An ultra-low hysteresis, self-healing and stretchable conductor based on dynamic disulfide covalent adaptable networks

Journal of Materials Chemistry A ◽

10.1039/d1ta08737a ◽

2022 ◽

Author(s):

weibo kong ◽

Yunyun Yang ◽

Yanjun Wang ◽

Hongfei Cheng ◽

Peiyao Yan ◽

...

Keyword(s):

Mechanical Properties ◽

Health Monitoring ◽

Self Healing ◽

Soft Robots ◽

Stretchable Conductor

Stretchable self-healing conductors can autonomously restore their electrical and mechanical properties after experiencing damage, thus being valuable in the application of prostheses, soft robots, and health monitoring. Currently, most reported...

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Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

Polymer Chemistry ◽

10.1039/d0py01034k ◽

2020 ◽

Vol 11 (41) ◽

pp. 6549-6558

Author(s):

Yohei Miwa ◽

Mayu Yamada ◽

Yu Shinke ◽

Shoichi Kutsumizu

Keyword(s):

Mechanical Properties ◽

Room Temperature ◽

Self Healing ◽

High Modulus ◽

Disordered Crystals ◽

Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

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Polypyrrole/PU hybrid hydrogels: electrically conductive and fast self-healing for the potential application in body-monitor sensor

New Journal of Chemistry ◽

10.1039/d1nj00616a ◽

2021 ◽

Author(s):

Zhanyu Jia ◽

Guangyao Li ◽

Juan Wang ◽

shouhua Su ◽

Jie Wen ◽

...

Keyword(s):

Mechanical Properties ◽

Electrical Conductivity ◽

Potential Application ◽

Self Healing ◽

Electrically Conductive ◽

Sensor Application ◽

Hybrid Hydrogels ◽

Health Monitor

Conductivity, self-healing and moderate mechanical properties are necessary for multifunctional hydrogels which have great potential in health-monitor sensor application. However, the combination of electrical conductivity, self-healing and good mechanical properties...

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Self-healing, Highly Elastic and Amphiphilic Silicone-based Polyurethane for Antifouling Coatings

Journal of Materials Chemistry B ◽

10.1039/d0tb02465a ◽

2021 ◽

Author(s):

Xiaobin Lin ◽

Qingyi Xie ◽

Chunfeng Ma ◽

Guangzhao Zhang

Keyword(s):

Mechanical Properties ◽

Silicone Elastomer ◽

Self Healing ◽

Fouling Resistance ◽

The Poor ◽

Antifouling Coatings ◽

Fouling Release

Silicone elastomer coatings have attracted increasing attention owing to its eco-friendly nature, excellent fouling release ability and drag-reducing property. However, the poor mechanical properties and lack of fouling resistance limits...

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The preparation of hydrogels with highly efficient self-healing and excellent mechanical properties

Journal of Molecular Liquids ◽

10.1016/j.molliq.2021.115581 ◽

2021 ◽

Vol 329 ◽

pp. 115581

Author(s):

Chaoxian Chen ◽

Zhongcun Li ◽

Siwen Chen ◽

Lingzhi Kong ◽

Zhihao Guo ◽

...

Keyword(s):

Mechanical Properties ◽

Self Healing ◽

Highly Efficient

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The Effect of Superabsorbent Polymers on the Microstructure and Self-Healing Properties of Cementitious-Based Composite Materials

Applied Sciences ◽

10.3390/app11020700 ◽

2021 ◽

Vol 11 (2) ◽

pp. 700

Author(s):

Irene A. Kanellopoulou ◽

Ioannis A. Kartsonakis ◽

Costas A. Charitidis

Keyword(s):

Mechanical Properties ◽

Composite Materials ◽

Hybrid Structure ◽

The Self ◽

Self Healing ◽

Cementitious Composite ◽

Superabsorbent Polymers ◽

Porosity Reduction ◽

Environment Control ◽

The Impact

Cementitious structures have prevailed worldwide and are expected to exhibit further growth in the future. Nevertheless, cement cracking is an issue that needs to be addressed in order to enhance structure durability and sustainability especially when exposed to aggressive environments. The purpose of this work was to examine the impact of the Superabsorbent Polymers (SAPs) incorporation into cementitious composite materials (mortars) with respect to their structure (hybrid structure consisting of organic core—inorganic shell) and evaluate the microstructure and self-healing properties of the obtained mortars. The applied SAPs were tailored to maintain their functionality in the cementitious environment. Control and mortar/SAPs specimens with two different SAPs concentrations (1 and 2% bwoc) were molded and their mechanical properties were determined according to EN 196-1, while their microstructure and self-healing behavior were evaluated via microCT. Compressive strength, a key property for mortars, which often degrades with SAPs incorporation, in this work, practically remained intact for all specimens. This is coherent with the porosity reduction and the narrower range of pore size distribution for the mortar/SAPs specimens as determined via microCT. Moreover, the self-healing behavior of mortar-SAPs specimens was enhanced up to 60% compared to control specimens. Conclusively, the overall SAPs functionality in cementitious-based materials was optimized.

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Structural Health Monitoring of 2D Plane Structures

Applied Sciences ◽

10.3390/app11052000 ◽

2021 ◽

Vol 11 (5) ◽

pp. 2000

Author(s):

Behnam Mobaraki ◽

Haiying Ma ◽

Jose Antonio Lozano Galant ◽

Jose Turmo

Keyword(s):

Mechanical Properties ◽

Health Monitoring ◽

Mathematical Analysis ◽

Stiffness Matrix ◽

State Of The Art ◽

System Of Equations ◽

Matrix System ◽

Structural System ◽

Detailed Mathematical Analysis ◽

Structural System Identification

This paper presents the application of the observability technique for the structural system identification of 2D models. Unlike previous applications of this method, unknown variables appear both in the numerator and the denominator of the stiffness matrix system, making the problem non-linear and impossible to solve. To fill this gap, new changes in variables are proposed to linearize the system of equations. In addition, to illustrate the application of the proposed procedure into the observability method, a detailed mathematical analysis is presented. Finally, to validate the applicability of the method, the mechanical properties of a state-of-the-art plate are numerically determined.

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Recyclable Self-Healing Polyurethane Cross-Linked by Alkyl Diselenide with Enhanced Mechanical Properties

Polymers ◽

10.3390/polym11050773 ◽

2019 ◽

Vol 11 (5) ◽

pp. 773 ◽

Cited By ~ 3

Author(s):

Yuqing Qian ◽

Xiaowei An ◽

Xiaofei Huang ◽

Xiangqiang Pan ◽

Jian Zhu ◽

...

Keyword(s):

Mechanical Properties ◽

Room Temperature ◽

Amide Bond ◽

Self Healing ◽

Healing Efficiency ◽

Polyurethane Networks ◽

Combined Action ◽

Cross Linker ◽

Dynamic Structures ◽

External Interventions

Dynamic structures containing polymers can behave as thermosets at room temperature while maintaining good mechanical properties, showing good reprocessability, repairability, and recyclability. In this work, alkyl diselenide is effectively used as a dynamic cross-linker for the design of self-healing poly(urea–urethane) elastomers, which show quantitative healing efficiency at room temperature, without the need for any catalysts or external interventions. Due to the combined action of the urea bond and amide bond, the material has better mechanical properties. We also compared the self-healing effect of alkyl diselenide-based polyurethanes and alkyl disulfide-based polyurethanes. The alkyl diselenide has been incorporated into polyurethane networks using a para-substituted amine diphenyl alkyl diselenide. The resulting materials not only exhibit faster self-healing properties than the corresponding disulfide-based materials, but also show the ability to be processed at temperatures as low as 60 °C.

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Numerical Studies of the Effects of Water Capsules on Self-Healing Efficiency and Mechanical Properties in Cementitious Materials

Advances in Materials Science and Engineering ◽

10.1155/2016/8271214 ◽

2016 ◽

Vol 2016 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Haoliang Huang ◽

Guang Ye

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Elastic Modulus ◽

Cementitious Materials ◽

Self Healing ◽

Negative Effects ◽

Numerical Studies ◽

Healing Efficiency ◽

The Impact ◽

Positive Effect

In this research, self-healing due to further hydration of unhydrated cement particles is taken as an example for investigating the effects of capsules on the self-healing efficiency and mechanical properties of cementitious materials. The efficiency of supply of water by using capsules as a function of capsule dosages and sizes was determined numerically. By knowing the amount of water supplied via capsules, the efficiency of self-healing due to further hydration of unhydrated cement was quantified. In addition, the impact of capsules on mechanical properties was investigated numerically. The amount of released water increases with the dosage of capsules at different slops as the size of capsules varies. Concerning the best efficiency of self-healing, the optimizing size of capsules is 6.5 mm for capsule dosages of 3%, 5%, and 7%, respectively. Both elastic modulus and tensile strength of cementitious materials decrease with the increase of capsule. The decreasing tendency of tensile strength is larger than that of elastic modulus. However, it was found that the increase of positive effect (the capacity of inducing self-healing) of capsules is larger than that of negative effects (decreasing mechanical properties) when the dosage of capsules increases.

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