Vrkić, Toni (2021) Reakcije termokromnog otiska u funkciji indikatora okolišne temperature. Master's thesis - Graduate Programme. Grafički fakultet. [Mentor: Vukoje, Marina].
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Abstract
Sastav termokromne tiskarske boje uključuje termokromne mikrokapsule i vezivo. Termokromizam je pojava promjene boje kao rezultat faznog prijelaza uzrokovanog promjenom temperature. Reverzibilni termokromni organski pigment mijenja boju primjenom topline i vraća se u izvornu boju nakon hlađenja sustava. Termokromne mikrokapsule obično se sastoje od najmanje tri komponente - bojila, razvijača i otapala kapsuliranih u polimernu ovojnicu. Organski termokromni sustavi naširoko se koriste u različitim aplikacijama poput pametne ambalaže a u današnje vrijeme kao indikatori temperature. Njihovu primjenu ograničava loša stabilnost kada su izloženi UV zračenju i različitim kemikalijama. Ukoliko se koriste kao indikatori za ambalažu pića, mogu biti izloženi djelovanju različite koncentracije alkohola koji mogu utjecati na funkcionalnost tog istog indikatora. Prijašnja istraživanja su pokazala da utjecaj etanola smanjuje funkcionalnost termokromne boje tako što uništava polimernu ovojnicu mikrokapsule. Rezultati pokazuju da se izborom tiskovne podloge može utjecat na stabilnost termokromnog otiska prema djelovanju etanola.
| Item Type: | Master's thesis - Graduate Programme |
|---|---|
| Mentor name: | Vukoje, Marina |
| Thesis Committee: | Bolanča Mirković, Ivana and Vukoje, Marina and Kulčar, Rahela |
| Defence date: | 24 September 2021 |
| Abstract in english: | The composition of the thermochromic printing ink includes thermochromic microcapsules and a binder. Thermochromism is the appearance of a change in color as a result of a phase transition caused by a change in temperature. The reversible thermochromic organic pigment changes color by exposure to heat and returns to its original color after cooling the system. Thermochromic microcapsules usually consist of at least three components - dyes, developers and solvents encapsulated in a polymer shell. Organic thermochromic systems are widely used in various applications such as smart packaging and nowadays as temperature indicators. Their application is limited by poor stability when exposed to UV radiation and various chemicals. If used as indicators for beverage packaging, they may be exposed to different concentrations of alcohol that may affect the functionality of that same indicator. Previous research has shown that the effect of ethanol reduces the functionality of thermochromic dye by destroying the polymer shell of the microcapsule. The results show that the printing substrate can affect the stability of the thermochromic print in reaction with ethanol. |
| Uncontrolled Keywords: | termokromna boja, kemijska stabilnost, alkohol, etanol |
| Keywords in english: | thermochromic ink, chemical stability, alcohol, ethanol |
| Subjects: | TECHNICAL SCIENCES > Graphic Technology |
| Institution: | Grafički fakultet |
| City: | Zagreb |
| Number of Pages: | 32 |
| Callnumber: | VUK 2021 VRK |
| Inventory number: | DB1014 |
| Depositing User: | Nina Jelača |
| Status: | Unpublished |
| Date Deposited: | 11 Dec 2023 12:30 |
| Last Modified: | 11 Dec 2023 12:30 |
| URI: | http://eprints.grf.unizg.hr/id/eprint/3601 |
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