%K Activation energy; Bending strength; Bond strength (materials); Corrosion resistant coatings; Curing; Emulsification; Epoxy resins; Formaldehyde; Iron compounds; Isotherms; Metabolism; Microstructure; Resins; Synthesis (chemical); Urea; Urea formaldehyde resins, Acetylacetonate complexes; Epoxy; Epoxy coatings; Imidazole complexes; Melamine urea formaldehydes; Melamine-Formaldehyde; Metal imidazole complex; Microcapsules; Self-healing; Urea formaldehyde, Self-healing materials, acetone; cobalt; epoxy resin; formaldehyde; gum arabic; imidazole; imidazole derivative; melamine; nickel; triethanolamine; urea; water oil cream; acetyl acetonate; alkanone; hydroxybutyric acid; imidazole derivative, adhesion; coating; encapsulation; formaldehyde; mechanical property, absorption; Article; calorimetry; coating (procedure); controlled study; enthalpy; entropy; flexural strength; microcapsule; polymerization; room temperature; scanning electron microscopy; synthesis; thermal analysis; microcapsule, Capsules; Epoxy Resins; Hydroxybutyrates; Imidazoles; Pentanones
%X 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)6.2NO3 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 (Tonset = 116 °C) and lower activation energies (Ea � 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. © 2021 Elsevier Ltd
%L scholars14217
%A H. Ullah
%A K.S. Qureshi
%A U. Khan
%A M. Zaffar
%A Y.J. Yang
%A N.E. Rabat
%A M.I. Khan
%A S. Saqib
%A A. Mukhtar
%A S. Ullah
%A M. Mubashir
%A A. Bokhari
%A W.S. Chai
%A K.W. Chew
%A P.L. Show
%I Elsevier Ltd
%J Chemosphere
%R 10.1016/j.chemosphere.2021.131492
%D 2021
%O cited By 5
%V 285
%T Self-healing epoxy coating synthesis by embedment of metal 2-methyl imidazole and acetylacetonate complexes with microcapsules