高强度纤维素双网络导电水凝胶制备及其应变感应特性研究

doi:10.3969/j.issn.0253-2417.2023.03.004

Abstract

Abstract:

The primary network was formed by using ethanol vapor to induce the microcrystalline cellulose(MCC)-sodium hydroxide/urea solution. The acrylic acid(AA) and acrylamide(AM) were chosen as raw materials, together with N, N′-methylene bisacrylamide(MBAA) as a cross-linking agent, and ammonium persulfate(APS) as an initiator to fabricate the secondary network. Then, ferric chloride was introduced by soaking method to construct a multi-crosslinked cellulose/polyacrylamide-polyacrylic acid/ iron ion hydrogel(C/PAMAA/Fe³⁺). The mechanical and electrochemical properties of the hydrogel were investigated. The results showed that the coordination bond formed by Fe³⁺ and —COO^- acted as a sacrificial fracture during deformation, which contributed to the improvement of the mechanical properties of C/PAMAA/Fe³⁺. The hydrogel showed the toughness of 17.13 MJ/m³ and tensile strength of 4.59 MPa, respectively. Moreover, the results of the cyclic tensile loading-unloading test showed that the energy dissipation efficiency of the C/PAMAA/Fe³⁺ hydrogel increased with the increase of Fe³⁺ concentration, and the energy dissipation rate increased from 56.86% to 75.17%. Besides, the elastic recovery after the second cyclic loading-unloading could reach around 85.0%. As the increasing concentration of Fe³⁺, the ionic conductivity of the C/PAMAA/Fe³⁺ hydrogel increased, and a Fe³⁺ concentration of 0.2 mol/L was 1.03 S/m. The C/PAMAA/Fe³⁺ hydrogel was assembled as a strain sensor, and the sensitivity was 4.0. The resistance change results of the stretching increment and stretching cycle showed that the C/PAMAA/Fe³⁺ hydrogel strain sensor had good stability. The results of real-time monitoring of joint activities showed that the sensor had a stable strain response.

Key words: ion coordination, cellulose hydrogel, dual-network, strain sensor

CLC Number:

TQ35

Junyu JIAN, Yitong XIE, Shishuai GAO, Daihui ZHANG, Fuxiang CHU. Preparation and Strain Induction Characterization of High Strength Cellulose Dual-network Conductive Hydrogel[J]. Chemistry and Industry of Forest Products, 2023, 43(3): 25-33.

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References 21

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Fe³⁺/(mol·L^-1)	能量耗散/(MJ·m^-3)energy dissipation	韧性/(MJ·m^-3)toughness	能量耗散率/%energy dissipation rate
0.01	0.29	0.51	56.86
0.03	1.21	1.83	66.12
0.10	2.27	3.02	75.17

样品sample	韧性tenacity	参考文献ref.	样品sample	韧性tenacity	参考文献ref.
C/PAMAA/Fe³⁺-48 h	15.96	本研究this study	AMD-QCS^△	2.00	[14]
CBH^△	4.30	[4]	Cel₁₄/PAA-Fe_2.50³⁺^△	0.94	[15]
CMC-Fe³⁺/PAAm^△	6.52	[8]	PVA/PAANa(5)-Tb³⁺(0.5)*	0.93	[16]
PAM/CMC-Fe³⁺^△	5.23	[10]	κ-CG-K⁺/pHEAA*	11.90	[17]
poly(AA-co-SMA)/c-CNF/Fe³⁺^△	0.60	[11]	PAA-g-QCE1.5%/PVA8%*	2.60	[18]
PAA-CMC-Al³⁺^△	1.57	[12]	PAM-CS-A*	5.00	[19]
PAA/CMC_1.0-Fe³⁺-S^△	12.06	[13]	PAAm/PVA/CS/FeCl₃*	0.11	[20]

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Preparation and Strain Induction Characterization of High Strength Cellulose Dual-network Conductive Hydrogel

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