Tetradic double-network physical crosslinking hydrogels with synergistic high stretchable, self-healing, adhesive, and strain-sensitive properties

2021 ◽  
Author(s):  
Huihui Bai ◽  
Zhixing Zhang ◽  
Yajie Huo ◽  
Yongtao Shen ◽  
Mengmeng Qin ◽  
...  
Keyword(s):  
Self Healing ◽  
Double Network ◽  
Physical Crosslinking

Double-network hydrogels with superior self-healing properties using starch reinforcing strategy

2021 ◽  
Vol 257 ◽  
pp. 117626
Author(s):  
Xiaoqin Shang ◽  
Qingling Wang ◽  
Jinghao Li ◽  
Guojie Zhang ◽  
Jianguo Zhang ◽  
...  
Keyword(s):  
Self Healing ◽  
Double Network

Preparation and characterization of double network hydrogel with high-strength and self-healing

2021 ◽  
pp. 102450
Author(s):  
Shubin Li ◽  
Xiao Wang ◽  
Jiang Zhu ◽  
Zhenyu Wang ◽  
Lu Wang
Keyword(s):  
High Strength ◽  
Self Healing ◽  
Double Network

Effects of surfactant and ionic concentration on properties of dual physical crosslinking self-healing hydrogels by hydrophobic association and ionic interactions

2020 ◽  
Vol 44 (10) ◽  
pp. 4061-4070 ◽  
Author(s):  
Yayu Li ◽  
Tianyang Zhou ◽  
Zhangyong Yu ◽  
Fei Wang ◽  
Dongjian Shi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ionic Concentration ◽  
Hydrophobic Association ◽  
Ionic Interactions ◽  
Self Healing ◽  
Physical Crosslinking

Two kinds of dual crosslinking hydrogels have adjustable mechanical properties, self-healing and self-recovery performances.

scholarly journals Soot removal from ancient Egyptian complex painted surfaces using a double network gel: Empirical tests on the ceiling of the sanctuary of Osiris in the temple of Seti I – Abydos

2020 ◽  
Author(s):  
Ehab Awad Al-Emam ◽  
Abdel Ghafour Motawea ◽  
Joost Caen ◽  
Koen Janssens
Keyword(s):  
Self Healing ◽  
Wall Paintings ◽  
Shape Stability ◽  
Double Network ◽  
Ancient Egyptian ◽  
Third Phase ◽  
Digital Microscope ◽  
Seti I ◽  
The Temple

Abstract In this study, we evaluated the ease of removal of soot layers from ancient wall paintings by employing double network gels as a controllable cleaning method. The ceiling of the temple of Seti I (Abydos, Egypt) is covered with thick layers of soot; this is especially the case in the sanctuary of Osiris. These layers may have been accumulated during the occupation of the temple by Christians, fleeing the Romans in the first centuries A.D.. Soot particulates are one of the most common deposits to be removed during conservation-restoration activities of (Egyptian) wall paintings. They usually mask the painted reliefs and reduce the permeability of the painted surface. A Polyvinyl alcohol-borax/agarose (PVA-B/AG) double network gel was selected for this task since its properties were expected to be compatible with the cleaning treatment requirements. The gel is characterized by its flexibility, permitting to take the shape of the reliefs, while also having self-healing properties, featuring shape stability and an appropriate capacity to retain liquid. The gel was loaded with several cleaning reagents that proved to be effective for soot removal. Two sets of soot removal tests were conducted with these gel composites. The cleaned surfaces were examined in situ with the naked eye and with a digital microscope in order to select the best gel composite. The gel composite, loaded with a solution of 5% ammonia, 0.3% ammonium carbonate, and 0.3% EDTA yielded the most satisfactory results and allowed to safely remove a crust of thick soot particles from the surface. Thus, during a third phase of the study, it was used successfully to clean a larger area of the ceiling.

scholarly journals Characterization of polyvinyl alcohol-borax/agarose (PVA-B/AG) double network hydrogel utilized for the cleaning of works of art

2020 ◽  
Author(s):  
Ehab Awad Al-Emam ◽  
Hilde Soenen ◽  
Joost Caen ◽  
Koen Janssens
Keyword(s):  
Polyvinyl Alcohol ◽  
Self Healing ◽  
Retention Capacity ◽  
Structured Surfaces ◽  
Double Network ◽  
Liquid Retention ◽  
Long Time ◽  
Cleaning Procedures ◽  
Phase Retention

Abstract Since cleaning of artworks may cause undesirable physicochemical alterations and is a nonreversible procedure, it is mandatory to adopt the proper cleaning procedure. Such a procedure should remove undesired materials whilst preserving the original surface. In this regard, numerous gels have been developed and exploited for the cleaning of various artwork surfaces. Lately, agarose (AG) and polyvinyl alcohol-borax (PVA-B) hydrogels have been widely employed as cleaning tools by conservators. Both hydrogels show some limitations in specific cleaning practices. In this work, we investigated the influence of including increased levels of agarose into PVA-B systems. For this reason, we performed a detailed characterization on the double network (DN) hydrogel including the chemical structure, the liquid phase retention, the rheological behavior, and the self-healing behavior of various PVA-B/AG double network hydrogels. These new hydrogels revealed better properties than PVA-B hydrogels and obviated their limitations. The inclusion of AG into PVA-B systems enhanced the liquid retention capacity, shape-stability, and mechanical strength of the blend. Furthermore, AG minimized the expelling/syneresis issue that occurs when loading PVA-B systems with low polarity solvents or chelating agents. The resultant double network hydrogel exhibits relevant self-healing properties. The PVA-B/AG double network is a new and useful cleaning tool that can be added to the conservators’ tool-kit. It is ideal for cleaning procedures dealing with porous and complex structured surfaces, vertical surfaces and for long time applications.

Polysaccharide-based recoverable double-network hydrogel with high strength and self-healing properties

2020 ◽  
Vol 8 (4) ◽  
pp. 794-802 ◽  
Author(s):  
Kun Lei ◽  
Zhao Li ◽  
Dandan Zhu ◽  
Chengyuan Sun ◽  
Yunlong Sun ◽  
...  
Keyword(s):  
High Strength ◽  
Self Healing ◽  
Double Network ◽  
Significant Attention

Polysaccharide-based hydrogels (PSBHs) have received significant attention for numerous bio-applications due to their biocompatibility and non-immunogenic performance.

Self-healing, stretchable, and freezing-resistant hydroxypropyl starch-based double-network hydrogels

2021 ◽  
Vol 251 ◽  
pp. 116982
Author(s):  
Qianzhu Lin ◽  
Hao Li ◽  
Na Ji ◽  
Lei Dai ◽  
Liu Xiong ◽  
...  
Keyword(s):  
Self Healing ◽  
Double Network ◽  
Hydroxypropyl Starch

scholarly journals A Robust, Tough and Multifunctional Polyurethane/Tannic Acid Hydrogel Fabricated by Physical-Chemical Dual Crosslinking

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 239 ◽  
Author(s):  
Jie Wen ◽  
Xiaopeng Zhang ◽  
Mingwang Pan ◽  
Jinfeng Yuan ◽  
Zhanyu Jia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Polyethylene Glycol ◽  
Hydrogen Bonds ◽  
Tannic Acid ◽  
Hydroxyl Groups ◽  
Self Healing ◽  
Physical Chemical ◽  
Biomedical Field ◽  
Physical Crosslinking

Commonly synthetic polyethylene glycol polyurethane (PEG–PU) hydrogels possess poor mechanical properties, such as robustness and toughness, which limits their load-bearing application. Hence, it remains a challenge to prepare PEG–PU hydrogels with excellent mechanical properties. Herein, a novel double-crosslinked (DC) PEG–PU hydrogel was fabricated by combining chemical with physical crosslinking, where trimethylolpropane (TMP) was used as the first chemical crosslinker and polyphenol compound tannic acid (TA) was introduced into the single crosslinked PU network by simple immersion process. The second physical crosslinking was formed by numerous hydrogen bonds between urethane groups of PU and phenol hydroxyl groups in TA, which can endow PEG–PU hydrogel with good mechanical properties, self-recovery and a self-healing capability. The research results indicated that as little as a 30 mg·mL−1 TA solution enhanced the tensile strength and fracture energy of PEG–PU hydrogel from 0.27 to 2.2 MPa, 2.0 to 9.6 KJ·m−2, respectively. Moreover, the DC PEG–PU hydrogel possessed good adhesiveness to diverse substrates because of TA abundant catechol groups. This work shows a simple and versatile method to prepare a multifunctional DC single network PEG–PU hydrogel with excellent mechanical properties, and is expected to facilitate developments in the biomedical field.

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