Publication detail

Self-healing epoxy coating synthesis by embedment of metal 2-methyl imidazole and acetylacetonate complexes with microcapsules

Ullah, H., Qureshi, K.S., Khan, U., Zaffar, M., Yang, Y.J., Rabat, N.E., Khan, M.I., Saqib, S., Mukhtar, A., Ullah, S., Mubashir, M., Bokhari, A., Chai, W.S., Chew, K.W., Show, P.L.

Original Title

Self-healing epoxy coating synthesis by embedment of metal 2-methyl imidazole and acetylacetonate complexes with microcapsules

Type

journal article in Web of Science

Language

English

Original Abstract

The restoration of mechanical properties is desired for creating the self-healing coatings with no corrosion capabilities. The encapsulation of epoxy resins is limited by various factors in urea and melamine formaldehyde microcapsules. An improved method was developed, where epoxy resin was encapsulated by individual wrapping of poly(melamine-formaldehyde) and poly(urea-formaldehyde) shell around emulsified epoxy droplets via oil-in-water emulsion polymerization method. The synthesized materials were characterized analytically. The curing of the epoxy was achieved by adding the [Ni/Co(2-MI)(6)]center dot 2NO(3) as a latent hardener and iron acetylacetonate [Fe(acac)(3)] as a latent accelerator. Isothermal and non-isothermal differential scanning calorimetric analysis revealed lower curing temperature (T-onset = 116 degrees C) and lower activation energies (Ea approximate to 69-75 kJ/mol). The addition of microcapsules and complexes did not adversely alter the flexural strength and flexural modulus of the epoxy coatings. The adhesion strength of neat coating decreased from 6310.8 +/- 31 to 4720.9 +/- 60 kPa and percent healing increased from 50.83 to 67.45% in the presence of acetylacetonate complex at 10 wt% of microcapsules.

Keywords

Adhesion strength; Epoxy resins; Flexural strength; Melamine-urea-formaldehyde; Metal imidazole complex; Self-healing

Authors

Ullah, H., Qureshi, K.S., Khan, U., Zaffar, M., Yang, Y.J., Rabat, N.E., Khan, M.I., Saqib, S., Mukhtar, A., Ullah, S., Mubashir, M., Bokhari, A., Chai, W.S., Chew, K.W., Show, P.L.

Released

1. 12. 2021

Publisher

Elsevier Ltd.

Location

PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

ISBN

0045-6535

Periodical

CHEMOSPHERE

Number

285

State

United Kingdom of Great Britain and Northern Ireland

Pages from

131492

Pages to

131492

Pages count

12

URL

https://www.sciencedirect.com/science/article/abs/pii/S0045653521019640?via%3Dihub

BibTex

@article{BUT172195,
  author="Syed Awais Ali Shah {Bokhari}",
  title="Self-healing epoxy coating synthesis by embedment of metal 2-methyl imidazole and acetylacetonate complexes with microcapsules",
  journal="CHEMOSPHERE",
  year="2021",
  number="285",
  pages="131492--131492",
  doi="10.1016/j.chemosphere.2021.131492",
  issn="0045-6535",
  url="https://www.sciencedirect.com/science/article/abs/pii/S0045653521019640?via%3Dihub"
}