Simple and environmentally friendly approach for preparing high-performance polyimide precursor hydrogel with fully aromatic structures for strain sensor

Zhou, Haoran; Zheng, Shuai; Qu, Chengtun; Wang, Dezhi; Liu, Changwei; Wang, Yiying; Fan, Xiaodong; Xiao, Wanbao; Li, Hongfeng; Zhao, Daoxiang; Chang, Jiaying; Chen, Chunhai; Zhao, Xiaogang

doi:10.1016/j.eurpolymj.2019.01.043

Cited by 15 publications

(8 citation statements)

References 49 publications

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“…The sensor exhibited good stability without any degradation during continuous stretching and releasing tests for 300 cycles at strains of 20% (Figure S18) and 50% (Figure h), indicating excellent reproducibility and durability. Figure i shows that the hydrogel strain sensor had not only a wide range of detection strain but also a high gauge factor compared to those of other reported hydrogel strain sensors. ,,− …”

Section: Resultsmentioning

confidence: 84%

Bioinspired Dynamic Cross-Linking Hydrogel Sensors with Skin-like Strain and Pressure Sensing Behaviors

et al. 2019

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Biomimetic skin-like electric materials have been rapidly developed for human–machine interfaces, health monitoring, and soft robots. However, achieving a combination of mechanical and sensory properties like those of human skin remains a challenge. Here, a bioinspired physical cross-linking hydrogel sensor is designed and fabricated on the basis of an ionic conductive hydrogel with hybrid latex particles in a physically cross-linked network. The hydrogels exhibit excellent mechanical adaptability similar to that of human skin, including a low modulus, excellent stretchability, robust elasticity, rapid self-recoverability, and a good antifatigue property. Moreover, the addition of LiCl gives the hydrogel ideal ionic conducive behavior as a high-performance wearable sensor. The hydrogel-based sensor exhibits high sensitivity (GF = 5.44) over a broad strain window (0.25–2000%), excellent pressure sensing capability, a rapid response time, negligible hysteresis, and good durability. As a result, the hydrogel sensor can monitor various human motions, including large-scale joint bending, running and jumping, and tiny phonating and breathing. Therefore, the strategy will broaden the path for the new generation of biomimetic sensors with skin-like mechanical and strain and pressure sensing performances.

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Section: Resultsmentioning

confidence: 84%

Bioinspired Dynamic Cross-Linking Hydrogel Sensors with Skin-like Strain and Pressure Sensing Behaviors

et al. 2019

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“…In summary, wearable flexible sensors [ 83 , 84 , 85 ] for human health monitoring [ 86 , 87 , 88 , 89 , 90 ] have shown new advances. These flexible sensors can better monitor subtle changes in the external environment, such as temperature [ 91 , 92 , 93 ], humidity [ 91 , 94 ], and deformation [ 95 , 96 ], and are evolving rather fast. For these kinds of sensors, various types of hydrogels are being actively developed, such as cellulose hydrogels [ 97 ], PNIPAM hydrogels [ 98 ], and double chain hydrogels [ 99 ].…”

Section: Numerical Resultsmentioning

confidence: 99%

Modeling Tunable Fracture in Hydrogel Shell Structures for Biomedical Applications

Zhang

Qiu

Elkhodary

et al. 2022

Gels

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Hydrogels are nowadays widely used in various biomedical applications, and show great potential for the making of devices such as biosensors, drug- delivery vectors, carriers, or matrices for cell cultures in tissue engineering, etc. In these applications, due to the irregular complex surface of the human body or its organs/structures, the devices are often designed with a small thickness, and are required to be flexible when attached to biological surfaces. The devices will deform as driven by human motion and under external loading. In terms of mechanical modeling, most of these devices can be abstracted as shells. In this paper, we propose a mixed graph-finite element method (FEM) phase field approach to model the fracture of curved shells composed of hydrogels, for biomedical applications. We present herein examples for the fracture of a wearable biosensor, a membrane-coated drug, and a matrix for a cell culture, each made of a hydrogel. Used in combination with experimental material testing, our method opens a new pathway to the efficient modeling of fracture in biomedical devices with surfaces of arbitrary curvature, helping in the design of devices with tunable fracture properties.

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“…This enabled liquid extrusion based on 3D printing. 42,43 The synthesized water-based polyimide showed excellent mechanical strength and high thermal stability, which guaranteed excellent performance of the resultant 3D printed structures. The capabilities of printing complex shaped struts arrayed in the form of triangles, squares, and hexagonal honeycombs, were exploited.…”

Section: ■ Introductionmentioning

confidence: 97%

“…Compared to the conventional poly(amic acid) (PAA) solutions synthesized using DMAc or NMP solvents, the as-fabricated high molecular weight PAAS hydrogel showed excellent thermosensitivity and self-healing properties. This enabled liquid extrusion based on 3D printing. , The synthesized water-based polyimide showed excellent mechanical strength and high thermal stability, which guaranteed excellent performance of the resultant 3D printed structures. The capabilities of printing complex shaped struts arrayed in the form of triangles, squares, and hexagonal honeycombs, were exploited.…”

Section: Introductionmentioning

confidence: 99%

3D Printing of Lightweight Polyimide Honeycombs with the High Specific Strength and Temperature Resistance

Wang

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

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Lightweight structures are often used for applications requiring higher strength-to-weight ratios and lower densities, such as in aircraft, vehicles, and various engine components. Three-dimensional (3D) printing technology has been widely used for lightweight polymer structures because of the superior flexibility, personalized design, and ease of operation offered by it. However, synthesis of lightweight polymeric structures that possess both high specific strength and glass transfer temperature (T g ) remains an elusive goal, because 3D printed polymers with these properties are still very few in the market. For example, 3,3′,4,4'-biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA)-type (UPILEX-S type) polyimides show exceptional thermal stability (T g up to ≈400 °C) and mechanical properties (tensile strength exceeding 500 MPa) and are the first choice if extremely high temperatures of 400 °C or even higher (depending on the duration) are required, which hampers their processing using existing 3D printing techniques. However, their processing using existing 3D printing techniques is hampered due to their thermal resistance. Herein, a 3D printing approach was demonstrated for generating complex lightweight BPDA-PDA polyimide geometries with unprecedented specific strength and thermal resistance. The simple aqueous polymerization reaction of BPDA with water-soluble PDA and triethylamine (TEA) afforded the poly(amic acid) ammonium salt (PAAS) hydrogels. These PAAS solutions showed clear shear thinning and thermo-reversibility, along with high G′ gel-state moduli, which ensured selfsupporting features and shape fidelity in the gel state. Postprinting thermal treatment transformed the PAAS precursor to BPDA− PDA polyimide (UPILEX-S type). The resulting layer-by-layer deposition onto lightweight polyimide honeycombs in the form of triangular, square, and hexagonal structures showed tailorable mechanical strength, exceptional compressive strength-to-weight ratio (highest up to 0.127 MPa (kg m −3 ) −1 ), and remarkable thermoresistance (T g approximately 380 °C). These high-performance 3D printed polyimide honeycombs and unique synthetic techniques with general structures are potentially useful in fields ranging from automotive to aerospace technologies.

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Simple and environmentally friendly approach for preparing high-performance polyimide precursor hydrogel with fully aromatic structures for strain sensor

Cited by 15 publications

References 49 publications

Bioinspired Dynamic Cross-Linking Hydrogel Sensors with Skin-like Strain and Pressure Sensing Behaviors

Bioinspired Dynamic Cross-Linking Hydrogel Sensors with Skin-like Strain and Pressure Sensing Behaviors

Modeling Tunable Fracture in Hydrogel Shell Structures for Biomedical Applications

3D Printing of Lightweight Polyimide Honeycombs with the High Specific Strength and Temperature Resistance

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