Fluorescent self-healing waterborne polyurethane
A recently cunducted study focuses on a fluorescent polyurethane based on naphthalimide derivatives and its application in anti-counterfeiting.
Waterborne polyurethane with high rigidity and self-healing properties plays an important role in polymer dyes and fluorescent anti-counterfeiting. In a new paper, a naphthalimide derivative BHHNA-AM with high fluorescence and strong intermolecular hydrogen bonds was prepared and used as chain extender to synthesise a fluorescent waterborne polyurethane (PUAM).
Anti-counterfeiting ink
Intriguingly, the presence of highly rigid conjugate plane in molecules and strong non-covalent interaction between main chain and side chain amide group afforded PUAM film an autonomous self-healability at room temperature, the self-healing rate of scratched PUAM could be restored from 47.73% to 94.62% within 9 h, which could be widely used as thermoplastic adhesive. In addition, PUAM emulsion could be used as anti-counterfeiting ink printed on different substrates. After 14 days of UV irradiation and heat treatment, the colour difference of printed products was less than 3.5, indicating excellent light resistance.
The study has been published in Progress in Organic Coatings, Volume 167, June 2022.
