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Статті в журналах з теми "MICROENCAPSULATED HEALING AGENTS"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Lee, Jim, Debes Bhattacharyya, Ming Qiu Zhang, Yiu Wing Mai, and Yan Chao Yuan. "Compression Behavior of a Self-Healing Fibre Reinforced Epoxy Composite." Applied Mechanics and Materials 55-57 (May 2011): 1281–86. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.1281.

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The concept of introducing self-healing capabilities in polymer materials and systems has been based on mimicking biological self-healing materials and systems, for example, materials like proteins have phenomenal capabilities in self-healing damaged biological structures. This work has been extended to investigate self-healing capabilities of fibre reinforced epoxy composites. Microencapsulated epoxy and mercaptan healing agents were incorporated into a glass fibre reinforced epoxy matrix to produce a polymer composite capable of self-healing. The specimens containing the microencapsulated epoxy and mercaptan healing agents did gain excellent strength and achieved a healing efficiency up to 140%.

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Schreiner, Claus, Sabine Scharf, Volkmar Stenzel, and Albert Rössler. "Self-healing through microencapsulated agents for protective coatings." Journal of Coatings Technology and Research 14, no. 4 (May 31, 2017): 809–16. http://dx.doi.org/10.1007/s11998-017-9921-x.

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Litina, Chrysoula, and Abir Al-Tabbaa. "Development of sustainable concrete repair materials via microencapsulated agents." MATEC Web of Conferences 289 (2019): 11002. http://dx.doi.org/10.1051/matecconf/201928911002.

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Identification of non-structural damage in concrete infrastructure and actuation of preventive repair solutions is an established approach to avoid further structural damages and more expensive repair regimes. However the repair of concrete itself is not infallible with 55% of reported repairs in the EU failing within 5 years of service. Thus the already once repaired concrete structure is then subject to a constant cycle of repeated repair and a cumulative associated life cycle cost. The development of external repair material with self-healing capabilities, can affect a real step-change on the life-cycle costs and maintenance of existing and new infrastructure. Developed polymeric microcapsules containing liquid sodium silicate were used to impart autonomic self-healing to readily available commercial repair mortars for the first time. These materials cover a range of potential real time repair applications. Initially the compatibility between the developed self-healing agents and commercial products was established and the self-healing performance of the novel composite system was then evaluated. The results underlined the huge potential for the proposed composite systems as a stepping stone toward commercial uptake of self-healing microcapsule-based cementititious materials.

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Ghazali, Habibah, Lin Ye, and Amie N. Amir. "Microencapsulated healing agents for an elevated-temperature cured epoxy: Influence of viscosity on healing efficiency." Polymers and Polymer Composites 29, no. 9_suppl (November 2021): S1317—S1327. http://dx.doi.org/10.1177/09673911211045373.

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Among many applications, elevated-temperature cured epoxy resins are widely used for high-performance applications especially for structural adhesive and as a matrix for structural composites. This is due to their superior chemical and mechanical properties. The thermosetting nature of epoxy produces a highly cross-linked polymer network during the curing process where the resulting material exhibited excellent properties. However, due to this cross-linked molecular structure, epoxies are also known to be brittle, and once a crack initiated in the material, it is difficult to arrest the crack propagation. Earlier research found that the inclusion of encapsulated healing agents is able to introduce self-healing ability to the room-temperature cured epoxies. The current study investigated the self-healing behaviour of an elevated-temperature cured epoxy, which incorporated the dual-capsule system loaded with diglycidyl-ether of bisphenol-A (DGEBA) resin and mercaptan. The microcapsules were prepared by the in-situ polymerisation method while the fracture toughness and the self-healing capability of the tapered-double-cantilever-beam (TDCB) epoxy specimens were measured under Mode-I fracture toughness testing. We investigated the effect of temperature on viscosity of the healing agents and how these values influence the formation of uniform healing on the fracture surfaces. It was found that incorporation of the dual-capsule self-healing system onto an elevated-temperature cured epoxy slightly changed the fracture toughness of the epoxy as indicated by the Mode-I testing. In the case of thermal healing at 70°C, the self-healing epoxy exhibited a recovery of up to 111% of its original fracture toughness, where a uniform spreading of the healant was observed. The excellent healing behaviour is attributed to the lower viscosity of the healant at higher temperature and the higher glass transition temperature ( Tg) of the produced healant film. The DSC analysis confirmed that the healing process was not contributed by the post-curing of the host epoxy.

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Zhu, Dong Yu, Min Zhi Rong, and Ming Qiu Zhang. "Self-healing polymeric materials based on microencapsulated healing agents: From design to preparation." Progress in Polymer Science 49-50 (October 2015): 175–220. http://dx.doi.org/10.1016/j.progpolymsci.2015.07.002.

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Kim, Sang Yup, Amanda R. Jones, Nancy R. Sottos, and Scott R. White. "Manufacturing of unidirectional glass/epoxy prepreg with microencapsulated liquid healing agents." Composites Science and Technology 153 (December 2017): 190–97. http://dx.doi.org/10.1016/j.compscitech.2017.10.017.

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Nassho, Yasuka, and Kazuaki Sanada. "Microstructure optimizations for improving interlaminar shear strength and self-healing efficiency of spread carbon fiber/epoxy laminates containing microcapsules." Journal of Composite Materials 55, no. 1 (July 22, 2020): 27–38. http://dx.doi.org/10.1177/0021998320943941.

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Анотація:

The purpose of this study is to improve interlaminar shear strength and self-healing efficiency of spread carbon fiber (SCF)/epoxy (EP) laminates containing microcapsules. Microencapsulated healing agents were embedded within the laminates to impart a self-healing functionality. Self-healing was demonstrated on short beam shear specimens, and the healing efficiency was evaluated by strain energies of virgin and healed specimens. The effects of microcapsule concentration and diameter on apparent interlaminar shear strength and healing efficiency were discussed. Moreover, damaged areas after short beam shear tests were examined by an optical microscope to investigate the relation between the microstructure and the healing efficiency of the laminates. The results showed that the stiffness and the apparent interlaminar shear strength of the laminates increased as the microcapsule concentration and diameter decreased. However, the healing efficiency decreased with decreasing the microcapsule concentration and diameter.

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Norambuena-Contreras, Jose, Luis E. Arteaga-Perez, Andrea Y. Guadarrama-Lezama, Rodrigo Briones, Juan F. Vivanco, and Irene Gonzalez-Torre. "Microencapsulated Bio-Based Rejuvenators for the Self-Healing of Bituminous Materials." Materials 13, no. 6 (March 22, 2020): 1446. http://dx.doi.org/10.3390/ma13061446.

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Asphalt self-healing by encapsulated rejuvenating agents is considered a revolutionary technology for the autonomic crack-healing of aged asphalt pavements. This paper aims to explore the use of Bio-Oil (BO) obtained from liquefied agricultural biomass waste as a bio-based encapsulated rejuvenating agent for self-healing of bituminous materials. Novel BO capsules were synthesized using two simple dripping methods through dropping funnel and syringe pump devices, where the BO agent was microencapsulated by external ionic gelation in a biopolymer matrix of sodium alginate. Size, surface aspect, and elemental composition of the BO capsules were characterized by optical and scanning electron microscopy and energy-dispersive X-ray spectroscopy. Thermal stability and chemical properties of BO capsules and their components were assessed through thermogravimetric analysis (TGA-DTG) and Fourier-Transform Infrared spectroscopy (FTIR-ATR). The mechanical behavior of the capsules was evaluated by compressive and low-load micro-indentation tests. The self-healing efficiency over time of BO as a rejuvenating agent in cracked bitumen samples was quantified by fluorescence microscopy. Main results showed that the BO capsules presented an adequate morphology for the asphalt self-healing application, with good thermal stability and physical-chemical properties. It was also proven that the BO can diffuse in the bitumen reducing the viscosity and consequently self-healing the open microcracks.

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Roig-Flores, M., S. Formagini, and P. Serna. "Self-healing concrete-What Is it Good For?" Materiales de Construcción 71, no. 341 (March 9, 2021): e237. http://dx.doi.org/10.3989/mc.2021.07320.

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Анотація:

Self-healing of concrete is the process in which the material regenerates itself repairing inner cracks. This process can be produced by autogenous or autonomous healing. Autogenous healing is a natural process, produced by carbonation and/or continuing hydration. Autonomous healing is based on the use of specific agents to produce self-healing, which can be added directly to the concrete matrix, embedded in capsules or introduced through vascular networks. Some examples are superabsorbent polymers, crystalline admixtures, microencapsulated sodium silicate, and bacteria. This review is structured into two parts. The first part is an overview of self-healing concrete that summarises the basic concepts and the main advances produced in the last years. The second part is a critical discussion on the feasibility of self-healing concrete, its possibilities, current weaknesses, and challenges that need to be addressed in the coming years.

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Zhou, Shuai, Yue Jia, and Chong Wang. "Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites." Polymers 12, no. 12 (December 15, 2020): 2990. http://dx.doi.org/10.3390/polym12122990.

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Анотація:

Cementitious composites with microencapsulated healing agents are appealing due to the advantages of self-healing. The polymeric shell and polymeric healing agents in microcapsules have been proven effective in self-healing, while these microcapsules decrease the effective elastic properties of cementitious composites before self-healing happens. The reduction of effective elastic properties can be evaluated by micromechanics. The substantial complicacy included in micromechanical models leads to the need of specifying a large number of parameters and inputs. Meanwhile, there are nonlinearities in input–output relationships. Hence, it is a prerequisite to know the sensitivity of the models. A micromechanical model which can evaluate the effective properties of the microcapsule-contained cementitious material is proposed. Subsequently, a quantitative global sensitivity analysis technique, the Extended Fourier Amplitude Sensitivity Test (EFAST), is applied to identify which parameters are required for knowledge improvement to achieve the desired level of confidence in the results. Sensitivity indices for first-order effects are computed. Results show the volume fraction of microcapsules is the most important factor which influences the effective properties of self-healing cementitious composites before self-healing. The influence of interfacial properties cannot be neglected. The research sheds new light on the influence of parameters on microcapsule-contained self-healing composites.

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Kim, Sang Yup, Tae-Wook Lim, Nancy R. Sottos, and Scott R. White. "Manufacture of carbon-fiber prepreg with thermoplastic/epoxy resin blends and microencapsulated solvent healing agents." Composites Part A: Applied Science and Manufacturing 121 (June 2019): 365–75. http://dx.doi.org/10.1016/j.compositesa.2019.03.033.

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Truong, Thuy Thu, and Le-Thu T. Nguyen. "MICROENCAPSULATION OF MERCAPTAN USING POLYCAPROLACTONE AS SHELL MATERIAL TOWARD SELF-HEALING COATING APPLICATIONS." Vietnam Journal of Science and Technology 56, no. 3B (September 13, 2018): 137. http://dx.doi.org/10.15625/2525-2518/56/3b/12739.

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Polymer materials incorporating microencapsulated self-healing agents have a wide range of application from paint coating, anti-corrosion coatings to automotive and construction materials. In this research, microcapsules containing reactive mercaptan compound for use in self healing polymers were successfully fabricated via the oil-in-water emulsion method. We employed for the first time the UV-initiated thiol-ene reaction between an alkene-functionalized polycaprolactone and a tetrathiol compound to form the microcapsule shell. To synthesize microcapsules, the tetrathiol was used in large excess, thus maintaining inside the microcapsules as the core material. The obtained microcapsules were analyzed by Fourier Transform infrared microscopy, optical microscopy, scanning electron microscopy (SEM) and laser diffraction particle size analysis. The core was extracted by Soxhlet extraction and analyzed by 1H NMR and FTIR spectroscopy.

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SHANAGHI, ALI, PAUL K. CHU, and HADI MORADI. "EFFECT OF INHIBITOR AGENTS ADDITION ON CORROSION RESISTANCE PERFORMANCE OF TITANIA SOL–GEL COATINGS APPLIED ON 304 STAINLESS STEEL." Surface Review and Letters 24, no. 04 (September 13, 2016): 1750055. http://dx.doi.org/10.1142/s0218625x1750055x.

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Hybrid organic–inorganic coatings are deposited on 304 stainless steel substrates by the sol–gel technique to improve the corrosion resistance. A titania-based nanostructured hybrid sol–gel coating is impregnated with three different microencapsulated healing agents (inhibitors) including cerium, Benzotriazole (BTA), and 8-Hydroxyquinoline (8H). Field-emission scanning electron microscopy (FE-SEM) and electrochemical impedance spectroscopy (EIS) are performed to investigate the barrier performance properties. The optimum conditions to achieve corrosion protective coatings for 304 stainless steel were determined. The Nyquist plots demonstrate that the activation time of the coating containing 8H as an organic healing agent shows improved behavior when compared to other coatings including cerium and BTA. Cerium as an inorganic healing agent is second and BTA is third and minimum. An increase in the impedance parameters such as resistance and capacitance as a function of immersion time is achieved in a 3.5[Formula: see text]wt.% NaCl solution by using healing agents such as BTA. Actually, over the course of immersion, the barrier performance behavior of the coatings changes and reduction of the impedance observed from the coatings containing Ce and 8H discloses deterioration of the protection system after immersion for 96[Formula: see text]h of immersion in the 3.5% NaCl solution. However, after 96[Formula: see text]h of immersion time, the concentration of chloride ions is high and causes increase in defects, micro cracks, hole on the surface of hybrid titania nanostructured coating containing Ce and 8H by destruction of coating, and also hybrid titania nanostructured coating containing BTA; BTA is released from coating to improve the resistance of passive film, which is created on the surface.

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Han, Kaihang, J. Woody Ju, Le-Yang Lv, Zhiguo Yan, Xiangsheng Chen, and Yin-fu Jin. "Damage-healing analysis of microencapsulated self-healing concrete subjected to tensile loading using a 2D micromechanical model." International Journal of Damage Mechanics, January 28, 2023, 105678952311517. http://dx.doi.org/10.1177/10567895231151726.

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Self-healing concrete that employs microencapsulated healing agents has been proven to be an effective method for microcrack repairment in the concrete structure. However, there is a lack of efficient tools to evaluate the effect of the parameters of microcapsules on the mechanical behavior of the self-healing concrete. In this paper, the evolution of the damage-healing process of microencapsulated self-healing concrete subjected to tensile loading is numerically analyzed from a microscopic perspective by using a 2D micromechanical model. Based on the deformation and propagation evolution mechanism of microcracks, the contribution of microcracks to the total compliance tensor of microencapsulated self-healing concrete under tensile loading is deduced at various stages. According to the calculated total compliance tensor, the stress-strain and compliance-strain relations of microencapsulated self-healing concrete are discussed with special attention to the stress dropping and strain softening stages. Finally, parametric analysis was conducted using the constructed model to investigate the influence of size and content of microcapsules, the types of healing agent and the initial damage of the concrete on the mechanical behaviors of microencapsulated self-healing concrete. The constructed 2D model is significantly useful for the reasonable selection of the optimal parameters of microencapsulated self-healing concrete.

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Han, Kaihang, Jiann-Wen Woody Ju, Yinghui Zhu, Hao Zhang, Tien-Shu Chang, and Zhengyao Wang. "Mechanical responses of microencapsulated self-healing cementitious composites under compressive loading based on a micromechanical damage-healing model." International Journal of Damage Mechanics, April 28, 2021, 105678952110112. http://dx.doi.org/10.1177/10567895211011239.

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Анотація:

The cementitious composites with microencapsulated healing agents have become a class of hotspots in the field of construction materials, and they have very broad application prospects and research values. The in-depth study on multi-scale mechanical behaviors of microencapsulated self-healing cementitious composites is critical to quantitatively account for the mechanical response during the damage-healing process. This paper proposes a three-dimensional evolutionary micromechanical model to quantitatively explain the self-healing effects of microencapsulated healing agents on the damage induced by microcracks. By virtue of the proposed 3 D micromechanical model, the evolutionary domains of microcrack growth (DMG) and corresponding compliances of the initial, extended and repaired phases are obtained. Moreover, the elaborate studies are conducted to inspect the effects of various system parameters involving the healing efficiency, fracture toughness and preloading-induced damage degrees on the compliances and stress-strain relations. The results indicate that relatively significant healing efficiency, preloading-induced damage degree and the fracture toughness of polymerized healing agent with the matrix will lead to a higher compressive strength and stiffness. However, the specimen will break owing to the nucleated microcracks rather than the repaired kinked microcracks. Further, excessive higher values of healing efficiency, preloading-induced damage degree and the fracture toughness of polymerized healing agent with the matrix will not affect the compressive strength of the cementitious composites. Therefore, a stronger matrix is required. To achieve the desired healing effects, the specific parameters of both the matrix and microcapsules should be selected prudently.

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