Polymer electrolytes based on a homogeneous poly(ethylene glycol) network and their application to polymer actuators
Polymer electrolytes based on a homogeneous poly(ethylene glycol) network and their application to polymer actuators
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DOI：
10.1016/j.electacta.2018.12.142
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发表时间：
2019-03
影响因子：
6.6
通讯作者：
R. Shioiri;H. Kokubo;Tatsuhiro Horii;Yumi Kobayashi;Kei Hashimoto;K. Ueno;M. Watanabe
中科院分区：
文献类型：
--
作者：
R. Shioiri;H. Kokubo;Tatsuhiro Horii;Yumi Kobayashi;Kei Hashimoto;K. Ueno;M. Watanabe
通过两个在聚合物末端具有马来酰亚胺基团和氨基的四臂PEG（tetra-PEG;Mn= 10，000）之间的加成反应，制备了由均匀的聚（乙二醇）（PEG）网络和Li[NTf 2]（[NTf 2]：双（三氟甲磺酰基）酰胺）组成的聚合物电解质。将它们的性质与含有[C2mim][NTf 2]（[C2mim]：1-乙基-3-甲基咪唑）的那些进行了比较。通过马来酰亚胺与氨基之间的迈克尔加成反应，得到了具有均匀网络结构的聚合物电解质膜。观察到含有Li[NTf 2]的聚合物电解质的玻璃化转变温度（Tg）低于使用PEG的常规聚合物电解质的玻璃化转变温度。与传统聚合物电解质相比，低Tg值有助于相对高的离子电导率（在30 °C下，[Li]/[O] = 0.10时为6.3 × 10−5S cm− 1）。此外，由于均匀的网络结构，实现了包括171 kPa的弹性模量和1890 kJ m-3的断裂能的优异的上级机械性能。此外，聚合物致动器的电活性驱动行为，使用聚合物电解质含有Li[NTf 2]或[C2mim][NTf 2]进行了探索。观察到Li[NTf 2]基聚合物致动器与[C2mim][NTf 2]基致动器相比表现出更大的位移和更慢的响应。在这两个致动器中，弯曲方向相反。这些行为很好地描述了一个模型，该模型考虑了离子体积和离子迁移数的聚合物电解质。
Polymer electrolytes consisting of a homogeneous poly(ethylene glycol) (PEG) network and Li[NTf2] ([NTf2]: bis(trifluoromethanesulfonyl)amide) were prepared by an addition reaction between two tetra-arm PEGs (tetra-PEG;Mn= 10,000) with a maleimide group and an amino group at the polymer ends. Their properties were compared with those containing [C2mim][NTf2] ([C2mim]: 1-ethyl-3-methylimidazolium). Michael addition reaction between the maleimide and amino groups yielded polymer electrolyte membranes with homogeneous network structures. The glass transition temperature (Tg) of the polymer electrolytes containing Li[NTf2] was observed to be lower than those of conventional polymer electrolytes using PEG. The lowTgvalues contributed to relatively high ionic conductivity (6.3 × 10−5S cm−1at 30 °C with [Li]/[O] = 0.10) compared to that of conventional polymer electrolytes. Moreover, superior mechanical properties including an elastic modulus of 171 kPa and fracture energy of 1890 kJ m−3were achieved due to the homogeneous network structure. Furthermore, the electroactive actuation behaviors of polymer actuators using polymer electrolytes containing either Li[NTf2] or [C2mim][NTf2] were explored. The Li[NTf2]-based polymer actuator was observed to exhibit larger displacement with slower response compared to the [C2mim][NTf2]-based actuator. The bending directions were opposite in these two actuators. These behaviors were well described by a model that considers the ionic volume and ionic transference number of the polymer electrolytes.