【摘要】 随着电子技术的不断发展,利用电子导电凝胶或者离子导电凝胶来制备柔性电子器件受到了越来越多的关注.低共熔溶剂除了具有良好的导电性以外,还具有良好的生物相容性、成本低廉、易于制备等特点,是离子液体的优秀替代品.本文首先利用1-溴代十八烷和二甲氨基丙基丙烯酰胺的季铵化反应,获得具有18个碳的疏水长链的反应性季铵盐单体(3-丙烯酰胺丙基)十八烷基二甲基溴化铵,然后将该单体与氯化胆碱、丙烯酸和甘油混合得到低共熔溶剂,加入光引发剂2-羟基-2-甲基苯丙酮(Irgacure 1173),在365 nm的紫外光下引发聚合,得到了含疏水长链聚丙烯酰胺共聚物离子导电低共熔凝胶.该凝胶最大拉伸伸长率可达1200%,杨氏模量为0.185 MPa,韧性达到了4.2 MJ/m~3;凝胶的电导率为0.315 S/m,能对关节弯曲作出灵敏反应;该凝胶在25℃和60%湿度的智能恒温恒湿培养箱中放置一周后吸水率仅有11.7%,而不含疏水长链的低共熔凝胶的吸水率为24.0%.长链疏水基团的引入不仅提高了凝胶的机械强度,而且极大地提高了该凝胶的抗吸水性能.本研究为低共熔溶剂离子导电凝胶的制备提供了一种更加简单和行之有效的方法,进而为低共熔溶剂离子导电凝胶在柔性电子器件领域的应用提供参考.更多还原

【Abstract】 With the blooming development of electronic technology,the use of electron conductive gel or ionic conductive gel in preparing flexible electronic devices is drawing more and more attention.Deep eutectic solvents are excellent substitutes for ionic liquids because of their good biocompatibility,low cost,and easy preparation,except for good conductivity.In this work,we synthesized a reactive quaternary ammonium monomer(3-acrylamidopropyl)octadecyldimethyl ammonium bromide with a hydrophobic chain of 18 carbons via the quaternization of 1-bromooctadecane and N-dimethylaminopropyl acrylamide at first,then we mixed quaternary ammonium with choline chloride,acrylic acid and glycerol to obtain a hydrophobic deep eutectic solvent,and initialized polymerization in UV light of365 nm to obtain the ionic conductive eutectogel based on polyacrylamide copolymer with long hydrophobic chain.The obtained eutectogel exibits good stretchability(1200%),Young’s modulus(0.185 MPa),toughness(4.2 MJ/m~3),conductivity(0.315 S/m).The eutectogel also shows desireable moisture resistance with the maximum water absorption of11.7 wt% after one week at 25℃ and 60% humidity,while the water absorption of eutectogel without hydrophobic long chains is 24.0 wt%.The introduction of long-chain hydrophobic groups not only improves the mechanical strength of the gels,but also significantly improves moisture resistance of the eutectogel.This work provides a simpler and more effective method for the preparation of ionic conductive eutectogels,which can further provide a reference for the applications of ionic conductive eutectogels in the field of flexible electronic devices.更多还原