Utjecaj temperature kao okolišnog faktora na stabilnost termokromnih otisaka

master's thesis

• Author: Juraj Huzjak
• 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

Pametni reaktivni materijali mijenjaju svoja svojstva kao odgovor na vanjske podražaje,

poput temperature, tlaka, svjetlosti, pH, magnetskog i električnog polja ili izloženosti

vlazi i kemijskim spojevima. Termokromni materijali mijenjaju obojenje sukladno

promijeni temperature. Termokromni otisci mogu biti izloženi visokim temperaturama

prilikom transporta i skladištenja. To izlaganje može uzrokovati trajne nepovratne

promjene u obojenju otiska i samim time utjecati na njegovu funkcionalnost. Stoga je u

ovom radu ispitan utjecaj temperature na stabilnost termokromnog otiska. Kako bi se

odredila funkcionalnost UV sušećih termokromnih sitotiskarskih otisaka različitih

aktivacijskih temperatura (12⁰C i 31⁰C) nakon izlaganja visokim temperaturama,

provedena je usporedba dvaju testova na temperaturne ekstreme od 50 i 100⁰C. Otisci su

izloženi djelovanju temperature od 50⁰C u sušioniku tijekom 30 min, 24h, 48h i 72h, te

ekstremno visokoj temperaturi od 100⁰C u trajanju samo od 30 min uz pretpostavku da

termokromni otisci neće biti dugotrajno izloženi ekstremno visokoj temperaturi. Utjecaj

temperature na stabilnost TC otiska određena je kolorimetrijskim mjerenjem i

određivanjem razlike u boji pomoću formule ukupne razlike boja CIEDE2000. Dobiveni

rezultati pokazuju kako izlaganje termokromne boje na visokim temperaturama utječe na

promjenu njenih kolorimetrijskih parametara i samim time na funkcionalnost TC otiska.

Abstract (english)

Smart reactive materials change their properties in response to external factors such as

temperature, pressure, light, pH, magnetic and electric fields, or exposure to moisture and

chemical compounds. Thermochromic materials change their color according to

temperature change. Thermochromic prints can be exposed to high temperatures during

transport and storage. This exposure can cause permanent irreversible changes in the

color of the print and thus affect its functionality. Therefore, in this work influence of

temperature on stability of thermochromic print is tested. To determine functionality of

thermochromic UV curable screen prints with different activation temperatures (12⁰C and

31⁰C) after exposure to high temperatures, a comparison of two tests at temperature

extremes of 50 and 100⁰C was performed. The samples were exposed to a temperature of

50⁰C in the oven for 30 min, 24 h, 48 h and 72 h, and an extremely high temperature of

100⁰C for 30 min under the assumption that the thermochromic prints would not be

exposed to the extreme temperature for a long time. Subsequently, colorimetric

measurement and determination of color difference was performed using the CIEDE 2000

formula to determine the effect of temperature on the stability of the TC print. The

obtained results show how the exposure of thermochromic ink at high temperatures

affects the change of its colorimetric parameters and thus the functionality of the TC print.

• Keywords: termokromne boje; temperaturna stabilnost; kolorimetrijska razlika u boji
• Keywords (english): thermochromic inks; temperature stability; colour difference
• Language: croatian
• URN:NBN: urn:nbn:hr:216:823981
• 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 23:50:59