Vapor-based synthesis of bilayer anti-corrosion polymer coatings with excellent barrier property and superhydrophobicity
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Bilayer polymer coatings that consisted of a highly cross-linked polyethylene glycol diacrylate (PEGDA) bottom layer and nanostructured poly(perfluorodecyl acrylate-co-ethylene glycol diacrylate) (P(PFDA-co-EGDA)) top layer were synthesized via a single-step vapor deposition method. The vapor-synthesized PEGDA single-layer film exhibits excellent barrier performance with oxygen permeability of 0.0066 Barrer, which is more than 16-fold smaller than that of commercial PET packaging film. The P(PFDA-co-EGDA) layer, grown on top of PEGDA, shows conical array structure. Such nanostructure combined with the low surface energy of PFDA moiety enables superhydrophobicity of the coating with water contact angle of 159°. The achieved superhydrophobicity is stable over more than 168 h upon immersion in NaCl solution. The bilayer coating structure imparts a synergistic effect to minimize both the diffusion of water and ions and permeation of oxygen, resulting in a significant drop of corrosion rate to 2.19 × 10−7 mm year−1, a more than 104-fold decrease compared to bare copper.
We thank Prof. Haichao Zhao and Ms. Shihui Qiu for the assistance with the electrochemical tests. We are grateful for the funding support from the National Natural Science Foundation of China (51873093), Technology Foundation for Selected Overseas Chinese Scholars by Ministry of Personnel of China, and Ningbo “3315” Innovation Initiative. This work was also sponsored by K. C. Wong Magna Fund in Ningbo University.
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