Chitosan derivative-based double network hydrogels with high strength, high fracture toughness and tunable mechanics

Gan, Shuchun; Xu, Bo; Zhang, Xiong; Zhao, Jianhao; Rong, Jian

doi:10.1016/j.ijbiomac.2019.06.197

Cited by 23 publications

(13 citation statements)

References 40 publications

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“…Scanning electron microscopy showed that the Pp-hydrogel can be seen to have a certain pore structure. The closer the network structure of hydrogel is, the smaller the mesh size of hydrogel is, the better the mechanical properties of hydrogel are, and the energy dissipation of hydrogel is also beneficial …”

Section: Resultsmentioning

confidence: 99%

“…The closer the network structure of hydrogel is, the smaller the mesh size of hydrogel is, the better the mechanical properties of hydrogel are, and the energy dissipation of hydrogel is also beneficial. 49 It is well-known that β-phase PVDF-TrFE can produce a piezoelectric response, so it is necessary to determine the crystallization properties of Pp-hydrogels with different PVDF-TrFE contents. The XRD pattern (Figure 1d Through the analysis of XRD patterns (Figure 1d) and DSC curves (Figure 1e), it is found that the addition of PVDF-TrFE introduces its own crystal characteristics and does not affect the structure of the hydrogel skeleton.…”

Section: Structural Design and Preparation Strategy Ofmentioning

confidence: 99%

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Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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Conductive hydrogels have attracted attention because of their wide application in wearable devices. However, it is still a challenge to achieve conductive hydrogels with high sensitivity and wide frequency band response for smart wearable strain sensors. Here, we report a composite hydrogel with piezoresistive and piezoelectric sensing for flexible strain sensors. The composite hydrogel consists of cross-linked chitosan quaternary ammonium salt (CHACC) as the hydrogel matrix, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) as the conductive filler, and poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) as the piezoelectric filler. A one-pot thermoforming and solution exchange method was used to synthesize the CHACC/PEDOT: PSS/PVDF-TrFE hydrogel. The hydrogel-based strain sensor exhibits very high sensitivity (GF: 19.3), fast response (response time: 63.2 ms), and wide frequency range (response frequency: 5−25 Hz), while maintaining excellent mechanical properties (elongation at break up to 293%). It can be concluded that enhanced strain-sensing properties of the hydrogel are contributed to both greater change in the relative resistance under stress and wider response to dynamic and static stimulus by adding PVDF-TrFE. This has a broad application in monitoring human motion, detecting subtle movements, and identifying object contours and a hydrogel-based array sensor. This work provides an insight into the design of composite hydrogels based on piezoelectric and piezoresistive sensing with applications for wearable sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Structural Design and Preparation Strategy Ofmentioning

confidence: 99%

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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“…fabricated a physically crosslinked poly(vinyl alcohol)‐ (2‐hydroxypropyltrimethyl ammonium chloride chitosan) (PVA‐ HACC) microcrystalline‐ionic DN hydrogel via freezing‐thawing technique and soaking strategy. [ 80 ] The fully physically crosslinked structure rendered the hydrogel eminent self‐recovered property and anti‐fatigue performance. Due to the green fabrication process without organic solvents or toxic crosslinkers, the obtained hydrogel possessed good cytocompatibility and outstanding environmental friendliness.…”

Section: Chitosan Physical Network Based Tough Hydrogelsmentioning

confidence: 99%

Energy‐Dissipative and Soften Resistant Hydrogels Based on Chitosan Physical Network: From Construction to Application

Yang

2022

Chin. J. Chem.

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In spite of biological tissue-like peculiarity, multifarious functionalities and great application prospect, the low mechanics and soften behavior of hydrogels still retain a problem to be addressed for repetitive weight-bearing fields of flexible electronics, actuators, substitutions of soft tissues, wound dressing, wearable or implantable devices. Due to the distinct combination of diversity, reversibility and impressive disruption-reconstruction capacity, the chitosan physical cross-links can server as recoverable "sacrificial bonds" to construct multifarious energy-dissipative and anti-soften hydrogels and further broaden their diversified applications. In this review, we summarized the gelation mechanisms of chitosan physical networks and highlighted the chitosan physical network based hydrogels in rational design, construction principle, and structure and performance regulation. The recent progress in functional hydrogels for flexible electronics and biomaterials was systematically discussed. Overall, the review will provide comprehensive guidelines on the design principle, performance modulation and functionality construction of energy-dissipative and soften resistant hydrogels.

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“…In comparison, physically cross-linked hydrogels constructed by non-covalent interactions can be restored after deformation, and therefore have better tensile properties and self-healing ability. [34,35] In recent studies on hydrogel sensors, single-network hydrogels typically exhibit unsatisfactory mechanical properties, [36] while good rigidity and toughness have been achieved by the DN hydrogels obtained by cross-linking of hard and brittle polyelectrolyte networks and soft neutral polymerization. Moreover, DN hydrogels have been proven to improve the sensing performance and mechanical properties of sensors simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Double Network Hydrogel Sensors with High Sensitivity in Large Strain Range

Zhang

Wang

Dai

et al. 2021

Macro Materials & Eng

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Owing to their preferable flexibility and facilitation to integrate with various apparel products, flexible sensors with high sensitivity are highly favored in the fields of environmental monitoring, health diagnosis, and wearable electronics. However, great challenges still remain in integrating high sensitivity with wide sensing range in one single flexible strain sensor. Herein, a new stretchable conductive gel-based sensor exhibiting remarkable properties regarding stretchability and sensitivity is developed via improving the ionic conductivity of the PVA/P(AM-AANa) double network hydrogel. Specifically, the strain sensor developed exhibits an excellent elongation of 549%, good fatigue resistance, and recovery performance. Simultaneously, the hydrogel strain sensor shows a high conductivity of 25 mS cm −1 , fast response time of 360 ms, and a linear response (gauge factor = 4.75) to external strain (≈400%), which endow the sensor with accurate and reliable capacities to detect various human movements. Integrating the merits of flexibility, environment friendliness, and high sensitivity, the conductive gel-based sensor has promising application prospects in human-machine interfaces, touchpads, biosensors, electronic skin, wearable electronic devices, and so on.

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Chitosan derivative-based double network hydrogels with high strength, high fracture toughness and tunable mechanics

Cited by 23 publications

References 40 publications

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Energy‐Dissipative and Soften Resistant Hydrogels Based on Chitosan Physical Network: From Construction to Application

Double Network Hydrogel Sensors with High Sensitivity in Large Strain Range

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