scholarly journals Sustainable High-Ductility Concrete with Rapid Self-Healing Characteristic by Adding Magnesium Oxide and Superabsorbent Polymer

2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Shuyin Wu ◽  
Guoyang Lu ◽  
Quan Liu ◽  
Pengfei Liu ◽  
Jun Yang
Keyword(s):  
Magnesium Oxide ◽  
Healing Time ◽  
The Self ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Superabsorbent Polymer ◽  
Self Healing ◽  
High Ductility ◽  
Healing Property ◽  
The Individual

As a class of high-ductility concrete, engineered cementitious composites (ECC) have wide application prospects in engineering fields. However, the occurrence of cracks and the limited self-healing ability hinder the development of ECC. Rapid self-healing has important significance for ECC in reducing maintenance costs and prolonging service life, which are conducive to sustainable development of ECC. Therefore, the aim of this paper is to enhance the self-healing property of ECC by adding light-burned magnesium oxide (MgO) and superabsorbent polymer (SAP) on the premise of maintaining the high ductility. First, the effect of MgO and SAP on the ductility property of ECC which is the most important feature was explored with the uniaxial tensile test. The results indicated that MgO is helpful to the strength but not conducive to the ductility of ECC, while SAP has an opposite effect. The effects of MgO and SAP on the ductility of ECC can be balanced. Later, the permeability test, scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used to evaluate the effects of MgO and SAP on the self-healing property of ECC. The results showed that the combined addition of MgO and SAP shows much better effect than the individual addition and can cut the healing time by half. Overall, it is concluded that ECC with MgO and SAP have the potential for self-healing, and the ductility can also be reconciled.

scholarly journals Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6431
Author(s):  
Peng Yang ◽  
Li-Qing Wang ◽  
Xu Gao ◽  
Sai Wang ◽  
Jun-Feng Su
Keyword(s):  
Healing Process ◽  
Healing Time ◽  
The Self ◽  
Asphalt Pavements ◽  
Self Healing ◽  
Microstructure Observation ◽  
Micro Cracks ◽  
Healing Efficiency ◽  
Healing Temperature ◽  
The Individual

It has become one of the research directions of intelligent materials for self-healing asphalt pavements to use a bionic microvascular containing oily rejuvenator. The rejuvenator in a microvascular can carry out the healing of asphalt micro-cracks, thus reducing the damage to and prolonging the life of asphalt pavement. The aim of this work was to investigate the smart self-healing capability of an asphalt/microvascular material through its microstructure and mechanical properties. Microstructure observation indicated no interface separation between the microvasculars and bitumen matrix. Micro-CT images showed that microvasculars dispersed in asphalt samples without accumulation or tangles. The phenomenon of microcracks healing without intervention was observed, which proved that the fractured asphalt sample carried out the self-healing process with the help of rejuvenator diffusing out from the broken microvasculars. The self-healing efficiency of asphalt samples was also evaluated through a tensile test considering the factors of microvasculars content, healing time and healing temperature. It was found that the tensile strength of the asphalt samples was greatly enhanced by the addition of microvasculars under a set test condition. Self-healing efficiency was enhanced with more broken microvasculars in the rupture interface of the asphalt sample. During two self-healing cycles, the self-healing efficiency of the asphalt sample with three microvascular per 1 cm2 of a broken interface were able to reach 80% and 86%. This proves that microvasculars containing rejuvenator play a practical role in the self-healing process of asphalt. With an increase in temperature from 0 to 30 °C, the self-healing capability of the asphalt samples increased dramatically. An increase in time increased the self-healing capability of the bitumen samples. At last, a preliminary mathematical model also deduced that the self-healing efficiency was determined by the individual healing steps, including release, penetration and diffusion of the rejuvenator agent.

scholarly journals Polar poly(n-butyl acrylate)-g-polyacrylonitrile elastomer with high temperature elasticity and healability as flexible electronic substrate

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Yuzhu Zheng ◽  
Deli Xu ◽  
Shiyou Tian ◽  
Manli Li ◽  
Wenwen Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Graft Copolymer ◽  
Butyl Acrylate ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Self Healing ◽  
Chemical Structures ◽  
Flexible Electronic ◽  
Ag Nanowires ◽  
Cyano Groups

AbstractIn this work, graft copolymer poly (n-butyl acrylate)-g-polyacrylonitrile with poly (n-butyl acrylate) as backbones and polyacrylonitrile as side chains (PnBA-g-PAN) was synthesized by macromonomer method and emulsion polymerization. The macromonomer was synthesized by atom transfer radical polymerization and end-group modification. The chemical structures and thermal properties of macromonomer and graft copolymer were investigated by FTIR, GPC, NMR and TGA, etc. The mechanical properties of graft copolymer elastomer was also measured by uniaxial tensile test. Rheological properties at different temperature and mechanical property demonstrated that graft copolymer elastomer possessed elasticity until 180 oC because of cyclization of cyano groups. Ag nanowires@PnBA-g-PAN composite elastomer was developed, and the resulted material exhibited autonomic healing property on account of segments’ flexibility and dynamic interaction between Ag nanowires (AgNWs) and cyano groups. This is a general method for generation of elastomer with high temperature elasticity and fast self-healing. The composite elastomer has potential application in flexible electronic conductor.

The self-healing property of silicone rubber after degraded by treeing

2012 ◽  
Author(s):  
K. Rudi ◽  
D. H Andrew ◽  
R. Managam ◽  
Zainuddin Nawawi ◽  
Naohiro Hozumi ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
The Self ◽  
Self Healing ◽  
Healing Property

scholarly journals Self-Healable Supramolecular Vanadium Pentoxide Reinforced Polydimethylsiloxane-Graft-Polyurethane Composites

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 41 ◽  
Author(s):  
Ali Berkem ◽  
Ahmet Capoglu ◽  
Turgut Nugay ◽  
Erol Sancaktar ◽  
Ilke Anac
Keyword(s):  
Tensile Strength ◽  
Vanadium Pentoxide ◽  
Coupling Reaction ◽  
Optical Microscope ◽  
Mechanical Tests ◽  
Healing Time ◽  
The Self ◽  
Supramolecular Polymer ◽  
Self Healing ◽  
Healing Efficiency

The self-healing ability can be imparted to the polymers by different mechanisms. In this study, self-healing polydimethylsiloxane-graft-polyurethane (PDMS-g-PUR)/Vanadium pentoxide (V2O5) nanofiber supramolecular polymer composites based on a reversible hydrogen bonding mechanism are prepared. V2O5 nanofibers are synthesized via colloidal route and characterized by XRD, SEM, EDX, and TEM techniques. In order to prepare PDMS-g-PUR, linear aliphatic PUR having one –COOH functional group (PUR-COOH) is synthesized and grafted onto aminopropyl functionalized PDMS by EDC/HCl coupling reaction. PUR-COOH and PDMS-g-PUR are characterized by 1H NMR, FTIR. PDMS-g-PUR/V2O5 nanofiber composites are prepared and characterized by DSC/TGA, FTIR, and tensile tests. The self-healing ability of PDMS-graft-PUR and composites are determined by mechanical tests and optical microscope. Tensile strength data obtained from mechanical tests show that healing efficiencies of PDMS-g-PUR increase with healing time and reach 85.4 ± 1.2 % after waiting 120 min at 50 °C. The addition of V2O5 nanofibers enhances the mechanical properties and healing efficiency of the PDMS-g-PUR. An increase of healing efficiency and max tensile strength from 85.4 ± 1.2% to 95.3 ± 0.4% and 113.08 ± 5.24 kPa to 1443.40 ± 8.96 kPa is observed after the addition of 10 wt % V2O5 nanofiber into the polymer.

Investigating the self-healing property of an optical Airy beam

2015 ◽  
Vol 40 (21) ◽  
pp. 5066 ◽  
Author(s):  
Liyun Zhang ◽  
Fengjuan Ye ◽  
Mingtao Cao ◽  
Dong Wei ◽  
Pei Zhang ◽  
...  
Keyword(s):  
The Self ◽  
Self Healing ◽  
Airy Beam ◽  
Healing Property

scholarly journals A Self-Healing Coating with UV-Shielding Property

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 421 ◽  
Author(s):  
Lei Peng ◽  
Musong Lin ◽  
Sheng Zhang ◽  
Li Li ◽  
Qiang Fu ◽  
...  
Keyword(s):  
Moisture Absorption ◽  
Healing Process ◽  
Ultra Violet ◽  
The Self ◽  
Self Healing ◽  
Soft Substrate ◽  
Water Contact ◽  
Uv Shielding ◽  
Host Guest Complex ◽  
Healing Property

A self-healing coating with UV-shielding property was prepared in this paper. The self-healing property was based on the inclusion between a host (β-CD-TiO2) and a guest HEMA-Ad). After inclusion of the host and guest, the host–guest complex (HEMA-Ad/β-CD-TiO2) was polymerized with other reactive monomers (HEMA and BA) to obtain the final coating. The coating had good hydrophobicity (water contact angle >90°, moisture absorption rate <2%) and excellent UV-shielding performance (ultra-violet protect factor >90%), and could be firmly bonded to a soft substrate. In addition, the coating had good self-healing property, which means that cracks in the material can recover many times after being damaged and that the UV-shielding ability can be fully restored with the self-healing process.

Multilayer Coatings Using Epoxy and Superabsorbent Polymer Composite Material with Self Healing Property

2020 ◽  
Vol 861 ◽  
pp. 202-212
Author(s):  
Ariel Verzosa Melendres ◽  
Mel Bryan L. Espenilla ◽  
Araceli M. Monsada ◽  
Rolan Pepito Vera Cruz
Keyword(s):  
Composite Material ◽  
Sodium Chloride ◽  
Carbon Steel ◽  
Sea Water ◽  
Multilayer Coating ◽  
Steel Specimen ◽  
Polymer Composite Material ◽  
Superabsorbent Polymer ◽  
Self Healing ◽  
Healing Property

The property of superabsorbent polymer (SAP) was investigated as component of composite material for corrosion control application. The composite material is a multilayer coating consisting of SAP particles, epoxy and hardener. The absorption property of SAP at different concentrations of sodium chloride was measured. It included 3% NaCl concentration, which represent the concentration of salt in sea water, an environment which is corrosive to carbon steel. Results showed decreasing absorbency of SAP at increasing concentration of sodium chloride. Predetermined amount of SAP and epoxy were mixed to obtain a homogenous mixture after which the hardener was added and mixed homogenously to form the composite material’s main component. The composite material was studied for absorption properties in an HDPLE substrate and then later applied onto a carbon steel specimen of size 40 mm x 100 cm and thickness of 0.70 mm using paint brush forming a film on the carbon steel surface. After curing, the film was scratched with a definite length using a sharp knife. Immediately, the samples were exposed to cyclic immersion in 3% sodium chloride solution and subsequent drying to run the corrosion test. Results showed that the composite material was able to control corrosion on the surface of the carbon steel which could be attributed to its self-healing property.

scholarly journals Self-Healing Hydrogels with both LCST and UCST through Cross-Linking Induced Thermo-Response

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 490 ◽  
Author(s):  
Haifeng Zhao ◽  
Heng An ◽  
Baozhong Xi ◽  
Yan Yang ◽  
Jianglei Qin ◽  
...  
Keyword(s):  
Sol Gel ◽  
Covalent Bond ◽  
The Self ◽  
Solution Temperature ◽  
Cross Linking ◽  
Self Healing ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Healing Property ◽  
Sol Gel Transition

Self-healing hydrogels have drawngreat attention in the past decade since the self-healing property is one of the characteristics of living creatures. In this study, poly(acrylamide-stat-diacetone acrylamide) P(AM-stat-DAA) with a pendant ketone group was synthesized from easy accessible monomers, and thermo-responsive self-healing hydrogels were prepared through a series of diacylhydrazide compounds cross-linking without any additional stimulus. Although the copolymers do not show thermo-response, the hydrogels became thermo-responsive andboth the lower critical solution temperature (LCST) and upper critical solution temperature (UCST) varied with the composition of the copolymer and structure of cross-linkers. With a dynamic covalent bond connection, the hydrogel showed gel-sol-gel transition triggered by acidity, redox, and ketone to acylhydrazide group ratios. This is another interesting cross-linking induced thermo-responsive (CIT) hydrogel with different properties compared to PNIPAM-based thermo-responsive hydrogels. The self-healing hydrogel with CIT properties could have great potential for application in areas related to bioscience, life simulation, and temperature switching.

Multi-stimuli responsive self-healing metallo-hydrogels: tuning of the gel recovery property

2014 ◽  
Vol 50 (18) ◽  
pp. 2356-2359 ◽  
Author(s):  
Shibaji Basak ◽  
Jayanta Nanda ◽  
Arindam Banerjee
Keyword(s):  
Chain Length ◽  
The Self ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Healing Property

Self-healable, multi-stimuli responsive metallo-hydrogels based on a series of tyrosine containing amphiphiles have been discovered. Formation of these metallo-gels is highly selective to Ni2+ ions. Moreover, the self-healing property can be modulated by varying the chain length of the corresponding gelator amphiphiles.

scholarly journals Self-healing phenomena of graphene: potential and applications

Open Physics ◽  
2016 ◽  
Vol 14 (1) ◽  
pp. 364-370 ◽  
Author(s):  
K. VijayaSekhar ◽  
Swati Ghosh Acharyya ◽  
Sanghamitra Debroy ◽  
V. Pavan Kumar Miriyala ◽  
Amit Acharyya
Keyword(s):  
Graphene Sheet ◽  
Crack Opening ◽  
Single Layer ◽  
The Self ◽  
Single Layer Graphene ◽  
Uniaxial Tensile ◽  
Self Healing ◽  
Critical Crack ◽  
Layer Graphene ◽  
Nano Sensors

AbstractThe present study investigates the self healing behavior of both pristine and defected single layer graphene using a molecular dynamic simulation. Single layer graphene containing various defects such as preexisting vacancies and differently oriented pre-existing cracks were subjected to uniaxial tensile loading till fracture occurred. Once the load was relaxed, the graphene was found to undergo self healing. It was observed that this self healing behaviour of cracks holds irrespective of the nature of pre-existing defects in the graphene sheet. Cracks of any length were found to heal provided the critical crack opening distance lies within 0.3-0.5 nm for a pristine sheet and also for a sheet with pre-existing defects. Detailed bond length analysis of the graphene sheet was done to understand the mechanism of self healing of graphene. The paper also discusses the immense potential of the self healing phenomena of graphene in the field of graphene based sub-nano sensors for crack sensing.

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