Abstract
A novel aqueous coating based on Diels-Alder (DA) chemistry is presented. In such material, three peculiar features, namely optical transparency, self-healing ability and water-reducibility, are integrated. The thermal-reversibility of the polymer network is achieved by crosslinking a random terpolymer of furfuryl methacrylate (FMA), methacrylic acid (MAA) and 2-ethyl-hexyl methacrylate (EHMA) with an aliphatic bismaleimide through a DA reaction between furan and maleimide moieties. The effectiveness of the thermal reversibility is proved by differential scanning calorimetry, solubility tests and multiple scratch-repair cycles. The adoption of an aliphatic bismaleimide as crosslinker imparts a great transparency and absence of color to the thermally responsive coating as assessed by UV–vis spectroscopy. Thanks to the presence of the carboxyl moiety in the MAA units, dispersion in water after neutralization is enabled, ensuring the production of a water-reducible coating systems with added functionalities.
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