以蔗渣木聚糖为主要原料,没食子酸为酯化剂,在丙酮溶剂中合成蔗渣木聚糖没食子酸酯。然后在交联剂N,N′-亚甲基双丙烯酰胺和引发剂过硫酸铵作用下,引发抗坏血酸(LME)、丙烯酸(AA)、丙烯酰胺(AM)与蔗渣木聚糖没食子酸酯发生接枝共聚反应,合成了蔗渣木聚糖没食子酸酯-g-LME/AA/AM复合功能性衍生物。考察了接枝共聚反应时间、反应温度、引发剂浓度、蔗渣木聚糖没食子酸酯与混合单体质量比对接枝率(G)、接枝效率(GE)的影响。确定了适宜的接枝共聚反应条件:反应时间5h,反应温度45℃,引发剂浓度0.008mol/L,m(蔗渣木聚糖没食子酸酯)∶m(混合单体)=1∶2。在该反应条件下,G可达31.02%,GE可达76%。采用傅里叶红外光谱仪、扫描电子显微镜、X射线衍射仪对蔗渣木聚糖和产物的结构进行了表征。

Bagasse xylan gallate was synthesized by using bagasse xylan as the main raw material,gallic acid as the esterification agent in the acetone solvent.The composite modified derivatives of ascorbic acid mono ester/acrylic acid/acrylamide grafted onto bagasse xylan gallate was synthesized by ascorbic acid mono ester (LME),acrylic acid (AA) and acrylamide (AM) grafted onto grafted bagasse xylan gallate in aqueous solution using ammonium persulfate as initiator and N,N′-methylene bisacrylamide as crosslinking agent.The influence of following single factor on the monomer grafting rate(G) and grafting efficiency(GE) was investigated.The optimal conditions of graft copolymerization were as follows:m(gallic acid esterification bagasse xylan)∶m(mixed monomer)=1∶2,temperature 45℃,time 5h,ammonium persulfate concentration 0.008mol/L.And G was 31.02% and GE was 76%.The structure of bagasse xylan and the composite modified derivatives were characterized by IR,SEM and XRD.