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Preparation and Characterization of Self-healing Coatings Using Inhibitor Loaded Polymeric Nanocontainers

Pirhady Tavandashti, Nahid | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47429 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Ghorbani, Mohammad; Shojaei, Akbar
  7. Abstract:
  8. The aim of this work was to synthesize hollow polyaniline nanostructures to be used as pH responsive nanoreservoirs for corrosion inhibitors in self-healing cotings. First, homogeneous and fairly monosized microspherers of polyaniline with nanosized shell was synthesized using a simple soft template method with β-naphthalene sulfonic acid (β-NSA) as both the surfactant and dopant, and ammonium persulfate (APS) as the oxidant at 2-5◦C. The morphology of PANI-NSA was successfully controlled from nanotubes to microsphere, by changing the synthesis conditions (i.e. pH, the concentration of surfactant and monomer, temperature, etc). Then, the nanostructured hollow PANI microspheres were applied for encapsulation of organic corrosion inhibitor 2-Mercaptobenzothiazole (MBT). The pH responsive release of MBT from the capsules is observed at higher pHs (~11), which makes them good candidates for incorporation into corrosion protective coatings. The embedding of MBT loaded PANI capsules in anticorrosive epoxy ester coating on AA2024-T3 substrate allows for a self-healing effect to be obtained during the corrosion process. The superior corrosion protection of this active system in comparison to the pure epoxy ester coating was observed by the Scanning Vibrating Electrode Technique (SVET), and Electrochemical Impedance Spectroscopy (EIS). The self-healing ability occurs due to release of encapsulated corrosion inhibitor in response to a local increase of pH caused by the corrosion process. The results highlight the synergistic effect of MBT corrosion inhibitor together with polyaniline capsules acting as smart additives for organic coatings
  9. Keywords:
  10. Corrosion ; Encapsulation ; Polyaniline ; Self Healing System ; PH-triggered Release

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