Study of the impact of sequence of corrosion inhibitor doping in zeolite on the self-healing properties of silane sol–gel film

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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Effects of the Self-Healing Microcapsules on the Impact Property of Polymer Composite Gear

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.683 ◽

2011 ◽

Vol 66-68 ◽

pp. 683-687 ◽

Cited By ~ 1

Author(s):

Li Zhang ◽

Yan Jue Gong ◽

Shuo Zhang

Keyword(s):

Glass Fiber ◽

Polymer Composite ◽

The Self ◽

Impact Property ◽

Self Healing ◽

Fiber Reinforced ◽

Mechanical Impact ◽

Glass Fiber Reinforced ◽

The Impact

By designing the different formulations of the composites and adopting optimized technology including extrusion and molding, the effects of the Micro-capsules on the properties of nylon composites are analyzed by the impact property test. The mechanical impact property of the glass fiber reinforced nylon composites is influenced little if the content of the self-healing microcapsules added is less than 3.5%, and the technology of self-healing microcapsules used in the polymer composite gear is feasible.

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The effects of textile reinforcements on the protective properties of self-healing polymers intended for safety gloves

Textile Research Journal ◽

10.1177/0040517520904374 ◽

2020 ◽

Vol 90 (17-18) ◽

pp. 1974-1986

Author(s):

Emilia Irzmańska ◽

Anna Bacciarelli-Ulacha ◽

Agnieszka Adamus-Włodarczyk ◽

Anna Strąkowska

Keyword(s):

Healing Process ◽

Polymeric Composite ◽

Polymeric Materials ◽

Economic Loss ◽

The Self ◽

Raw Material ◽

Protective Equipment ◽

Self Healing ◽

Hybrid Molecules ◽

The Impact

In the environment where glove material is exposed to harmful chemicals, hazards related to faster penetration of dangerous substances into the glove interior may cause microdamage. One of the solutions to overcome this problem is to use the self-healing polymeric materials that can minimize economic loss and accidents in the workplace. The current work aims to present the impact of different types of textile reinforcement on the effectiveness and efficiency of the self-healing process of methyl vinyl silicone rubber containing hybrid molecules with an inorganic silsesquioxane intended for use on all-rubber gloves. Three knitted fabrics with a similar structure and differentiated raw material composition were selected: polyamide, cotton–polyamide, and cotton. Evaluation of the self-healing process of the elastomeric composite to personal protective equipment was performed. For this purpose the assessment of the surface morphology of materials has been performed before and after the self-healing process. The implementation of knitted fabric into the polymeric composite in the tested samples allowed us to obtain the best results in all tests. The studied composite samples exhibited an increased resistance to three types of damage: penetration, abrasion and puncture. The samples also underwent the self-healing processes and regeneration after a proper conditioning period. Thus, the obtained results confirmed the possibility of using tested elastomeric composites in the construction of protective gloves and showed an effectivity of the self-healing process for the long-term usage of that protective equipment.

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Preparation and Performance of Self-Healing Epoxy Composites by Microcapsulated Approach

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.636.73 ◽

2014 ◽

Vol 636 ◽

pp. 73-77 ◽

Cited By ~ 1

Author(s):

Xin Hua Yuan ◽

Qiu Su ◽

Li Yin Han ◽

Qian Zhang ◽

Yan Qiu Chen ◽

...

Keyword(s):

Impact Strength ◽

Epoxy Matrix ◽

The Self ◽

Epoxy Composites ◽

Fracture Plane ◽

Crack Plane ◽

Curing Agent ◽

Self Healing ◽

Healing Agent ◽

The Impact

Microencapsulated E-51 epoxy resin healing agent and phthalic anhydride latent curing agent were incorporated into E-44 epoxy matrix to prepare self-healing epoxy composites. When cracks were initiated or propagated in the composites, the microcapsules would be damaged and the healing agent released. As a result, the crack plane was healed through curing reaction of the released epoxy latent curing agent. In the paper, PUF/E-51 microcapsules were prepared by in-situ polymerization. The mechanical properties of the epoxy composites filled with the self-healing system were evaluated. The impact strength and self-healing efficiency of the composites are measured using a Charpy Impact Tester. Both the virgin and healed impact strength depends strongly on the concentration of microcapsules added into the epoxy matrix. Fracture of the neat epoxy is brittle, exhibiting a mirror fracture surface. Addition of PUF/E-51 microcapsules decreases the impact strength and induces a change in the fracture plane morphology to hackle markings. In the case of 8.0 wt% microcapsules and 3.0 wt% latent hardener, the self-healing epoxy exhibited 81.5% recovery of its original fracture toughness.

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Active corrosion protection performance of an epoxy coating applied on the mild steel modified with an eco-friendly sol-gel film impregnated with green corrosion inhibitor loaded nanocontainers

Applied Surface Science ◽

10.1016/j.apsusc.2018.01.185 ◽

2018 ◽

Vol 440 ◽

pp. 491-505 ◽

Cited By ~ 39

Author(s):

M. Izadi ◽

T. Shahrabi ◽

B. Ramezanzadeh

Keyword(s):

Mild Steel ◽

Corrosion Inhibitor ◽

Corrosion Protection ◽

Sol Gel ◽

Epoxy Coating ◽

Green Corrosion Inhibitor ◽

Gel Film ◽

Active Corrosion

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Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency

Coatings ◽

10.3390/coatings11111328 ◽

2021 ◽

Vol 11 (11) ◽

pp. 1328

Author(s):

Chloé Paquet ◽

Stephen Brown ◽

Jolanta E. Klemberg-Sapieha ◽

Jean-François Morin ◽

Véronic Landry

Keyword(s):

Crosslinking Density ◽

Wood Products ◽

The Self ◽

Mechanical Resistance ◽

Self Healing ◽

Uv Curable ◽

Monomer Structure ◽

Healing Efficiency ◽

Wood Flooring ◽

The Impact

Wood is increasingly used in construction for the benefits it brings to occupants and for its ecological aspect. Indoor wood products are frequently subject to mechanical aggressions, their abrasion and scratch resistance thus need to be improved. The coating system ensures the wood surface protection, which is, for wood flooring, a multilayer acrylate UV-curable 100% solid system. To increase the service life of wood flooring, a new property is studied: self-healing. The objective of this study is to observe the impact of monomer structure on self-healing efficiency and the effect of self-healing parameters. A previous formulation was developed using hydrogen bond technology to generate the self-healing property. In this paper, the assessment of the formulation and the self-healing parameters’ impact on self-healing efficiency as well as the physicochemical properties are presented. The composition of the monomer part in the formulations was varied, and the effect on the conversion yield (measured by FT-IR), on the Tg and crosslinking density (measured by DMA) and on mechanical resistance (evaluated via hardness pendulum, indentation, and reverse impact) was analyzed. The self-healing efficiency of the coatings was determined by gloss and scratch depth measurements (under constant and progressive load). It was proven that monomers with three acrylate functions bring too much crosslinking, which inhibits the chain mobility necessary to observe self-healing. The presence of the AHPMA monomer in the formulation permits considerably increasing the crosslinking density (CLD) while keeping good self-healing efficiency. It was also observed that the self-healing behavior of the coatings is different according to the damage caused. Indeed, the self-healing results after abrasion and after scratch (under constant or progressive load) are different. In conclusion, it is possible to increase CLD while keeping self-healing behavior until a certain limit and with a linear monomer structure to avoid steric hindrance. Moreover, the selection of the best coatings (the one with the highest self-healing) depends on the damage.

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Does Oxygen Content Play a Role in Spontaneous Closure of Perimembranous Ventricular Septal Defects?

Children ◽

10.3390/children8100881 ◽

2021 ◽

Vol 8 (10) ◽

pp. 881

Author(s):

Pier Paolo Bassareo ◽

Giuseppe Calcaterra ◽

Martino Deidda ◽

Andrea Raffaele Marras ◽

Giuseppe Mercuro

Keyword(s):

Regression Analysis ◽

Oxygen Content ◽

Linear Regression Analysis ◽

Multiple Logistic Regression Analysis ◽

Spontaneous Closure ◽

The Self ◽

Self Healing ◽

Ventricular Septal Defects ◽

Septal Defects ◽

The Impact

(1) Background: the impact of a series of laboratory parameters (haemoglobin, haematocrit, foetal haemoglobin, peripheral oxygen saturation, iron, transferrin, ferritin, and albumin) on perimembranous ventricular septal defects spontaneous healing was tested. (2) Methods: one hundred and seven patients were enrolled in the study (57% males; mean age 2.1 ± 0.4 years) and were subsequently subdivided into two groups: self-healing (n = 36) and in need of intervention (n = 71). Self-healing subjects were defined on the basis of an absence of residual shunts at colorDoppler across the previous defect. (3) Results: no statistically significant differences were reported in the size of perimembranous ventricular septal defects between the two groups (p = ns). Conversely, prevalence of anaemia was significantly higher in those requiring intervention than in the self-healing group (p < 0.03), while haemoglobin, iron, ferritin, and albumin levels were lower (p < 0.001, p < 0.05, p < 0.02, p < 0.007, respectively). In multivariable linear regression analysis, only haemoglobin and albumin were found to be associated with spontaneous closure (p < 0.005 and p < 0.02, respectively). In multiple logistic regression analysis, haemoglobin independently increased the probability of self-healing of perimembranous ventricular septal defects (p = 0.03). All patients needing an interventional closure of perimembranous ventricular septal defects presented with haemoglobin <12.7 g/dL. (4) Conclusion: the self-resolution of perimembranous ventricular septal defects seems to rely on numerous factors, including oxygen content, which is likely to promote cell proliferation as well as tissue regeneration. Haemoglobin blood concentration seems to influence the natural history of perimembranous ventricular septal defects and improvement of anaemia by supplementation of iron intake might represent a simple and reliable method to promote self-healing.

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

Polymers ◽

10.3390/polym11030490 ◽

2019 ◽

Vol 11 (3) ◽

pp. 490 ◽

Cited By ~ 3

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.

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Understanding the enhancement and temperature-dependency of the self-healing and electromechanical properties of dielectric elastomers containing mixed pendant polar groups

Journal of Materials Chemistry C ◽

10.1039/d0tc00509f ◽

2020 ◽

Vol 8 (16) ◽

pp. 5426-5436 ◽

Cited By ~ 2

Author(s):

Christopher Ellingford ◽

Alan M. Wemyss ◽

Runan Zhang ◽

Ivan Prokes ◽

Tom Pickford ◽

...

Keyword(s):

Hydrogen Bonding ◽

Electrostatic Interactions ◽

The Self ◽

Dielectric Elastomers ◽

Temperature Dependency ◽

Self Healing ◽

Electromechanical Properties ◽

Polar Groups ◽

The Impact

New insights on the impact of the hydrogen bonding and electrostatic interactions on the temperature-dependencies of the self-healing and electromechanical properties of the dielectric elastomers.

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Detailed Analysis of the Influencing Parameters on the Self-Healing Behavior of Dynamic Urea-Crosslinked Poly(methacrylate)s

Molecules ◽

10.3390/molecules24193597 ◽

2019 ◽

Vol 24 (19) ◽

pp. 3597 ◽

Cited By ~ 2

Author(s):

Abend ◽

Zechel ◽

Schubert ◽

Hager

Keyword(s):

Detailed Analysis ◽

Mechanical Performance ◽

Healing Process ◽

Polymer Networks ◽

Healing Time ◽

The Self ◽

Self Healing ◽

Influencing Parameters ◽

The Impact

For this paper, the self-healing ability of poly(methacrylate)s crosslinked via reversible urea bonds was studied in detail. In this context, the effects of healing time and temperature on the healing process were investigated. Furthermore, the impact of the size of the damage (i.e., area of the scratch) was monitored. Aging processes, counteracting the self-healing process, result in a decrease in the mechanical performance. This effect diminishes the healing ability. Consequently, the current study is a first approach towards a detailed analysis of self-healing polymers regarding the influencing parameters of the healing process, considering also possible aging processes for thermo-reversible polymer networks.

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