Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 220, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2022.109263
Keywords
Flexible composites; Nano composites; Mechanical properties; Sensing; 3D printing
Categories
Funding
- National Natural Science Foundation of China [52122303, 21875033]
- Fundamental Research Funds for the Central Universities [2232020G-02]
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An intrinsically stretchable polyaniline hybrid hydrogel with high elasticity and large sensitivity has been prepared through a reactive shaping method. The hydrogel exhibits high fatigue resistance and can be used as a stretchable conductor for capacitive pressure sensors. The reactive shaping method also enables the printing of microstructures with high elasticity and dual-conducting pathways.
Conducting polymer hydrogels face difficulties in the combination of high elasticity, large sensitivity and wide response range for flexible pressure sensing. Herein, an intrinsically stretchable polyaniline hybrid hydrogel (PHH) is prepared through a reactive shaping method including two steps. First, a high-viscosity precursor solution containing poly(acrylic acid) (PAA), poly(ethylene oxide) (PEO) and aniline monomers is submerged into an acid solution containing initiators for the polymerization of aniline, and gelation is quickly formed due to the formation of dense hydrogen bonds between the PAA and PEO chains. Second, the initiators in the acid solution facilitate subsequent in-situ polymerization of aniline confined in the PAA/PEO framework into a 3D polyaniline (PANI) network. Benefiting from the formation of reversible hydrogen bonds and electrostatic interactions between the PAA/PEO and PANI networks, the resultant PHH exhibits large stretchability and high fatigue resistance. The reactive shaping method facilitates a 3D reactive printing of PHH into pre-designed microlattice structures with high elasticity and electron/ion dual-conducting pathways, which is promising as a stretchable conductor for capacitive pressure sensors. The sensors therefore display high sensitivity (7.10 kPa 1) in a wide detecting range and are capable of detecting complex human motions for wearable sensing applications.
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