Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 155, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2022.106813
Keywords
Polymer-matrix composites (PMCs); Electrical properties; Electron microscopy; Surface treatments
Funding
- Research Funds for the Central Universities [21619102]
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In this study, a freezing-tolerant hydrogel with high stretchability, strength, and ionic conductivity was successfully prepared. The hydrogel-based organic sensor exhibited excellent performance in strain monitoring. Therefore, this research holds promising potential for applications in wearable devices.
Ionic conductive hydrogels with advantageous mechanical properties and high stretchability attract much attentions in wearable electronic devices. Here, a freezing-tolerant hydrogel with high stretchability (435%), strength (2.0 MPa), and ionic conductivity had been prepared by freezing/thawing of polyvinyl alcohol (PVA) and polyethylene glycol functionalized chitin nanocrystals (PEG-g-ChNCs) in dimethyl sulfoxide-water solvent. The successful grafting of PEG on ChNCs was confirmed by various characterization methods. The organohydrogel reinforced by PEG-g-ChNCs displayed excellent freezing-tolerance without rupture during extension, which remains conductivity (0.01 S/m) even at -20 degrees C. PVA/PEG-g-ChNCs organohydrogel was employed as strain sensor. Interestingly, the sensors based on this organohydrogel presented high stretching sensitivity with a gauge factor of 2.3, and it could be repeatedly and stably monitor tiny strain under extension and pressure. Therefore, the ionic conductive organohydrogel sensor based PEG-g-ChNCs enhanced PVA have promising applications in wearable devices, such as sports monitoring or healthcare monitoring.
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