Crosslinked polybenzoxazine coatings with hierarchical surface structures from a biomimicking process exhibiting high robustness and anticorrosion performance

• Published in: Polymer (Guilford) Vol. 155; pp. 168 - 176
• Main Authors: Zachariah, Susan, Chuo, Tsai-Wei, Liu, Ying-Ling
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 24.10.2018; Elsevier BV
• Subjects: Adhesive strength; Anticorrosion; Benzoxazine; Biomimicking; Coating effects; Coatings; Corrosion prevention; Corrosion resistance; Crosslinked polymeric coatings; Crosslinking; Crosslinking polymerization; Efficiency; Fabrication; Hydrophobicity; Leaves; Microstructure; Molecular structure; Polybenzoxazines; Polymer chemistry; Protective coatings; Structural hierarchy; Substrates; Surface structure; Biomimicking; Benzoxazine; Anticorrosion; Crosslinked polymeric coatings
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2018.09.039

In this work, crosslinkable polybenzoxazine (PBz), which exhibits high surface-covering ability, strong adhesion to metal substrates, and a dense crosslinked structure resistant to corrosion molecule permeation, has been demonstrated as an effective agent for single-component anticorrosion application. Plain crosslinked PBz-based anticorrosion coating shows a protection efficiency of 96.3%. Hierarchical surface structures and hydrophobicity have been introduced to the anticorrosion coatings through a biomimicking process using lotus leaves as templates, and so as to increase the protection efficiency to an extremely high level of 99.93%. Crosslinked PBz coatings with a hierarchical surface structure and surface hydrophobicity are highly effective for anticorrosion application. Moreover, biomimicking anticorrosion coatings have also been prepared with xanthosoma sagittifolium leaves to probe the template effect on the anticorrosion efficiency of the biomimicking coatings. Lotus leaves, rather than xanthosoma sagittifolium leaves, are the better choice for fabrication of the biomimicked anticorrosion coatings. [Display omitted] •Crosslinked polybenzoxazine coatings with hierarchical surface structures are prepared.•Biomimicking processes are performed using lotus leaves and xanthosoma sagittifolium leaves based templates.•A robust and highly efficient single-component anticorrosion coating is demonstrated with polybenzoxazine.•The anticorrosion coating shows an extremely high protection efficiency of 99.93%.