Synthesis of robust polyaniline microcapsules via UV-initiated emulsion polymerization for self-healing and anti-corrosion coating

A novel kind of robust PANI microcapsules were prepared via a one-pot photopolymerization and interfacial aniline polymerization. In our strategy, lignosulfonate was employed as emulsifier to stabilize oil-in-water emulsion, in which the oil phase was composed of self-healing agent (tung oil), photo...

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Bibliographic Details
Published in:Progress in organic coatings 2022-01, Vol.162, p.106592, Article 106592
Main Authors: Wu, Kaiyun, Gui, Taijiang, Dong, Jiahao, Luo, Jing, Liu, Ren
Format: Article
Language:English
Subjects:
Aniline
Anti-corrosion
Coating
Coatings
Corrosion
Corrosion prevention
Corrosion products
Crosslinking
Emulsion polymerization
Lignosulfonates
Microcapsules
Monomers
Photopolymerization
Polyaniline
Polyanilines
Robustness
Salt spray tests
Scratch tests
Self healing materials
Self-healing
Substrates
Ultraviolet radiation
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Summary:A novel kind of robust PANI microcapsules were prepared via a one-pot photopolymerization and interfacial aniline polymerization. In our strategy, lignosulfonate was employed as emulsifier to stabilize oil-in-water emulsion, in which the oil phase was composed of self-healing agent (tung oil), photo-crosslinkable acrylic monomer and crosslinker. Under UV light, the acrylic monomer and crosslinker were photo-polymerized and formed a cross-linked polyacrylic shell, endowing sufficient robustness to the microcapsules. Aniline was subsequently added to the water phase and polymerized at the oil-water interface, which converted to a second shell and endowed anticorrosion property. FTIR, TGA and SEM tests proved the successful preparation of PANI microcapsules, and the loading of tung oil in the microcapsules reached 55.1 wt%. These microcapsules could keep integrity and be uniformly dispersed in water-based epoxy coating. The incorporation of PANI microcapsules in the coating not only imparted self-healing properties to the coatings, but also greatly enhanced its anticorrosion performance. The scratch test indicated that the coatings containing only 5 wt% microcapsules could autonomously heal a scratch with 50 μm in width. In addition, the healed coatings with the microcapsules showed almost no corrosion products after 500 h salt spray test (SST), while for the scratched neat epoxy coating, a large area of coating peeled from the substrate after only 200 h SST. The remarkably enhanced corrosion protection capability was owing to the closure of the scratch by the self-healing effect and the inhibition efficiency of PANI. •A novel kind of robust PANI microcapsules were prepared.•The shell and core material of microcapsule provide different property respectively.•The coating exhibits excellent self-healing and anti-corrosion performance.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2021.106592