丙烯酸单体接枝纳米纤维素晶须的研究

Study of Nanocellulose Whiskers Grafted with Acrylic Monomers

摘要:

根据自由基聚合原理，用K2S2O8为引发剂，在纳米纤维素晶须（NCW）上接枝丙烯酸单体（AA），制备出丙烯酸接枝改性的纳米纤维素晶须。通过红外光谱（FTIR）、透射电镜（TEM）、热重分析(TGA)等测试方法对接枝产物的性能进行了分析，并采用电导滴定的方法计算接枝率。考察了单因素反应条件对接枝率和接枝效率的影响。实验结果表明，在引发剂用量为4mmol/L，引发时间为5min，纳米纤维素晶须与丙烯酸单体摩尔比为1:1.5，反应时间为6h时，得到了接枝率较高的接枝产物。通过丙烯酸改性使得纳米纤维素晶须的分散稳定性和热稳定性提高。

Abstract:

Based on the mechanism of free radical polymerization and graft copolymerization, nanocellulose whiskers(NCW) was polymerized with acrylic monomer using potassium persulfate as the initiator. The graft copolymer was characterized using several analytical techniques such as FTIR, TEM, TGA, and the conductometric titration method, which was used to calculate the grafting yield. The effects of reaction conditions on the graft yield and graft efficiency were investigated. It is showed that the graft copolymer with higher grafting yield and graft efficiency was obtained when the contents of initiator is 4mmol/L, the molar ratio of NCW and AA is 1:1.5, the initiate time and reaction time were 10min and 6h, respectively.The acrylic monomers graft on NCW can improve the dispersion stability and thermal stability of NCW.