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master's thesis
Priprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza
doplomski rad
2019. urn:nbn:hr:167:930064
Storić, Mihaela
University of Split
Faculty of Chemistry and Technology
Division of Engineering and Chemistry

Cite this document

Storić, M. (2019). Priprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza : doplomski rad (Master's thesis). Split: University of Split, Faculty of Chemistry and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:930064

Storić, Mihaela. "Priprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza : doplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:167:930064

Storić, Mihaela. "Priprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza : doplomski rad." Master's thesis, University of Split, Faculty of Chemistry and Technology, 2019. https://urn.nsk.hr/urn:nbn:hr:167:930064

Storić, M. (2019). 'Priprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza : doplomski rad', Master's thesis, University of Split, Faculty of Chemistry and Technology, accessed 16 November 2024, https://urn.nsk.hr/urn:nbn:hr:167:930064

Storić M. Priprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza : doplomski rad [Master's thesis]. Split: University of Split, Faculty of Chemistry and Technology; 2019 [cited 2024 November 16] Available at: https://urn.nsk.hr/urn:nbn:hr:167:930064

M. Storić, "Priprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza : doplomski rad", Master's thesis, University of Split, Faculty of Chemistry and Technology, Split, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:167:930064

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Metadata
TitlePriprema i karakterizacija mješavina poliaktidna kiselina/poli(etilen-oksid): termogravimetrijska analiza : doplomski rad
Title (english)Preparation and characterization of polyactid acid/polyethylene oxide blends: thermogravimetric analysis : diploma thesis
AuthorMihaela Storić
MentorMiće Jakić (mentor)
MBZ: 303245
Committee memberLadislav Vrsalović (predsjednik povjerenstva)
Committee memberSanja Perinović Jozić (član povjerenstva)
Committee memberMiće Jakić (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
(Division of Engineering and Chemistry)
Split
Defense date and country2019-10-30, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
U ovom radu istraživan je utjecaj dodatka poli(etilen-oksida) (PEO) na toplinska svojstva polilaktidne kiseline (PLA) primjenom dinamiĉke termogravimetrijske analize (TG) pri razliĉitim brzinama zagrijavanja u inertu. Istraživane PLA/PEO mješavine razliĉitih sastava pripremljene su ekstrudiranjem na laboratorijskom ekstruderu. Temeljem dobivenih rezultata može se zakljuĉiti kako se ĉisti PLA i PEO razgraĊuju u jednom stupnju razgradnje, dok se mješavine PLA/PEO ostalih sastava razgraĊuju kroz dva razgradna stupnja. OdreĊivanjem karakteristiĉnih TG znaĉajki može se zakljuĉiti kako dodatak PEO-a smanjuje toplinsku stabilnost PLA u istraživanim mješavinama. Podatci dobiveni TG analizom pri razliĉitim brzinama zagrijavanja upotrijebljeni su za izraĉunavanje energije aktivacije toplinske razgradnje ĉistih polimera i njihovih mješavina primjenom izokonverzijskih metoda kinetiĉke analize. Ĉisti PEO pokazuje najviše vrijednosti energije aktivacije ĉime se potvrĊuje bolja toplinska stabilnost u odnosu na ĉisti PLA. MeĊutim, dodatak PEO-a uzrokuje znaĉajno smanjenje vrijednosti energije aktivacije u prvom stupnju razgradnje svih PLA/PEO mješavina, odnosno, rezultati kinetiĉke analize su u skladu s zakljuĉcima TG analize.
Abstract (english)
In this paper, the effect of the addition of poly(ethylene oxide) (PEO) on the thermal properties of polylactide acid (PLA) was investigated using thermogravimetric analysis (TG) at different heating rates in inert. The investigated mixtures PLA/PEO of different compositions were prepared by extruding on the laboratory's extruder. Based on the obtained results, it can be concluded that degradiation of PLA and PEO has only one degradiation step, while the degradiaton of PLA/PEO composites have two degradiation steps. By determining the caracteristics of TG features, it can be concluded that the addition of PEO reduces the thermal stability of the PLA in the investigated mixtures. The data obtained by TG analysis at different rates were used to calculate the energy activation of pure polymers and mixtures by using the isoconversional methods. Pure PEO showes the highest value of activation energy, which confirms better thermal stability compared to the pure PLA. However, the addition of PEO causes a significant decrease in the value of energy activation in the first degradiation step of all mixtures of PLA/PEO, so the results of kinetic analysis are consistent with the conclusions of TG analysis.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:930064
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
Terms of useLicence In copyright icon
Created on2019-11-26 09:41:49