聚苯胺导电水凝胶基柔性应变传感器的制备

以蒙脱土改性聚丙烯酰胺水凝胶为基底，通过苯胺预渗透方法制备聚苯胺浓度梯度分布的聚苯胺/改性蒙脱土/聚丙烯酰胺（PANI/DCM/PAM）导电水凝胶（PDPG），重点考察力学性能和应变传感性能。结果表明：壳聚糖改性蒙脱土的分散液稳定性明显提高；苯胺预渗透5 s、脱水5 h所得PDPG水凝胶的拉伸强度和断裂伸长率分别达到194 kPa和685%；改变苯胺预渗透时间可以调控PDPG水凝胶的导电性能和传感性能；当应变为0~400%时，PDPG水凝胶的灵敏度（GF）最高值为7.02。基于PDPG导电水凝胶的柔性应变传感器能够实现对人体全尺度运动的监测，并具有很好的循环稳定性。

Preparation of polyaniline conductive hydrogel based flexible strain sensor

Polyaniline/modified montmorillonite/polyacrylamide (PANI/DCM/PAM) conductive hydrogels (PDPG) with polyaniline concentration gradient distribution were prepared by aniline pre-penetration method using montmorillonite modified polyacrylamide hydrogel as the substrate. The mechanical properties and strain sensing performance were investigated. The results showed that the stability of the chitosan-modified montmorillonite dispersion was significantly improved. The tensile strength and elongation at break of the PDPG hydrogel prepared by aniline pre-penetration for 5 s and dehydration for 5 h reached 194 kPa and 685%, respectively. The conductivity and sensing performance of PDPG hydrogels can be regulated by varying the pre-penetration time of aniline. In the strain range of 0 to 400%, the maximum sensitivity (GF) of PDPG hydrogel was 7.02. The flexible strain sensor based on PDPG conductive hydrogels can monitor the full-scale motion of human body and has good cycle stability.