硝化纤维素的β-环糊精接枝改性研究

摘要

采用具有吸附有害物质能力的β-环糊精对硝化纤维素进行改性,有望使硝化纤维素制品具有绿色环保的价值.本文以N-羟甲基丙烯酰胺(NMA)为偶联剂,合成N-羟甲基丙烯酰胺-β-环糊精(β-CD-NMA);再以硝酸铈铵为引发剂,结合合成的β-CD-NMA,将β-环糊精接枝到硝化纤维素(NC)上,并由产物的傅里叶变换红外光谱(FTIR)证明β-CD成功接枝到NC上.作者还研究了β-CD-NMA用量、聚合时间、引发剂浓度、聚合温度等工艺条件对接枝改性的影响规律,得到的最佳工艺参数为:NC用量为0.5g,引发剂浓度为16 mmol·L-1,聚合温度为75℃,β-CD-NMA用量6 g,聚合时间为60 min,接枝率为26％.%Due to the ability of β-cyclodextrin to adsorb harmful substances,the structure of nitrocellulose (NC) is modified by grafting with β-cyclodextrin in order to make its productions more environmentally friendly.N-methylol acrylamide-β-cyclodextrin (β-CD-NMA) was synthesized by using N-methylol acrylamide (NMA) as coupling agent.The β-cyclodextrin (3-CD) was grafted onto NC with ceric ammonium nitrate as initiating agent.The structures and compositions of β-CD,β-CD-NMA and NC-β-CD-NMA were characterized by Fourier transform infrared spectroscopy (FTIR).The results showed that the β-cyclodextrin was grafted onto NC successfully.Furthermore,the effects of specific factors such as CD-NMA dosage,reaction temperature,and concentration of initiator,on grafting percentage were investigated.The optimized process conditions of grafting reaction were as follows:for 0.5 g NC,16 mmol · L-1 ceric ammonium nitrate and 6 g CD-NMA were added,reacting for 60 min at 75 ℃.The optimal grafting percentage was 26％.