反相微乳液法制备芭蕉芋淀粉接枝丙烯酸盐共聚物

摘要

Canna edulis Ker starch-acrylic acid graft copolymer was prepared by an inverse microemulsion method using ammonium persulfate as the initiator and N,N＇-meyhylene-bisacrylamide as cross-linking agent under nitrogen protection.An inverse emulsion system containing Canna edulis Ker starch was formed under an oil-to-water ratio of 1.2：1,complex emulsifier amount of 30%,and emulsifier HLB（hydrophilic-lipophilic balance） of 7.36.The optimal copolymerization conditions of Canna edulis Ker starch and acrylic acid were acrylic acid amount of 16 mL,initiator amount of 3.5%,cross-linking agent amount of 0.8%,and neutralization degree of acrylic acid of 70%.The water-absorbing capacity of graft copolymers prepared under the optimal conditions was 1340 g/g.Meanwhile,infrared spectral analysis revealed that acrylic acid was successfully grafted onto Canna edulis Ker starch.%在氮气保护的环境下,以过硫酸铵为引发剂、N,N＇-亚甲基双丙烯酰胺为交联剂,采用反相微乳液法制备芭蕉芋淀粉接枝丙烯酸盐共聚物;确定含芭蕉芋淀粉的稳定反相微乳液体系的制备工艺：油水比为1.2：1、复合乳化剂用量为30%、乳化剂的亲水亲油平衡值（hydrophile lipophylic balance,HLB）为7.36;利用正交试验法优化利用反相微乳液法制备淀粉接枝丙烯酸盐共聚物的工艺条件,在最佳工艺（单体丙烯酸的用量16mL、引发剂用量3.5%、交联剂用量0.8%、单体丙烯酸中和度70%）条件下,制备出芭蕉芋淀粉接枝丙烯酸盐共聚物的吸水倍率可达1340g/g。红外光谱分析结果表明,聚合过程中芭蕉芋淀粉与丙烯酸发生了接枝共聚反应。