Struktura i svojstva PEG/n-ZnO nanokompozita

master's thesis

• Title (english): Structure and properties of PEG/n-ZnO nanocomposite
• Author: Franjo Glibo
• Mentor: Vladimir Dananić (mentor)
• Committee member: Vladimir Dananić (predsjednik povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Committee member: Emi Govorčin Bajsić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2025-02-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu istražena su svojstva PEG12000 i PEG20000 polimera i PEG/n-ZnO kompozita s različitim udjelom nanočestica. PEG koji ima vrlo dobru biokompatibilnost i hidrofilna svojstvima, odabran je kao polimerna matrica, dok je nano ZnO, zahvaljujući svojim antibakterijskim svojstvima i svojstvima apsorpcije UV zračenja, odabran je kao punilo. Kompoziti su pripravljeni u vodenoj otopini zamiješavanjem nano-ZnO čestica s PEG polimerom. Svojstva PEG polimera i PEG/n-ZnO kompozita različitog sastava istražena su primjenom različitih tehnika. Površinske karakteristike određene su mjerenjem kontaktnog kuta na goniometru. Toplinska svojstva istražena su primjenom diferencijalne pretražne kalorimetrije i termogravimetrijske analize. Istražena su svojstva PEG i PEG/n-ZnO nakon ubrzanog starenja djelovanjem UV zračenja u vremenu od 24 sati i 120 sati. Strukturne promjene nakon UV zračenja praćene su primjenom FTIR (Fourier-transform infracrvena spektroskopija) analize. Rezultati su pokazali da se na međupovršini PEG20000/n-ZnO uspostavljaju slabije interakcije u odnosu na PEG12000/n-ZnO. Kompoziti s većim udjelom nanočestica razrušavaju kristalnu strukturu PEG polimera i ne doprinose povećanju na toplinske stabilnosti. Bolja zaštitna svojstva od UV zračenja pokazao je sustav s PEG12000 i većim udjelom n-ZnO punila.

Abstract (english)

In this study, the properties of PEG12000 and PEG20000 polymers and of PEG/n-ZnO composites with different nanoparticle contents were investigated. PEG, which has very good biocompatibility and hydrophilic properties, was chosen as the polymer matrix, while
nano-ZnO was selected as the filler due to its antibacterial and UV absorption properties.
The composites were prepared in aqueous solution by mixing nano-ZnO particles with PEG polymers. The properties of the PEG polymers and the PEG/n-ZnO composites of different compositions were investigated using different techniques. The surface properties were determined by measuring the contact angle with a goniometer. The thermal properties were investigated by differential scanning calorimetry and thermogravimetric analysis.
The properties of PEG and PEG/n-ZnO were investigated after accelerated aging by
UV irradiation over 24 hours and 120 hours. Structural changes after UV irradiation were monitored by FTIR (Fourier transform infrared spectroscopy) analysis. The results showed that weaker interactions occur at the PEG20000/n-ZnO interface compared to PEG12000/n-ZnO. Composites with a higher content of nanoparticles disable the crystalline structure of the PEG polymer and do not contribute to an increase in thermal stability. The system with PEG12000 and a higher content of n-ZnO filler showed better protective properties against UV radiation.

• Keywords: polietilen-glikol (PEG); cinkov oksid (ZnO); polimerni nanokompoziti; toplinska analiza; analiza površine
• Keywords (english): polyethylene glycol (PEG); zinc oxide (ZnO); polymer nanocomposites; thermal analysis; surface analysis
• Language: croatian
• URN:NBN: urn:nbn:hr:149:993482
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-28 10:44:29