Adding Autonomic Healing Capabilities to Polyethylene Oxide

Chipara, Dorina; Flores, Maritza; Pérez, Alberto; Puente, Nancy; Lozano, Karen; Chipara, Mircea

doi:10.1002/adv.21296

Cited by 10 publications

(5 citation statements)

References 29 publications

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“…The early extrinsic microcapsule-based self-healing systems consisted mainly of healing agent-containing microcapsules and catalyst particles dispersed directly into matrices. ,− The healing agent, when released from the broken microcapsules along the formation of cracks, would flow into the cracks and subsequently repair them via polymerization with the catalyst. However, catalysts embedded directly into the coatings always suffer from a fatal issue: the possibility of deactivation due to chemical reactions with the coating matrix.…”

Section: Introductionmentioning

confidence: 99%

UV-Triggered Self-Healing of a Single Robust SiO₂ Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings

Guo

Jia

Tian

et al. 2016

ACS Appl. Mater. Interfaces

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UV-triggered self-healing of single microcapsules has been a good candidate to enhance the life of polymer-based aerospace coatings because of its rapid healing process and healing chemistry based on an accurate stoichiometric ratio. However, free radical photoinitiators used in single microcapsules commonly suffer from possible deactivation due to the presence of oxygen in the space environment. Moreover, entrapment of polymeric microcapsules into coatings often involves elevated temperature or a strong solvent, probably leading to swelling or degradation of polymer shell, and ultimately the loss of active healing species into the host matrix. We herein describe the first single robust SiO2 microcapsule self-healing system based on UV-triggered cationic polymerization for potential application in aerospace coatings. On the basis of the similarity of solubility parameters of the active healing species and the SiO2 precursor, the epoxy resin and cationic photoinitiator are successfully encapsulated into a single SiO2 microcapsule via a combined interfacial/in situ polymerization. The single SiO2 microcapsule shows solvent resistance and thermal stability, especially a strong resistance for thermal cycling in a simulated space environment. In addition, the up to 89% curing efficiency of the epoxy resin in 30 min, and the obvious filling of scratches in the epoxy matrix demonstrate the excellent UV-induced healing performance of SiO2 microcapsules, attributed to a high load of healing species within the capsule (up to 87 wt %) and healing chemistry based on an accurate stoichiometric ratio of the photoinitiator and epoxy resin at 9/100. More importantly, healing chemistry based on a UV-triggered cationic polymerization mechanism is not sensitive to oxygen, extremely facilitating future embedment of this single SiO2 microcapsule in spacecraft coatings to achieve self-healing in a space environment with abundant UV radiation and oxygen.

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Section: Introductionmentioning

confidence: 99%

UV-Triggered Self-Healing of a Single Robust SiO₂ Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings

Guo

Jia

Tian

et al. 2016

ACS Appl. Mater. Interfaces

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“…Chipara et al reported the introduction of DCPD-filled polyurea formaldehyde microcapsules and FGGC Grubbs' catalyst into polyethylene oxide (PEO). [41] Again, an external mechanical stimulus breaks the capsules that start to leak DCPD. The presence of the catalyst triggers the polymerization process and the so formed poly(dicyclopentadiene) (PDCPD) heals the macroscopic fracture of PEO matrix.…”

Section: Microcapsulesmentioning

confidence: 99%

Exploiting Self‐Healing in Lithium Batteries: Strategies for Next‐Generation Energy Storage Devices

Mezzomo

Ferrara

Brugnetti

et al. 2020

Advanced Energy Materials

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An improved lifetime can be achieved by exploiting higher intrinsic durability of the materials, or by repairing the deteriorated component and restoring its original properties. Indeed, in the last years, several attempts to improve the lifetime of widespread devices (prosthetics, batteries, solar cells, lighting devices, etc.) were reported. [4-8] However, traditional techniques (welding, gluing, patching) need in situ application of fresh healing materials, and are not applicable to many modern complex devices that require disassembly and targeted operations well beyond the expertise of the final user. Moreover, repair by specialized personnel may be impossible or unsustainable from an economic point of view. To overcome these problems, a radically new strategy that can pave the way for more durable materials is emerging: the concept of selfhealing (SH). [9] This term refers to those smart materials that can automatically restore some, or all, of their functions after having suffered of an external damage that degraded their original properties. This usually has to do with autonomous recovery of physical cracks, but may include a wider range of features prolonging the lifetime of a material/ device, which space from anticorrosion to bactericidal properties. [10,11] By tailoring an appropriate response of the system, it becomes possible to design a material that can respond to various external perturbations and accommodate their eventual disturbance. The idea at the base of this approach is usually defined as biomimetic, since it takes inspiration from nature and mimic it in solving complex technological problems. [12] During the years, many different materials or technologies, naively depicted in Figure 1a, have taken inspiration from nature (as Velcro tape which mimics tiny hooks on bur fruits, naturally ventilated facades that mime termites' mounds, hydrophobic lotus-leaf coatings, and iridescent or adhesive surfaces respectively inspired by butterflies and geckos) and self-healing is not an exception. [13-15] In fact, in nature many organisms are capable of healing damages and of restoring their functionalities: skin, bones, plants, and other living systems can sense any failure and reconstruct the injured biological part which recovers its original functionalities. [16-18] Since these features lengthen the life of natural living beings, analog mechanisms can be exploited in artificial self-healing materials to benefit the Major improvements in stability and performance of batteries are still required for a more effective diffusion in industrial key sectors such as automotive and foldable electronics. An encouraging route resides in the implementation into energy storage devices of self-healing features, which can effectively oppose the deterioration upon cycling that is typical of these devices. In order to provide a comprehensive view of the topic, this Review first summarizes the main self-healing processes that have emerged in the multifaceted field of smart materials, classifying them on the basis of t...

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“…After the first successful self‐healing study with the DCPD/Grubbs catalyst system, several attempts were surfaced to create a feasible self‐healing systems for real structural application. Due to the several drawbacks of the DCPD/Grubbs such that Grubb's catalyst is rather expensive and degraded by the amine‐based catalyst of matrix, it is important to develop sustainable and cost‐effective self‐healing materials where Grubb's catalyst is replaced by a new catalyst system.…”

Section: Introductionmentioning

confidence: 99%

Semi‐intrinsic self‐healing performance of liquid‐cored microcapsules in epoxy matrix

2017

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We present an experimental study on the microcapsule-based semi-intrinsic selfhealing behavior of low viscosity epoxy resin used in Resin Transfer Molding (RTM) process. The microcapsules containing RTM epoxy resin are prepared using in situ polymerization of urea-formaldehyde. Single type of microcapsules with six different agitation rates is prepared, resulting in microcapsules with a mean diameter ranging from 52 to 202 μm. The thermal characteristics of each microcapsule batch are investigated using Differential Scanning Calorimetry (DSC) and Simultaneous Thermal Analysis (STA). In addition to thermal characterization tools, Fourier Transform Infrared Spectroscopy (FTIR) is also used as a qualitative technique to determine the composition of microcapsules. The mechanical properties of the selfhealing specimen such as Mode-I fracture toughness and flexure strength are assessed by a universal testing machine, and the obtained results are compared with the findings in literature. K E Y W O R D S in situ polymerization, microcapsules, mode-I fracture toughness, self-healing How to cite this article: Yilmaz C, Yildiz M, and Menceloglu Y. Semi-intrinsic self-healing performance of liquid-cored microcapsules in epoxy matrix. Adv

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Adding Autonomic Healing Capabilities to Polyethylene Oxide

Cited by 10 publications

References 29 publications

UV-Triggered Self-Healing of a Single Robust SiO₂ Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings

UV-Triggered Self-Healing of a Single Robust SiO₂ Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings

Exploiting Self‐Healing in Lithium Batteries: Strategies for Next‐Generation Energy Storage Devices

Semi‐intrinsic self‐healing performance of liquid‐cored microcapsules in epoxy matrix

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Adding Autonomic Healing Capabilities to Polyethylene Oxide

Cited by 10 publications

References 29 publications

UV-Triggered Self-Healing of a Single Robust SiO2 Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings

UV-Triggered Self-Healing of a Single Robust SiO2 Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings

Exploiting Self‐Healing in Lithium Batteries: Strategies for Next‐Generation Energy Storage Devices

Semi‐intrinsic self‐healing performance of liquid‐cored microcapsules in epoxy matrix

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Product

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UV-Triggered Self-Healing of a Single Robust SiO₂ Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings

UV-Triggered Self-Healing of a Single Robust SiO₂ Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings