Gao Rui, Song Yuanyuan, Ye Qian, Shen Qingyun, Wang Jifeng, Ruan Mengyuan, Wang Bingjie, Wang Ying
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China.
Laboratory of Advanced Material, Fudan University, Shanghai 200438, China.
ACS Appl Mater Interfaces. 2025 Apr 2;17(13):20296-20306. doi: 10.1021/acsami.5c01250. Epub 2025 Mar 18.
Ionogels have emerged as promising materials for flexible sensors due to excellent thermal stability, high ionic conductivity, and nonvolatility. However, the high ionic liquid content required for optimal conductivity usually compromises the mechanical integrity of the ionogels. Here, we present a strategy through copolymerization of amino-terminated liquid crystalline poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide) (PBDT) and flexible poly(acrylic acid) (PAA), which forms a double-cross-linked ionogel that effectively couples high ionic conductivity with enhanced mechanical properties. By enabling stress transfer between the rigid and soft segments, this approach allows PBDT segments to align under deformation, simultaneously boosting ionic conductivity (1.6 mS cm) and mechanical modulus (43 MPa); meanwhile, the PAA segments offer high flexibility with 900% elongation in the ionogels. The ionogels exhibit exceptional durability over numerous stretching cycles at different strain levels, while maintaining strong thermal sensitivity across a broad temperature range (-60 to 140 °C), making them well-suited for real-time monitoring in diverse environments. This advancement not only overcomes the longstanding trade-off of modulus and conductivity in ionogels but also shows the promise of polymeric ionogels for next-generation sensing technologies.
由于具有出色的热稳定性、高离子导电性和非挥发性，离子凝胶已成为用于柔性传感器的有前途的材料。然而，实现最佳导电性所需的高离子液体含量通常会损害离子凝胶的机械完整性。在此，我们提出了一种通过氨基封端的液晶聚（2,2'-二磺酰基-4,4'-联苯二甲酰胺）（PBDT）与柔性聚（丙烯酸）（PAA）共聚的策略，该策略形成了一种双交联离子凝胶，有效地将高离子导电性与增强的机械性能结合起来。通过使刚性链段和柔性链段之间实现应力传递，这种方法使PBDT链段在变形时能够排列，同时提高离子电导率（1.6 mS/cm）和机械模量（43 MPa）；与此同时，PAA链段在离子凝胶中提供了高达900%的伸长率，具有很高的柔韧性。该离子凝胶在不同应变水平下经过多次拉伸循环后仍表现出出色的耐久性，同时在很宽的温度范围（-60至140°C）内保持强烈的热敏感性，使其非常适合在各种环境中进行实时监测。这一进展不仅克服了离子凝胶中模量和电导率之间长期存在的权衡问题，还展示了聚合物离子凝胶在下一代传感技术中的应用前景。
