Besides bending sensor, ionic polymer materials can work as pressure sensor based on ion migration and show more potential in engineering application. To explore a better ionic polymer material for pressure sensor, three typical ionic polymer materials, Nafion, poly(vinylidene fluoride)/ionic liquid (IL/PVDF) composite, thermoplastic polyurethane/ionic liquid (IL/TPU) composite, were selected to comparatively investigate the sensing properties under an applied pressure. Ionic polymer pressure sensors with circular truncated cone structure were developed by casting method. Their voltage responses were evaluated by a self-made test platform under a series of step force. The voltage sensitivity and the stability were obtained by performing the tests at different ambient humidity levels. The sensitivity of Nafion sensor was influenced by the ambient humidity heavily, which increased from 8.97 mV N⁻¹ (28.17 mV MPa⁻¹) to 31.11 mV N⁻¹ (97.69 mV MPa⁻¹) as the relative humidity (RH) increasing from 30% RH to 90% RH. In comparison, the voltage responses of IL/TPU sensor and IL/PVDF sensor were rarely influenced by the humidity because of the stability of IL, but strongly related to the content of IL. As the IL content increasing from 30 wt.% to 50 wt.%, the sensitivity of IL/TPU sensor increased from 5.65 mV N⁻¹ (17.74 mV MPa⁻¹) to 16.55 mV N⁻¹ (51.97 mV MPa⁻¹), that of IL/PVDF sensor increased from 14.12 mV N⁻¹ (44.33 mV MPa⁻¹) to 32.23 mV N⁻¹ (101.20 mV MPa⁻¹) monotonously. The underlying mechanisms were revealed based on water exchange in air and ion transport theory qualitatively. IL/PVDF sensor with 50 wt.% IL content shows the best sensing performance in air and is promising for practical application.

除弯曲传感器外，离子聚合物材料还可以用作基于离子迁移的压力传感器，并在工程应用中显示出更大的潜力。为了探索一种更好的压力传感器离子聚合物材料，比较选择了三种典型的离子聚合物材料：Nafion，聚偏二氟乙烯/离子液体（IL / PVDF）复合材料，热塑性聚氨酯/离子液体（IL / TPU）复合材料。研究施加压力下的传感特性。采用铸造法研制了具有圆锥台结构的离子聚合物压力传感器。通过自制的测试平台在一系列步进力下评估了它们的电压响应。通过在不同的环境湿度水平下进行测试，可以获得电压灵敏度和稳定性。^-1（28.17毫伏兆帕^-1）至31.11毫伏Ñ ^-1（97.69毫伏兆帕^-1）作为相对湿度（RH）为30％RH〜90％RH增加。相比之下，由于IL的稳定性，IL / TPU传感器和IL / PVDF传感器的电压响应几乎不受湿度的影响，但与IL的含量密切相关。随着IL含量从30 wt。％增加到50 wt。％，IL / TPU传感器的灵敏度从5.65 mV N ^-1（17.74 mV MPa ^-1）增加到16.55 mV N ^-1（51.97 mV MPa ^-1） IL / PVDF传感器的输出电压从14.12 mV N ^-1（44.33 mV MPa ^-1）增加到32.23 mV N ^-1（101.20 mV MPa）^-1）单调。基于空气中的水交换和离子迁移理论定性揭示了其潜在机理。IL / PVDF传感器的IL含量为50 wt。％，在空气中显示出最佳的传感性能，并有望在实际应用中使用。