Effect of carboxylate fillers on mechanical， conductive， and sensing performance of PVA/CNF hydrogel

doi:10.19491/j.issn.1001-9278.2022.06.004

Abstract

Abstract:

In this work， carboxylate carbon nanotubes （CNTs） and cellulose nanocrystals （CNC） were used to induce a dense crosslinking structure and act as reinforcement agents in poly（vinyl alcohol）（PVA）/cellulose nanofibers composite hydrogels. The results indicated that the tensile strength of the composite hydrogels increased from 50 kPa to 120 kPa with the addition of 3 wt % CNTs， whereas， their tensile strength and elongation at break both increased with the addition of 3 wt % CNC. Meanwhile， the electrical resistance of the composite hydrogels decreased significantly in the presence of CNT due to the formation of a conductive percolation threshold and ionic conductive paths. Therefore， the composite hydrogel with 3 wt % CNT can be selected as a sensing material. The hydrogels designed in this study exhibit a rapid and accurate sensing response to various stresses in tension， compression and bending.

Key words: poly（vinyl alcohol）, hydrogel, sensor, ironic conductive, high strength

CLC Number:

TQ320

LIU Wei, WU Xian, CHEN Xiaocheng, CHENG Xiaoqiong, ZHANG Chun. Effect of carboxylate fillers on mechanical， conductive， and sensing performance of PVA/CNF hydrogel[J]. China Plastics, 2022, 36(6): 16-23.

Figures/Tables 9

Fig.1. Photos of different PVA hydrogels

Fig.2. SEM photos of different PVA hydrogels

Fig.3. Hydrogel photos and transmittance spectrums of different hydrogels

Fig.4. The water contact angle of PVA/CNF hydrogels with different CNT and CNC contents

Fig.5. The tensile stress?strain curves of PVA/CNF hydrogels with different CNT and CNC contents

Fig.6. 10?times cyclic compressive stress?strain curves of different PVA/CNF hydrogels

Fig.7. Photos of PVA/CNF hydrogels while lifting weight and being stretched

Fig.8. The relationship of electro resistance and soaking time

Fig.9. The stress response and real?time monitoring of human motions of the PVA/CNF?CNT3 hydrogel

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