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master's thesis
Utjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera
diplomski rad
Split: University of Split, Faculty of Chemistry and Technology, 2019. urn:nbn:hr:167:876576
Knezović, Kristina
University of Split
Faculty of Chemistry and Technology
Division of Engineering and Chemistry

Institutional repository: Repository of the Faculty of chemistry and technology

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Knezović, K. (2019). Utjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera : diplomski rad (Master's thesis). Split: University of Split, Faculty of Chemistry and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:876576

Knezović, Kristina. "Utjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera : diplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:167:876576

Knezović, Kristina. "Utjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera : diplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:167:876576

Knezović, K. (2019). 'Utjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera : diplomski rad', Master's thesis, University of Split, Faculty of Chemistry and Technology, accessed 26 June 2024, https://urn.nsk.hr/urn:nbn:hr:167:876576

Knezović K. Utjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera : diplomski rad [Master's thesis]. Split: University of Split, Faculty of Chemistry and Technology; 2019 [cited 2024 June 26] Available at: https://urn.nsk.hr/urn:nbn:hr:167:876576

K. Knezović, "Utjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera : diplomski rad", Master's thesis, University of Split, Faculty of Chemistry and Technology, Split, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:167:876576

Metadata
TitleUtjecaj ubrzanog starenja na kinetiku toplinske razgradnje polimera : diplomski rad
Title (english)Influence of damp heat test on kinetics of the thermal decomposition of polymers : diploma thesis
AuthorKristina Knezović
MentorMatko Erceg (mentor)
MBZ: 243566
Committee memberNataša Stipanelov-Vrandečić (predsjednik povjerenstva)
Committee memberMatko Erceg (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
(Division of Engineering and Chemistry)
Split
Defense date and country2019-12-19, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
U ovome radu provedena je kinetička analiza dinamičke i izotermne toplinske razgradnje laminata poli(etilen-tereftalata) i ko-ekstrudiranog polipropilena u inertnoj atmosferi. Ispitivani uzorci prethodno su bili izloženi testu ubrzanog starenja (pri temperaturi 85 °C i relativnoj vlažnosti 85 %) u trajanju od 0 h, 1000 h i 2000 h. Kinetička analiza provedena je na temelju eksperimentalnih termogravimetrijskih podataka primjenom Netzsch Thermokinetics Professional programa. Na temelju rezultata analize zaključeno je o utjecaju ubrzanog starenja na kinetiku dinamičke i izotermne toplinske razgradnje ispitivanih materijala. Analiza je započeta primjenom diferencijalne Friedmanove izokonverzijske metode kojom je utvrđeno da za sve ispitivane uzorke aktivacijska energija ovisi o konverziji. Navedeno ukazuje na složeni proces razgradnje koji se ne može opisati samo jednim kinetičkim modelom i njemu pripadajućim vrijednostima aktivacijske energije i predeksponencijalnog faktora. U sljedećem koraku primijenjena je nelinearna regresijska analiza kojom je utvrđeno da se svi ispitivani uzorci razgrađuju kroz dva stupnja. Za svaki stupanj razgradnje određeni su kinetički model, aktivacijska energija i predeksponencijalni faktor. Analizom rezultata kinetičke analize ustanovljeno je da ubrzano starenje dovodi do promjene aktivacijske energije dinamičke toplinske razgradnje, ali da pri tom ne utječe na mehanizam razgradnje ispitivanih materijala. Također je utvrđeno da kod izotermne toplinske razgradnje ubrzano starenje dovodi do promjene i aktivacijske energije i mehanizma toplinske razgradnje ispitivanih materijala.
Abstract (english)
In this work, the kinetic analysis of dynamic and isothermal decomposition of laminated poly(ethylene terephthalate) and co-extruded polypropylene in an inert atmosphere was performed. The tested samples were previously exposed to the damp heat test (at 85 °C and 85% relative humidity) for 0 h, 1000 h and 2000 h. Kinetic analysis was based on experimental thermogravimetric data using the Netzsch Thermokinetics Professional software. Based on the results of the analysis, the effect of damp heat test on the kinetics of the dynamic and isothermal decomposition of the tested materials was revealed. The analysis started by applying the differential Friedman isoconversional method. The results of Friedman method show that the activation energy of the investigated decomposition process depends on the conversion. This indicates the complex decomposition process that can not be described by a single kinetic model and its associated values of activation energy and pre-exponential factor. In the next step, using nonlinear regression analysis, it was found that all tested samples decompose through two steps. The kinetic model, activation energy and pre-exponential factor for each decomposition step were calculated. By analyzing the results of kinetic analysis it was revealed that the damp heat test causes a change in the activation energy of the dynamic decomposition process, but does not affect the decomposition mechanism of tested materials. It is also found that the damp heat test causes a change of both the activation energy and the mechanism of isothermal decomposition of tested materials.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:876576
Study programmeTitle: Chemical Technology; specializations in: Materials, Environmental Protection, Mediteranean Cultures
Course: Materials
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2020-02-24 10:47:39