In-situ synthesis of hydrophobic SiO2-PMMA composite for surface protective coatings: Experimental and quantum chemical analysis

A. Madhan Kumar, Sanjay S. Latthe, P. Sudhagar, I. B. Obot, Zuhair M. Gasem*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (SciVal)

Abstract

The extreme commercial demand for polymer based protective coatings has triggered in a recent propagation of methods expected to impart high corrosion resistance and numerous such methods involve wet-based processing of hydrophobic polymers. This work explores the feasibility of hydrophobic SiO2- poly (methyl methacrylate) (PMMA) coatings towards surface protecting applications where the undesired corrosion issue takes place on the host surface. Hydrophobic SiO2-PMMA composite coating is achieved on stainless steel (SS) substrate for different time duration of dip coating using pre-synthesized SiO2-PMMA sol by sol-gel method. Coating duration of SiO2-PMMA influences PMMA species filling at SiO2 microstructures which relay on wettability behaviour of SS surface switch from Wenzel state to Cassie-Baxter state. The underlying mechanism of water repellence on SiO2-PMMA composite surface is examined using quantum chemical calculations. It clearly demonstrates that the high dipole moment of SiO2-MMA pair (5.63 Debye), than H2O (1.85 Debye) beneficially displaces water from steel and perhaps enhances the physical adsorption between steel greatly improved the corrosion resistance.

Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalPolymer
Volume77
DOIs
Publication statusPublished - 23 Oct 2015

Keywords

  • Polymer-matrix composites (PMCs)
  • Quantum chemical modelling
  • Surface protection

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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