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Conductive polyurethane elastomer electrolyte (PUEE) materials for anodic bonding
RSC Advances ( IF 3.9 ) Pub Date : 2020-4-1 , DOI: 10.1039/c9ra10944g
Haocheng Zhao 1, 2 , Weixuan Zhang 3 , Xu Yin 1 , Yuling Wu 3 , Chao Du 1 , Weigang Zhao 1 , Li Zhao 1, 2 , Cuirong Liu 1
Affiliation  

Polyurethane elastomer electrolyte (PUEE) represents a promising class of polymer solid electrolytes for the preparation and packaging of flexible devices by anodic bonding. In this work, PUEEs were designed and prepared via a pre-polymerization method and cured at room temperature using polypropylene glycol (PPG), toluene-2,4-diisocyanate (TDI) and 1,4-butanediol (BDO) in the presence of varying amounts of lithium bis(trifluoromethanesulphonyl)imide (LiTFSI). All PUEEs exhibited high thermal stability and conductivity, with the highest ionic conductivity of 9.6 × 10−5 S cm−1 for PUEE6 (n[NHCOO]/Li+ = 1) at 55 °C. The results showed that LiTFSI was dissolved completely in the polyurethane matrix, and the complexing reactions occurred between the lithium ions and the polar groups of polyurethane. After that, the prepared PUEE and the Al sheet were successfully joined by the anodic bonding process. The microstructures of the bonded interface between PUEE and the Al sheet with a clear intermediate bonding layer could be observed in the cross-section scanning electron microscopy (SEM) images, and the elements in each layer were also detected by energy dispersive spectroscopy (EDS), which indicated that the PUEE and the Al sheet were bonded together. The maximum tensile strength for bonded PUEE6/Al was up to 0.45 MPa. All these results demonstrated that the prepared PUEE material would be a promising candidate for the preparation and packaging of flexible devices by anodic bonding.

中文翻译:

用于阳极键合的导电聚氨酯弹性体电解质 (PUEE) 材料

聚氨酯弹性体电解质(PUEE)代表了一类很有前途的聚合物固体电解质,用于通过阳极键合制备和包装柔性器件。在这项工作中,通过预聚合方法设计和制备 PUEE,并在室温下使用聚丙二醇 (PPG)、甲苯-2,4-二异氰酸酯 (TDI) 和 1,4-丁二醇 (BDO) 在不同量的双(三氟甲磺酰)亚胺锂 (LiTFSI)。所有的PUEE都表现出高的热稳定性电导率,对于PUEE6 ( n [NHCOO]/Li += 1) 在 55 °C 时。结果表明,LiTFSI完全溶解在聚氨酯基体中,锂离子与聚氨酯的极性基团发生络合反应。之后,制备好的 PUEE 和 Al 片材通过阳极键合工艺成功连接。在横截面扫描电子显微镜 (SEM) 图像中可以观察到 PUEE 与具有清晰中间粘合层的 Al 片材之间的粘合界面的微观结构,并且还可以通过能量色散光谱 (EDS) 检测各层中的元素,这表明 PUEE 和 Al 片材粘合在一起。粘合的 PUEE6/Al 的最大拉伸强度高达 0.45 MPa。
更新日期:2020-04-01
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