Effect of Amount of Ethyl Cellulose Microcapsules on the Corrosion Resistance of Polyurethane-based Self-healing Coating

Document Type : Research Article


1 Department of Materials Engineering, Isfahan University of Technology, Isfahan, I.R. IRAN

2 National Iranian Oil Products Distribution Company, Tehran, I.R. IRAN


In this study, Ethyl Cellulose (EC) microcapsules containing linseed oil have been prepared by emulsion-solvent evaporation method. The prepared microcapsules were then embedded in polyurethane (PU) paint to develop self-healing coatings and applied on steel substrate. In order to determine the effect of amount of EC microcapsules containing linseed oil on self-healing performance of the produced coating, PU-based coatings with various amount of prepared microcapsules were applied on plain carbon steel via spray method. The characterization of microcapsules core material was investigated by FT-IR spectroscopy and their shape and size were determined by Scanning Electron Microscope (SEM). The average diameter of microcapsules was obtained around 300 microns. The self-healing performance and corrosion resistance of the coatings were evaluated on samples with initial scratches on them, using Linear Polarization (LP) and Electrochemical Impedance Spectroscopy (EIS) tests. Results obtained revealed that, coatings containing microcapsules showed self-healing performance. Moreover, corrosion resistance of the self-healing coatings increased with increasing amount of EC microcapsules containing linseed oil and self-healing properties improved as well.


Main Subjects

 [1] Hatami Boura S., Peikari M., Ashrafi A., Samazadeh M., Self-healing Ability and Adhesion Strength of Capsule Embedded Coatings-Micro and Nano Sized Capsules Containing Linseed Oil, Progress in Organic Coatings, 75: 292-300 (2012).
[2] Mirabedini S.M., Dutil I., Farnood R.R., Preparation and Characterization of Ethyl Cellulose-Based Core–Shell Microcapsules Containing Plant Oils, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 394: 74-84 (2012).
[3] Eshaghi H., Mirabedini S. M., Imani M., Farnood R., Preparation and characterization of Pre-Silane Modified Ethylcellulose-Based Microcapsules Containing Linseed Oil, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 447: 71-80 (2014).
[4] Samadzadeh M., Hatami Boura S., Peikari M., Kasiriha S., Ashrafi A., A Review on Self-Healing Coatings  Based on Micro/Nanocapsules, Progress in Organic Coatings, 68: 159-164 (2010).
[5] Blaiszik B., Caruso M., Mcllroy D., Moore J., White S., Sottos N., Microcapsules Filled with Reactive Solutions for Self-Healing Materials, Polymer , 50: 990-997 (2009).
[6] Leping L., Wei Z., Hongmei W., Yang Z., Wunjun L., Preparation and Characterization of Microcapsule Containing Epoxy Resin and Its Self-Healing Performance of Anticorrosion Covering Material, Chinese Science Bulletin, 56: 439-443 (2011).
[8] Nesterova T., Johnsen K., Pendersen L., Kiil S., Microcapsule-based Self-Healing Anticorrosive Coatings: Capsule Size, Coating Formulation, and Exposure Testing, Progress in Organic Coatings, 75: 309-318 (2012).
[9] Rui W., Mao Q., Liu Q., Ma X., Cui S., Wang Y., The Preparation and Research of Microcapsules in Self-healing Coatings, Advanced Materials Research, 800: 471-475 (2013).
[10] Noh H., Lee J., Microencapsulation of Self-Healing Agents Containing a Fluorescent Dye, Express Polymer Letters, 7: 88-94 (2013).
[11] Sondari D., Septevani A., Randy A., Triwulandari E., Polyurethane Microcapsule with Glycerol as the Polyol Component for Encapsulated Self-Healing Agent, International Journal of Engineering and Technology, 2: 466-471 (2010).
[12] Liu X., Zhang H., Wang J., Wang Z., Wang S., Preparation of Epoxy Microcapsule Based Self-Healing Coatings and  Their Behavior, Surface & Coatings Technology , 206: 4976-4980 (2012).
[13] Mcllory D., Blaiszik B., Caruso M., White S., Moore N., Scottos N., Microencapsulation of a Reactive Liquid-Phase Amine for Self-Healing Epoxy Composites, Macromolecules, 43: 1855–1859, (2010).
[14] Feczko T., Varga O., Kovacs M., Vidoczy T., Voncina B., Preparation and Characterization of Photochromic Poly(Methyl Methacrylate) and Ethyl Cellulose Nanocapsules Containing a Spirooxazine Dye, Journal of Photochemistry and Photobiology A: Chemistry, 222: 293-298 (2011).
[15] Murtaza Gh., Ethylcellulose Microparticles: A Review, Acta Poloniae Pharmaceutica-Drug Research, 69: 11-22 (2012).
[16] Sheorey D., Sesha Sai M., Dorle K., A New Technique for the Encapsulation of Water Insoluble Drugs Using EthylCellulose, Journal Of Microencapsulation, 8: 359-368 (1991).
[17] Badulescu R., Vivod V., Jausovec D., Voncina B., Treatment of Cotton Fabrics with Ethyl Cellulose Microcapsules, Woodhead, 75: 226-235 (2010).
[19] Sappidi S., Thadkala K., Kota J., Aukunuru J., Preparation and Characterization of Ethyl Cellulose Microspheres Encapsulating Metformin Hydrochloride and Glipizide, Der Pharmacia Letter, 6: 213-226 (2014).
[20] Sudhamani T., Noveenkumar K., Preparation and Evaluation of Ethyl Cellulose Microspheres of Ibuprofen for Sustained Drug Delivery, International Journal of Pharma Research and Development, 2: 119-125 (2010).
[21] Johannes Fickert., “Nanocapsules for Self-healing Material”, Max-Planck-Institut für Polymerforschung Mainz, Germany, (2013).