Development of low environmental impact protective coatings based on a furan resin and cellulose nanocrystals

[Display omitted] •Low environmental impact coatings based on furan/nanocellulose (CNC) were evaluated.•CNC did not significantly affect the thermal degradation behavior of the furan resin.•Nanocomposites showed excellent interfacial adhesion to aluminum substrate.•CNC enhanced coatings’ mechanical...

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Bibliographic Details
Published in:Progress in organic coatings 2019-08, Vol.133, p.229-236
Main Authors: Asaro, L., Seoane, I.T., Fasce, L.A., Cyras, V.P., Manfredi, L.B.
Format: Article
Language:English
Subjects:
Aluminum
Cellulose
Cellulose nanocrystals
Cellulosic resins
Coating
Contact angle
Crosslinking
Environmental impact
Furan resin
Furan resins
Furfural
Mechanical properties
Modulus of elasticity
Nanocomposites
Nanocrystals
Nanoindentation
Organic chemistry
Performance degradation
Protective coatings
Substrates
Thermal degradation
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Summary:[Display omitted] •Low environmental impact coatings based on furan/nanocellulose (CNC) were evaluated.•CNC did not significantly affect the thermal degradation behavior of the furan resin.•Nanocomposites showed excellent interfacial adhesion to aluminum substrate.•CNC enhanced coatings’ mechanical resistance to permanent damage.•Cellulose nanocrystals hindered the furan resin reticulation. A furan resin, synthesized from furfural and phenol, was previously proposed as a less environmental impact alternative to traditional phenolics’ coatings to protect aluminum. In this work, the furan resin was modified with 10 and 20%wt of prepared cellulose nanocrystals (CNC), a biobased nanoreinforcement. Several techniques such as AFM, FTIR, DMA, TGA, XRD, nanoindentation experiments and contact angle measurements were applied to characterize CNC, coatings mechanical performance, materials thermal degradation behavior and chemical structure. It was found that all materials show an excellent interfacial adhesion with the aluminum substrate. CNC incorporation enhances coatings’ mechanical resistance to permanent damage and unexpectedly reduces the elastic modulus. This is because CNC affects the polymerization hindering furan matrix crosslinking. CNC addition slightly accelerates the thermal degradation rate in the overall degradation zone of furan resin keeping the same degradation mechanism and the formation of the protective char.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2019.04.035