Fabrication of Anti-Counterfeiting Films by Dyeing Nanofibrillated cellulose (NFC) with Berberine.
Incorporation of planchettes and use of films that are capable of taking part in color-forming reactions are the common methods in fabricating security paper documents. In this paper, novel nanofibrillated cellulose (NFC)-based films with high performance in optical properties were developed for use in anti-counterfeiting applications. To enhance dyeability of NFC with eco-friendly cationic berberine, functional modification was carried out by in-situ polymerization along with grafting approach with acrylic acid (AA-g-NFC). The achievement of grafting was demonstrated with determination of grafting percentage and further characterized by Fourier transform infrared spectroscopy. Tensile strength impairment of AA-g-NFC films, which was accompanied with alteration of crystallinity and partially changing the structure of cellulose I to cellulose II, was demonstrated by X-ray diffraction analysis. The variations of dyeing reaction time and temperature altered color strength of NFC due to d
Added 2026-04-21