Self-healing isocyanate microcapsules for efficient restoration of fracture damage of polyurethane and epoxy resins

Wang, Xinmeng; Jiang, Shuai; An, Na; Li, Xudong; Li, Qifeng; Wang, Junwei; Zhao, Yang; Kang, Maoqing

doi:10.1007/s10853-018-03236-3

Cited by 50 publications

(26 citation statements)

References 57 publications

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“…Their properties are given in Table 1. These three solvents have been used as plasticizers for a variety of polymers and are all liquid at room temperature [31][32][33][34]. Propylene carbonate, (PC) is a small molecule which is often used in the vinyl polymer industry and consumer products such as adhesives, paints and cosmetics and is soluble in water [35,36].…”

Section: Resultsmentioning

confidence: 99%

ADMET polymerization in affordable, commercially available, high boiling solvents

et al. 2020

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Acyclic diene metathesis polymerization is a powerful technique for creating polymers with precise placement of functional groups. However, due to the need to use high vacuum or other methods to remove the volatile ethylene byproduct and drive the reaction forward, traditional solvents are not feasible. Here we demonstrate the use of three cheap, commercially available solvents as a medium for ADMET polymerizations: propylene carbonate, diethyl phthalate, and dioctyl phthalate. We have shown that by using these solvents, we can increase the molecular weights of ADMET-synthesized polyethylene by over 450% as compared to the bulk polymerization as well as reduce polymerization times from 72 h down to 24 and polymerize challenging, solid monomers.

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Section: Resultsmentioning

confidence: 99%

ADMET polymerization in affordable, commercially available, high boiling solvents

et al. 2020

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“…During microencapsulation, the repair agents are encapsulated as core materials, and the main function of the wall materials is to protect the core materials. The commonly used microcapsules wall materials are mainly polymer or polymer/inorganic hybrid walls, such as poly‐(urea formaldehyde), [ 23,24 ] polysulfone (PSF), [ 22 ] polyurethane (PU), [ 25 ] polymethyl methacrylate, [ 26,27 ] PSF/SiO 2 , [ 28 ] polyurea/SiO 2 , [ 29 ] and PU/SiO 2 . [ 30,31 ]…”

Section: Introductionmentioning

confidence: 99%

Preparation of Tung Oil‐Loaded PU/PANI Microcapsules and Synergetic Anti‐Corrosion Properties of Self‐Healing Epoxy Coatings

Feng

Cui

Zhang

et al. 2020

Macro Materials & Eng

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Tung oil is used as a catalyst‐free repair agent. Tung oil‐loaded polyurethane (PU) microcapsules are prepared by interfacial polymerization in a SiO2‐stabilized Pickering emulsion system, polyaniline (PANI) is deposited in situ on the PU microcapsule surface, and tung oil‐loaded PU/PANI double‐layer shell microcapsules are obtained. Synthesized PU/PANI microcapsules showed the characteristic dark‐green color of conductive PANI. The average particle size is 31.1 ± 8.1 µm and the core content is 45.1 ± 4.3 wt%. The microcapsules have a good thermal stability, and the chemical structure of the PU/PANI wall and tung oil core is confirmed by Fourier transform infrared analysis. Self‐healing anti‐corrosion coatings are prepared by adding 10 wt% microcapsules into epoxy resin. The corrosion resistance properties of the self‐healing coating are evaluated by immersing scratched coatings in 10 wt% NaCl solution for 15 days. The self‐healing coating with 10 wt% tung oil‐loaded PU/PANI microcapsules have the best anti‐corrosion property, and slight corrosion do not occur until 15 days after immersion in salt solution. The self‐healing and anti‐corrosion mechanism are revealed. The tung oil core and the PANI wall of microcapsules contributed synergistically to the excellent self‐healing and anti‐corrosion properties of the coating through the formation of self‐healing films and passivation layers.

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“…Microcapsule technology is attracting extensive interest from researchers due to their new application in phase-change, 1,2 sustained release, 3 –5 and self-healing fields. 6 –11 A wide variety of preparation techniques of microcapsules have been designed according to their raw material characteristics and application requirements. 12 –15 Self-healing microcapsules can autonomously repair surface cracks as well as internal micro-cracks in the presence of the catalyst and provide great potential for enhancing the durability and reliability of various engineering materials and composites.…”

Section: Introductionmentioning

confidence: 99%

Optimized synthesis of isocyanate microcapsules for self-healing application in epoxy composites

Sun

Wang

Dong

et al. 2020

High Performance Polymers

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Microcapsules containing isophorone diisocyanate were fabricated in oil-in-water emulsion. The emulsification effect of different emulsifiers during the capsule synthesis was systematically investigated by optical microscope. Three kinds of shell materials were discussed to obtain the high core content, smooth-surfaced, and robust capsule by scanning electronic microscope and Fourier transform infrared spectroscopy. Self-healing performance of corresponding self-healing epoxy composites was fully evaluated by accelerated corrosion test and mechanical test. The results demonstrated that high core content and smooth-surfaced capsules with dense composite shell could be synthesized in polyvinyl alcohol emulsion, and the core content of the optimized capsules was determined as 71.3–84.6 wt% at the capsule size from 35 µm to 154 µm. In addition, the optimized capsules had good processing properties and the corresponding self-healing epoxy composites exhibited excellent core release and self-healing performance.

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Self-healing isocyanate microcapsules for efficient restoration of fracture damage of polyurethane and epoxy resins

Cited by 50 publications

References 57 publications

ADMET polymerization in affordable, commercially available, high boiling solvents

ADMET polymerization in affordable, commercially available, high boiling solvents

Preparation of Tung Oil‐Loaded PU/PANI Microcapsules and Synergetic Anti‐Corrosion Properties of Self‐Healing Epoxy Coatings

Optimized synthesis of isocyanate microcapsules for self-healing application in epoxy composites

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