pH-Responsive polyethyleneimine hydrogel based on dynamic covalent bonds

Yang, Jingyu; Zhu, Zhuoyan; Zhang, Jinzhi; Chen, Chuhao; Lei, Zhengyu; Li, Lingyu; Zhao, Feng; Su, Xin

doi:10.1007/s10965-023-03479-y

Cited by 5 publications

(5 citation statements)

References 35 publications

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“…However, the G′ and G″ gradually approached each other when the frequency tends to be lower, indicating that the hydrogel had a certain tendency to be fluid at low frequencies. In addition, the G′ of PVA‐PANa‐B increased with the addition of sodium phytate, which was due to the formation of abundant hydrogen bonds between sodium phytate and polyvinyl alcohol; the G″ of PVA‐PANa‐B also increased, which was due to the decrease of pH, the stronger dynamic reversibility of borate ester bonds, [ 49,50 ] and the better energy dissipation ability of the hydrogel. The dynamic reversible crosslinking of PVA‐PANa‐B hydrogels was further evaluated by a dynamic strain scan test.…”

Section: Resultsmentioning

confidence: 99%

Self‐Healable, Self‐Adhesive Conductive Hydrogels Based on Integrated Multiple Interactions for Wearable Sensing

Lu,

Li,

et al. 2023

Macro Chemistry & Physics

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With the development of the medical and health industry, new health monitoring devices have attracted a lot of attention. By placing sensors in different organs, intelligent detection of human behavior and diagnosis of physical health can be achieved. Traditional electronic sensor devices have huge deficiencies in capturing tiny stimulus signals and comfort. Wearable sensors based on flexible conductive hydrogels are the most promising candidates for conventional sensors. However, developing conductive hydrogel sensors with good self‐healing and adhesion properties is still a challenge. However, the development of conductive hydrogels with good self‐healing and adhesion properties is still a challenge. Herein, we prepared a flexible polyvinyl alcohol hydrogel (PVA‐PANa‐B) with good self‐healing properties, self‐adhesive and conductive properties based on polyvinyl alcohol, sodium phytate solution and borax using a simple method. The abundant hydrogen bonding interactions, dynamically reversible borate ester bonds in the hydrogel network endowed the hydrogel with good self‐healing properties, self‐adhesion and electrical conductivity. The fractured hydrogels showed almost disappearance of cracks after 30 min of self‐healing, and the efficiency of electrochemical repair within 0.1 s was close to 100%. The hydrogels can achieve good adhesion to different substrates. PVA‐PANa‐B can be used as flexible writable circuits and smart wearable sensors, which have promising applications in the fields of flexible electronics, smart sensing and health monitoring.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Self‐Healable, Self‐Adhesive Conductive Hydrogels Based on Integrated Multiple Interactions for Wearable Sensing

Lu,

Li,

et al. 2023

Macro Chemistry & Physics

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“…Monomers with active functional groups or crosslinking agents with active end groups undergo free radical polymerization to form irreversible chemical crosslinking reactions, resulting in water-soluble hydrogel matrices used as polymer substrates for photothermal conversion materials. There are two main methods for chemically crosslinking biomaterial hydrogels: the first involves chain polymerization of hydrophilic monomers or stepwise polymerization of multifunctional compounds, while the second involves appropriate modification and functionalization of existing polymers, mainly using high-molecular-weight precur- sors with reactive groups such as polyvinyl alcohol, [95][96] polyacrylic acid, [97] polyethylene imine, [98] and starch. [99] These polymers must contain certain active groups, such as amino, carboxyl, and hydroxyl groups.…”

Section: Chemical Crosslinkingmentioning

confidence: 99%

Photothermal Conversion of Hydrogel‐Based Biomaterial

Wei

et al. 2023

The Chemical Record

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Traditional energy from fossil fuels like petroleum and coal is limited and contributes to global environmental pollution and climate change. Developing sustainable and eco‐friendly energy is crucial for addressing significant challenges such as climate change, energy dilemma and achieving the long‐term development of human society. Biomass hydrogels, which are easily synthesized and modified, have diverse sources and can be designed for different applications. They are being extensively researched for their applications in artificial intelligence, flexible sensing, biomedicine, and food packaging. The article summarizes recent advances in the preparation and applications of biomass‐based photothermal conversion hydrogels, discussing the light source, photothermal agents, matrix, and preparation methods in detail. It also explores the use of these hydrogels in seawater desalination, photothermal therapy, antibacterial agents, and light‐activated materials, offering new ideas for developing sustainable, efficient, and advanced photothermal conversion biomass hydrogel materials. The article concludes with suggestions for future research, highlighting the challenges and prospects in this field and paving the way for developing of long‐lasting, efficient energy materials.

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“…Stimuli-responsive hydrogels, also known as smart hydrogels, are materials that respond to stimuli in the external environment and undergo considerable changes in colour [ 1 , 2 , 3 ], volume [ 4 ] and mechanical properties [ 5 ]. According to different stimulus-response modes, they can be roughly divided into temperature-responsive hydrogels [ 6 ], electrical-responsive hydrogels [ 7 ], light-responsive hydrogels [ 8 , 9 ], magnetic-responsive hydrogels [ 10 , 11 , 12 ] and chemical-responsive hydrogels [ 13 , 14 ]. Because of these characteristics, they have various applications in intelligent switches [ 15 , 16 ], artificial muscles [ 17 , 18 ], soft robots [ 19 ], shape-memory materials and other fields [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

NIR-Mediated Deformation from a CNT-Based Bilayer Hydrogel

Long,

Liu,

Ren

et al. 2024

Polymers

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Shape-shifting polymers are widely used in various fields such as intelligent switches, soft robots and sensors, which require both multiple stimulus-response functions and qualified mechanical strength. In this study, a novel near-infrared-light (NIR)-responsible shape-shifting hydrogel system was designed and fabricated through embedding vinylsilane-modified carbon nanotubes (CNTs) into particle double-network (P-DN) hydrogels by micellar copolymerisation. The dispersed brittle Poly(sodium 2-acrylamido-2-methylpropane-1-sulfonate) (PNaAMPS) network of the microgels can serve as sacrificial bonds to toughen the hydrogels, and the CNTs endow it with NIR photothermal conversion ability. The results show that the CNTs embedded in the P-DN hydrogels present excellent mechanical strength, i.e., a fracture strength of 312 kPa and a fracture strain of 357%. Moreover, an asymmetric bilayer hydrogel, where the active layer contains CNTs, can achieve 0°–110° bending deformation within 10 min under NIR irradiation and can realise complex deformation movement. This study provides a theoretical and experimental basis for the design and manufacture of photoresponsive soft actuators.

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pH-Responsive polyethyleneimine hydrogel based on dynamic covalent bonds

Cited by 5 publications

References 35 publications

Self‐Healable, Self‐Adhesive Conductive Hydrogels Based on Integrated Multiple Interactions for Wearable Sensing

Self‐Healable, Self‐Adhesive Conductive Hydrogels Based on Integrated Multiple Interactions for Wearable Sensing

Photothermal Conversion of Hydrogel‐Based Biomaterial

NIR-Mediated Deformation from a CNT-Based Bilayer Hydrogel

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