS就越多，所制备的吸水树脂的吸收性能越好，与添加TEMPO氧化制备的NFC相比，添加2%用量AMPS-NFC（接枝量为1.725 mmol/g）制得的高吸水树脂的吸收性能有显著提高，其中吸水量由380 g/g增加至620 g/g，吸收去离子水的速度增加13.3%，而吸收0.9%NaCl的速度增加20.8%。

Abstract:Nanocellulose have become fascinating functional material because of its unique properties, but in order to adapt the interfacial properties or adjust the corresponding effect, the chemical modifications are prerequisite, sometimes unavoidable. This study 2-acrylamido-2-methylpropane sulfonic acid (AMPS) were grafted onto the surface of NFC via the ceric ammonium nitrate-induced polymerization process to prepare a graft copolymer AMPS-NFC, then further applied to AMPS-NFC/PAA based superabsorbent manufacture by UV induced polymerization process. The results indicated that the grafted ratio of AMPS increased with AMPS addition amount increase , the resultant superabsorbent resin had higher absorbency. Compared to the control (TEMPO-NFC), at a 2wt% of AMPS-NFC(the amount of grafted AMPS was 1.725 mmol/g) addition, the water absorbency of the resultant PAA hydrogel/ AMPS-NFC composites increased from 380 to 620 g/g, while the absorbing rate in deionized water and 0.9% NaCl solution increased by 13.3% and 20.8%, respectively.