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Tailoring a variety of self-stratifying patterns in a light-curable coating on the substrates with different surface free energies

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dc.contributor.authorAbdollahi Baghban, S.
dc.contributor.authorEbrahimi, M.
dc.contributor.authorKhorasani, M.
dc.contributor.authorBagheri Khoulenjani, S.
dc.date.issued2022
dc.descriptionData source: Supplementary material, https://doi.org/10.1016/j.porgcoat.2022.107023
dc.description.abstractSelf-stratification is an ecological method that leads to the stratified structures by one-layer application to reduce solvent emissions and energy consumption. Despite the great importance of the effect of surface properties on the self-stratification phenomena, the influence of the substrate type has not been examined in self-stratifying light-curing systems. This study aimed to design dissimilar self-stratifying patterns by using several substrates namely glass, steel, Al, polyethylene, polyethylene terephthalate, polyvinyl chloride, polypropylene, polystyrene, with different surface free energies (γ) (high γ: 59–63, medium: 41–43 and low: 31–34 mN.m−1) based on incompatible bio-renewable light-curable materials including methacrylated gelatin (GelMA) and acrylated epoxidized soybean oil diluted by the acrylated glycidyl neodecanoate (AESO-GN). To this, the impact of the essential substrate characteristics including γ and roughness on the self-stratifying behavior and other properties of the achieved coatings were studied by using SEM-EDX, contact angle (CA), FTIR-ATR, and the other conventional coating analyses. The results disclosed that the Funke theory had the potential to predict the self-stratifying behavior of the abovementioned light-curing coatings on a variety of substrates. Moreover, it was understood that self-stratification dealt with the γ of the substrate, so that the application and light-curing of coatings on the substrates with high and medium γ resulted in a bi-layered and a gradient concentration self-stratified structures, respectively. Furthermore, it was revealed that applying this coating on substrates with low γ led to an incoherent structure. Consequently, the know-how for tailoring several self-stratified coatings with different gloss values (54–88 at 60°), pendulum hardness (43–76), MEK double rub resistance (25–45)), glass transition temperature (44–72 °C), swelling degree (20–29 %), gel fraction (74–89 %), water CA (61–86°), and cross-cut adhesion (0B–4B) was realized. Besides, the findings demonstrated that increasing the surface roughness of steel substrate intensified the self-stratification. Accordingly, the coating-substrate interface is of great importance for self-stratification as its characteristics will identify the stratification pattern. In addition, it was observed that appropriate bi-layered coatings could not be attained by the consecutive application and curing of GelMA and AESO-GN layers. Consequently, this attempt provided beneficial insight into the design of green coatings via an ecological fast-curing methodology.
dc.identifier.citationProgress in Organic Coatings, 2022; 171(107023):1-14
dc.identifier.doi10.1016/j.porgcoat.2022.107023
dc.identifier.issn0300-9440
dc.identifier.issn1873-331X
dc.identifier.orcidBagheri Khoulenjani, S. [0000-0002-0478-0679]
dc.identifier.urihttps://hdl.handle.net/11541.2/41793
dc.language.isoen
dc.publisherElsevier BV
dc.rightsCopyright 2022 Elsevier B.V. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.porgcoat.2022.107023
dc.subjectself-stratifying coatings
dc.subjectGelMA
dc.subjectacrylated epoxidized soybean oil (AESO)
dc.subjectsurface free energy
dc.subjectsubstrate
dc.subjectlight-curing
dc.titleTailoring a variety of self-stratifying patterns in a light-curable coating on the substrates with different surface free energies
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9916946125201831

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