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Self-Healable and Remoldable Transparent Polyurethane Film with High Dielectric Constant from the Synergistic Effect between Lithium Salt and Ionic Liquid
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-30 , DOI: 10.1021/acs.iecr.9b06977 Danyi Li 1 , Li Yuan 1 , Guozheng Liang 1 , Aijuan Gu 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-30 , DOI: 10.1021/acs.iecr.9b06977 Danyi Li 1 , Li Yuan 1 , Guozheng Liang 1 , Aijuan Gu 1
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The rapid development of new-generation flexible touch display panels puts forward more requirements on the overlays, not only including colorlessness and transparency but also having self-healing and remolding abilities as well as high dielectric constant. Herein, new self-healable and remoldable polyurethane films (PULEx) with high dielectric constant have been developed through building of reversible cross-linked networks with special synergistic effect between lithium salt and ionic liquid. The integrated performance of PULEx was systematically investigated. Results show that as the loadings of lithium salt and ionic salt increase, films show increased dielectric constant and self-healing ability. The film with suitable composition (PULE7.5) has the best comprehensive performance; its dielectric constants (104–106 Hz) range from 9.6 to 6.1, which are comparable to those of glass (commonly used overlay for rigid capacitive touchscreen panels). The construction of reversible covalent cross-linking endows PULE7.5 with good mechanical strength, high self-healing efficiency after complete fracture (92.7%), and high recovery of mechanical properties after remolding (91.8%). In addition, the colorless PULE7.5 has high transparency (90.7% transmittance at 550 nm) and can freely convert among three shapes of bending, scrolling, and S-shape, showing great prospects in fabricating flexible display devices. The mechanism behind these outstanding integrated performances of PULE films is investigated through correlation with structures.
中文翻译：
锂盐与离子液体协同作用的高介电常数自修复可重塑透明聚氨酯薄膜
新一代柔性触摸显示面板的迅速发展，对覆盖层提出了更高的要求，不仅包括无色和透明性，还具有自修复和重塑能力以及高介电常数。在此，通过建立具有锂盐和离子液体之间的特殊协同作用的可逆交联网络，开发了具有高介电常数的新型自修复和可重塑聚氨酯薄膜（PULE x）。PULE x的综合性能被系统地调查了。结果表明，随着锂盐和离子盐含量的增加，薄膜的介电常数和自愈能力增强。具有合适成分（PULE7.5）的薄膜具有最佳综合性能；其介电常数（10 4 –10 6Hz）的范围从9.6到6.1，与玻璃（刚性电容式触摸屏面板的常用覆盖层）相当。可逆共价交联结构赋予PULE7.5良好的机械强度，完全断裂后的自愈效率高（92.7％），重塑后机械性能的恢复率高（91.8％）。另外，无色PULE7.5具有高透明性（在550nm下的透射率为90.7％），并且可以在弯曲，滚动和S形的三种形状之间自由地转换，在制造柔性显示装置中显示出广阔的前景。通过与结构的相关性研究了PULE薄膜这些出色的综合性能背后的机理。
更新日期：2020-03-30
中文翻译：
锂盐与离子液体协同作用的高介电常数自修复可重塑透明聚氨酯薄膜
新一代柔性触摸显示面板的迅速发展，对覆盖层提出了更高的要求，不仅包括无色和透明性，还具有自修复和重塑能力以及高介电常数。在此，通过建立具有锂盐和离子液体之间的特殊协同作用的可逆交联网络，开发了具有高介电常数的新型自修复和可重塑聚氨酯薄膜（PULE x）。PULE x的综合性能被系统地调查了。结果表明，随着锂盐和离子盐含量的增加，薄膜的介电常数和自愈能力增强。具有合适成分（PULE7.5）的薄膜具有最佳综合性能；其介电常数（10 4 –10 6Hz）的范围从9.6到6.1，与玻璃（刚性电容式触摸屏面板的常用覆盖层）相当。可逆共价交联结构赋予PULE7.5良好的机械强度，完全断裂后的自愈效率高（92.7％），重塑后机械性能的恢复率高（91.8％）。另外，无色PULE7.5具有高透明性（在550nm下的透射率为90.7％），并且可以在弯曲，滚动和S形的三种形状之间自由地转换，在制造柔性显示装置中显示出广阔的前景。通过与结构的相关性研究了PULE薄膜这些出色的综合性能背后的机理。
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