Advanced search
1 file | 2.23 MB

Autonomous self-healing of epoxy thermosets with thiol-isocyanate chemistry

(2014) ADVANCED FUNCTIONAL MATERIALS. 24(35). p.5575-5583
Author
Organization
Abstract
Thiol-isocyanate chemistry, combined with a dual capsule strategy, is used for the development of extrinsic self-healing epoxy materials. It is shown that the amine groups present in the matrix both serve as a catalyst for the addition reaction between a thiol and an isocyanate and as a way to covalently link the healed network structure to the surrounding resin. The tapered double cantilever beam (TDCB) geometry is used for evaluating the recovery of the fracture toughness at room temperature after different healing times. Using manual injection of the healing agents into the crack, a healing efficiency up to 130% is obtained for the EPIKOTE 828/DETA epoxy material. On the other hand, when two types of microcapsules, one containing a tetrathiol reagent and the other a low toxic isocyanate reagent, are incorporated into this epoxy thermoset (20 wt%), a recovery of more than 50% is reached. The influence of parameters such as the amount and core content of the microcapsules on the healing efficiency is investigated. Furthermore, the thiol-isocyanate chemistry is also tested for an industrial cold-curing epoxy resin (RIM 135/RIMH 137).
Keywords
COMPLEXES, CATALYST, FRACTURE, POLYMERS, MICROENCAPSULATION, COMPOSITE, MICROCAPSULE-TOUGHENED EPOXY, HEALANT, SYSTEM, REPAIR

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 2.23 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Hillewaere, Xander, Roberto FA Teixeira, Le-Thu T Nguyen, Jose A Ramos, Hubert Rahier, and Filip Du Prez. 2014. “Autonomous Self-healing of Epoxy Thermosets with Thiol-isocyanate Chemistry.” Advanced Functional Materials 24 (35): 5575–5583.
APA
Hillewaere, X., Teixeira, R. F., Nguyen, L.-T. T., Ramos, J. A., Rahier, H., & Du Prez, F. (2014). Autonomous self-healing of epoxy thermosets with thiol-isocyanate chemistry. ADVANCED FUNCTIONAL MATERIALS, 24(35), 5575–5583.
Vancouver
1.
Hillewaere X, Teixeira RF, Nguyen L-TT, Ramos JA, Rahier H, Du Prez F. Autonomous self-healing of epoxy thermosets with thiol-isocyanate chemistry. ADVANCED FUNCTIONAL MATERIALS. 2014;24(35):5575–83.
MLA
Hillewaere, Xander, Roberto FA Teixeira, Le-Thu T Nguyen, et al. “Autonomous Self-healing of Epoxy Thermosets with Thiol-isocyanate Chemistry.” ADVANCED FUNCTIONAL MATERIALS 24.35 (2014): 5575–5583. Print.
@article{5941014,
  abstract     = {Thiol-isocyanate chemistry, combined with a dual capsule strategy, is used for the development of extrinsic self-healing epoxy materials. It is shown that the amine groups present in the matrix both serve as a catalyst for the addition reaction between a thiol and an isocyanate and as a way to covalently link the healed network structure to the surrounding resin. The tapered double cantilever beam (TDCB) geometry is used for evaluating the recovery of the fracture toughness at room temperature after different healing times. Using manual injection of the healing agents into the crack, a healing efficiency up to 130\% is obtained for the EPIKOTE 828/DETA epoxy material. On the other hand, when two types of microcapsules, one containing a tetrathiol reagent and the other a low toxic isocyanate reagent, are incorporated into this epoxy thermoset (20 wt\%), a recovery of more than 50\% is reached. The influence of parameters such as the amount and core content of the microcapsules on the healing efficiency is investigated. Furthermore, the thiol-isocyanate chemistry is also tested for an industrial cold-curing epoxy resin (RIM 135/RIMH 137).},
  author       = {Hillewaere, Xander and Teixeira, Roberto FA and Nguyen, Le-Thu T and Ramos, Jose A and Rahier, Hubert and Du Prez, Filip},
  issn         = {1616-301X},
  journal      = {ADVANCED FUNCTIONAL MATERIALS},
  language     = {eng},
  number       = {35},
  pages        = {5575--5583},
  title        = {Autonomous self-healing of epoxy thermosets with thiol-isocyanate chemistry},
  url          = {http://dx.doi.org/10.1002/adfm.201400580},
  volume       = {24},
  year         = {2014},
}

Altmetric
View in Altmetric
Web of Science
Times cited: