Effect of epoxy resin healing agent viscosity on the self-healing performance of capsules reinforced polymer composite

2021 ◽  
Vol 28 (4) ◽  
Author(s):  
Raj Kumar Pittala ◽  
Satish Ben B ◽  
Avinash Ben B
Keyword(s):  
Epoxy Resin ◽  
Polymer Composite ◽  
The Self ◽  
Self Healing ◽  
Reinforced Polymer ◽  
Healing Agent

A Self-Repair Mode for Capillary Reinforced Polymer Composite

2013 ◽  
Vol 575-576 ◽  
pp. 147-150
Author(s):  
Xin Hua Yuan ◽  
Ji Ye Wu ◽  
Yong Qiang Liu ◽  
Jun Xia Mao ◽  
Xue Tao Ou ◽  
...  
Keyword(s):  
Impact Damage ◽  
The Self ◽  
Self Healing ◽  
Reinforced Polymer ◽  
Flexural Testing ◽  
Reinforced Plastic ◽  
Crack Morphology ◽  
Healing Agent ◽  
Self Repair ◽  
The Impact

The paper describes a novel capillary reinforced plastic which can self-repair the impact damage in polymer composites through employing a bio-mimetic approach. A epoxy resin E-51 and harder WSR706# was used as the healing agent, the two components being filled in to different directions (0°and 90° fibers). Impact test and tensile test were used as a measure of the self-healing effectiveness. The results of flexural testing have shown that strength lost after impact damage can be restored by the self-healing effect with healing agent stored in capillaries, and a significant fraction (about 79%) of lost mechanical strength is restored by this effect. At the same time, the paper also studied the morphology of fracture surface of no embedded and capillaries embedded sample. And micrographs of crack morphology which has been healed have been observed.

MECHANICAL PROPERTIES AND SELF-HEALING MECHANISM OF EPOXY MORTAR

2015 ◽  
Vol 77 (12) ◽  
Author(s):  
Nur Farhayu Ariffin ◽  
Mohd Warid Hussin ◽  
Abdul Rahman Mohd Sam ◽  
Han Seung Lee ◽  
Nur Hafizah A. Khalid ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Healing Process ◽  
Control Sample ◽  
Pulse Velocity ◽  
The Self ◽  
Fine Aggregate ◽  
Self Healing ◽  
Velocity Measurements ◽  
Hydroxyl Ion ◽  
Healing Agent

Crack deformation in concrete start with hairline crack or micro-crack which can lead to major crack if not prevented. Crack can cause a major deterioration to the structure as liquid can penetrate inside and cause damage as a result; the durability of concrete will decrease. Self-healing concrete was introduced to automatically repair hairline crack or micro-crack without external intervention. Previous study had shown that by introducing bacteria into the concrete, the crack will heal itself. This paper presents the study on self-healing mortar by using epoxy resin without hardener as a self-healing agent. The self-healing process was evaluated using Ultrasonic Pulse Velocity measurements up to 180 days. Mortar specimens were prepared with mass ratio of 1:3 (cement: fine aggregate), water-cement ratio of 0.48 and 10% epoxy resin of cement content. All tested specimens were subjected to wet-dry curing; where compressive strength, flexural strength, and tensile splitting strength and self-healing mechanism were measured. The results obtained shows that, all strength properties of the self-healing epoxy mortar were significantly higher than the control sample and became constant at 10 % of epoxy resin content. Based on the pulse velocity measurements, after 60 days the cracks of the mortar healed automatically as a result of the reaction between the unhardened epoxy resin and hydroxyl ion from cement hydrate. This shows the ability of the epoxy to be used as self-healing agent. 

Numerical investigation into effect of self-healing composite microcapsules thickness and diameter on their failure strength

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Raj Kumar Pittala ◽  
Satish Ben B. ◽  
Syam Kumar Chokka ◽  
Niranjan Prasad
Keyword(s):  
Matrix Composite ◽  
Polymer Matrix ◽  
Shell Thickness ◽  
Polymer Matrix Composite ◽  
Thickness Effect ◽  
Failure Strength ◽  
Self Healing ◽  
Content Type ◽  
Reinforced Polymer ◽  
Healing Agent

Purpose Microcapsule-embedded autonomic healing materials have the ability to repair microcracks when they come into contact with the crack by releasing the healing agent. The microcapsules with specific shape and thickness effect in releasing healing agent to the cracked surfaces. Thus, the purpose of this paper is to know the load bearing capacity of the self-healing microcapsules and the stresses developed in the material. Design/methodology/approach In the present study, self-healing microcapsule is modelled and integrated with the polymer matrix composite. The aim of the present study is to investigate failure criteria of Poly (methyl methacrylate) microcapsules by varying the shell thickness, capsule diameter and loading conditions. The strength of the capsule is evaluated by keeping the shell thickness as constant and varying the capsule diameter. Uniformly distributed pressure loads were applied on the capsule-reinforced polymer matrix composite to assess the failure strength of capsules and composite. Findings It is observed from the results that the load required to break the capsules is increasing with the increase in capsule diameter. The failure strength of microcapsule with 100 µm diameter and 5 µm thickness is observed as 255 MPa. For an applied load range of 40–160 N/mm2 on the capsules embedded composite, the maximum stress developed in the capsules is observed as 308 MPa. Originality/value Failure strengths of microcapsules and stresses developed in the microcapsule-reinforced polymer composites were evaluated.

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

2011 ◽  
Vol 66-68 ◽  
pp. 683-687 ◽  
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.

Advanced Fiber Reinforced Self-Healing Ceramics for Middle Range Temperature

2019 ◽  
Vol 810 ◽  
pp. 119-124
Author(s):  
Wataru Nakao ◽  
Taira Hayakawa ◽  
Tesuro Yanaseko ◽  
Shingo Ozaki
Keyword(s):  
Low Temperature ◽  
Turbine Blade ◽  
The Self ◽  
Self Healing ◽  
Fiber Reinforced ◽  
Low Pressure Turbine ◽  
Middle Range ◽  
The Matrix ◽  
Healing Agent ◽  
Technical Issues

The availability of TiC healing agent has been evaluated in low temperature self-healing behavior of Al2O3 based self-healing ceramics. For this purpose, some technical issues to actualize the advanced fiber-reinforced self-healing ceramics containing TiC based interlayer as healing agent were discussed. Especially, the mechanical matching between the matrix and the interlayer was focused. Moreover, the self-healing behavior of the advanced shFRC containing the optimized TiC based healing agent was investigated. As a result, 30 vol% TiC-70 vol% Al2O3 interlayer was confirmed to be the optimized healing agent in the self-healing ceramics, and the self-healing ceramics was found to enable to attain the perfect healing at 600°C within 10 min. And we succeeded in prototype production of fiber-reinforced self-healing ceramics for low pressure turbine blade.

From Wear to Self Healing in Nanostructured Biological and Technical Surfaces

2009 ◽  
Author(s):  
Michael Nosonovsky
Keyword(s):  
Crack Propagation ◽  
Theoretical Framework ◽  
The Self ◽  
Solid Surfaces ◽  
Self Healing ◽  
Equilibrium Thermodynamics ◽  
Biological Surfaces ◽  
Healing Agent ◽  
Non Equilibrium

Wear occurs at most solid surfaces that come in contact with other solid surfaces. While biological surfaces and tissues usually have the ability for self-healing, engineered self-healing materials only started to emerge recently. An example of a smart self-healing material is the materials with embedded microcapsules, which rupture during crack propagation and release a healing agent that repairs the crack. We discuss the conditions under which the self-healing occurs and provide a general theoretical framework and criteria for self-healing using the concept of multiscale organization of entropy and non-equilibrium thermodynamics.

Self-switchable catalysis by a nature-inspired polymer nanoreactor containing Pt nanoparticles

2014 ◽  
Vol 2 (19) ◽  
pp. 6834-6839 ◽  
Author(s):  
Yong Zhou ◽  
Maiyong Zhu ◽  
Songjun Li
Keyword(s):  
Metal Nanoparticles ◽  
Polymer Composite ◽  
Pt Nanoparticles ◽  
The Self ◽  
Self Healing

The proposed nanoreactor was made of Pt nanoparticles and a unique polymer composite of PVI and PTFMA. The self-healing and dissociation of the PVI–PTFMA interaction regulated access to the encapsulated metal nanoparticles, thereby causing self-switchable catalytic ability.

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

2014 ◽  
Vol 636 ◽  
pp. 73-77 ◽  
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.

scholarly journals Biological Self-Healing of Cement Paste and Mortar by Non-Ureolytic Bacteria Encapsulated in Alginate Hydrogel Capsules

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3711
Author(s):  
Mohammad Fahimizadeh ◽  
Ayesha Diane Abeyratne ◽  
Lee Sui Mae ◽  
R. K. Raman Singh ◽  
Pooria Pasbakhsh
Keyword(s):  
Cement Paste ◽  
Healing Process ◽  
Cementitious Materials ◽  
The Self ◽  
Self Healing ◽  
Alkaline Conditions ◽  
Healing Agent ◽  
Encapsulated Bacteria ◽  
The Right

Crack formation in concrete is one of the main reasons for concrete degradation. Calcium alginate capsules containing biological self-healing agents for cementitious materials were studied for the self-healing of cement paste and mortars through in vitro characterizations such as healing agent survivability and retention, material stability, and biomineralization, followed by in situ self-healing observation in pre-cracked cement paste and mortar specimens. Our results showed that bacterial spores fully survived the encapsulation process and would not leach out during cement mixing. Encapsulated bacteria precipitated CaCO3 when exposed to water, oxygen, and calcium under alkaline conditions by releasing CO32− ions into the cement environment. Capsule rupture is not required for the initiation of the healing process, but exposure to the right conditions are. After 56 days of wet–dry cycles, the capsules resulted in flexural strength regain as high as 39.6% for the cement mortar and 32.5% for the cement paste specimens. Full crack closure was observed at 28 days for cement mortars with the healing agents. The self-healing system acted as a biological CO32− pump that can keep the bio-agents retained, protected, and active for up to 56 days of wet-dry incubation. This promising self-healing strategy requires further research and optimization.

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