Dynamic colorimetric properties of mixed thermochromic printing inks (CROSBI ID 173582)
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Podaci o odgovornosti
Kulčar, Rahela ; Friškovec, Mojca ; Klanjšek Gunde, Marta ; Knešaurek, Nina
engleski
Dynamic colorimetric properties of mixed thermochromic printing inks
Leuco dye-based thermochromic inks reversibly change from coloured to discoloured state in a defined, more or less wide, temperature region. Inside this region the colour of a sample depends on the temperature and thermal history, which is known as the hysteresis effect. The colour of such a sample as a function of temperature has the shape of a hysteresis loop. Commercially available thermochromic inks have different loops, narrow or broad, and their shapes range from approximately symmetric to highly asymmetric. These properties are also important in mixtures. The hysteresis loop of a mixture reveals its binary nature if the individual pure inks have well separated hysteresis. When inks with close-separated loops, i.e. with similar activation temperatures, are mixed together, the loop of the mixture fuses together into an apparently single loop. Our research shows that some of their dynamic colour properties could be predicted in advance. However, optic and colorimetric properties of mixtures are not additive.
thermochromic inks; colorimetric properties
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