基于离子液体协同法的双交联结构细菌纤维素/聚丙烯酰胺凝胶聚合物电解质构建

Bacterial cellulose/polyacrylamide hydrogel polymer electrolyte with dual-crosslinked network based on ionic liquid synergistic method

为实现凝胶电解质性能间的平衡,以氧化细菌纤维素为基体,分别采用3种阴离子类咪唑型离子液体与其实现离子交联,同时将丙烯酰胺在交联体中进行原位自由基聚合,制备细菌纤维素/聚丙烯酰胺双交联结构的凝胶聚合物电解质。其中阴离子类咪唑型离子液体分别是1-乙基-3-甲基咪唑四氟硼酸盐(EMIMBF_(4))、1-乙基-3-甲基咪唑六氟磷酸盐(EMIMPF_(6))和1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐(EMIMTFSI),在构筑双交联结构凝胶聚合物电解质中起到了关键的协同作用。结果表明:在以EMIMBF_(4)为协同剂时,制备的凝胶聚合物电解质具有最优的力学性能和离子电导率;断裂伸长率为38.36%,拉伸强度为175.25 kPa,离子电导率达到20.16 mS/cm。

In order to achieve balance between different properties of the gel electrolyte,bacterial cellulose/polyacrylamide gel-polymer electrolyte with dual-crosslinked network was prepared by anionic imidazole-type ionic liquid and oxidized-bacterial cellulose,followed by crosslinking by acrylamide using in-situ free radical polymerization method.The anionic ionic liquids were 1-ethyl-3-methyl-imidazolium tetrafluoroborate(EMIMBF_(4)),1-ethyl-3-methyl-imidazolium hexafluorophosphate(EMIMPF_(6)),and 1-ethyl-3-methyl-imidazolium bistrifluoromethosulfonimide(EMIMTFSI),respectively,which played important synergistic role in the construction of double crosslinked hydrogel polymer electrolyte.The results show that the gel polymer electrolyte based on EMIMBF_(4) has excellent mechanical properties and ionic conductivity,with its elongation at break being 38.60%,its tensile strength 175.25 kPa,and its ionic conductivity reached 20.16 mS/cm.