Abstract
In this work, the development and application of multicomponents obtained from recycled polyethylene terephthalate (r-PET) waste and monotropic liquid crystals as anticorrosion coatings are reported. The r-PET raw material was alcoholyzed and reproduced as a thermoplastic polyester elastomer (TPEE) with different amounts (n%, n = 0, 1, 3, and 5) of 1,6-hexanediamine (HDA). Then, a fluorine-containing liquid crystal (4-cyano-3-fluorophenyl 4-ethylbenzoate (4CFE)) was incorporated into the TPEE mixture via solvent blending to modify and enhance the water resistance. The adhesion behavior of the coating on glass and iron substrates was evaluated by cross-cut tests and immersion tests in aqueous NaCl. In the corrosion resistance measurements, all of the coating samples fabricated with 10 ± 1 mm thickness were less active toward electrochemical corrosion (PEF% > 99%) than the bare iron plate, indicating that our work provided better protection against corrosion of the iron plate.
Highlights
Metal corrosion is a common problem that is responsible for serious financial losses and even disasters
To inhibit or prevent corrosion, film coating is a useful approach to forming a stable protective layer on metallic surfaces, e.g., by using graphene [1,2,3], inert metal [4,5], or discotic columnar liquid crystals (DCLCs) [6,7]
If the coating substrate were obtained from a postconsumer commingled polymer (PCCP), it would represent a good solution to resolve the problem of waste pollution
Summary
Metal corrosion is a common problem that is responsible for serious financial losses and even disasters. The framework of the recycled polymer was changed after numerous processing cycles, resulting in poor mechanical properties compared to the original polymer. It seems that blending is the simplest and most convenient strategy to overcome these problems, because waste plastics are converted into composites during blending [14]. Various approaches, including physical/chemical recycled PET (r-PET), provide a useful and environmentally friendly method to produce a value-added product for reuse in anticorrosion coating materials. This blend provides a new strategy to prevent the phenomenon of metal corrosion but a new concept for the reuse of r-PET
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