Reakcije termokromnog otiska u funkciji indikatora okolišne temperature

master's thesis

• Author: Toni Vrkić
• Mentor: Marina Vukoje (mentor)
• Committee member: Ivana Bolanča-Mirković (član povjerenstva)
• Committee member: Marina Vukoje (član povjerenstva)
• Committee member: Rahela Kulčar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2021-9-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology

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.

Abstract (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.

• Keywords: termokromna boja; kemijska stabilnost; alkohol; etanol
• Keywords (english): thermochromic ink; chemical stability; alcohol; ethanol
• Language: croatian
• URN:NBN: urn:nbn:hr:216:402699
• Study programme: Title: Graphic technology; specializations in: Graphic technology, Design of graphic products; Course: Graphic technology; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka grafičke tehnologije (sveučilišni/a magistar/magistra inženjer/inženjerka grafičke tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-04-18 23:51:29