Utjecaj Fe2O3 na svojstva PCL polimera

master's thesis

• Title (english): The influence of Fe2O3 on PCL polymer properties
• Author: Mirjana Tolj
• Mentor: Mirela Leskovac (mentor)
• Mentor: Zrinka Buhin Šturlić (komentor)
• Committee member: Mirela Leskovac (predsjednik povjerenstva)
• Committee member: Zrinka Buhin Šturlić (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-07-17, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Polikaprolakton (PCL) je biorazgradivi, semikristalasti polimer niske temperature taljenja koja mu omogućava jednostavnu preradu. Najčešće se koristi u području biomedicine s naglaskom na inženjerstvo tkiva. Iako posjeduje izuzetna fizikalna i biološka svojstva, za poboljšanje toplinskih i mehaničkih svojstava PCL-u se dodaju razna punila. U ovom radu istražen je utjecaj Fe2O3 punila na svojstva PCL polimera. Pripravljeni su uzroci PCL polimera i PCL/Fe2O3 kompozita zamiješavanjem PCL-a s različitim udjelom Fe2O3 punila, φ = 0,1; 0,3; 0,5; i 1,0 % u talini, na dvopužnom ekstruderu. Mjerenjem kontaktnog kuta određena je slobodna površinska energija komponenata te je proračunat termodinamički rad adhezije. Toplinska svojstva uzoraka ispitana su diferencijalnom pretražnom kalorimetrijom (DSC), mjerenjem toplinske vodljivosti i termogravimetrijskom analizom (TGA). Mehanička svojstva određena su rasteznim ispitivanjem. Rezultati su pokazali da dodatak Fe2O3 punila potiče kristalizaciju PCL polimera budući da se entalpije taljenja i kristalizacije povećavaju kod svih kompozitnih sustava te da toplinska vodljivost kompozita raste u odnosu na čistu PCL matricu. Rezultati TG analize pokazali su da dodatak punila utječe na poboljšanje toplinske stabilnosti PCL matrice posebice na početku procesa toplinske razgradnje. Rad adhezije pokazuje porast kod svih kompozitnih sustava što ukazuje na postojanje interakcija na međupovršini matrica/punilo. Kod mehaničkih svojstava nije zabilježen značajan utjecaj dodatka punila.

Abstract (english)

Polycaprolactone is biodegradable, semicrystalline polymer with low melting point which allows it to be simple processing. It is most often used in the field of biomedicine with an emphasis on tissue engineering. Although it has exceptional physical and biological properties, various fillers are added to PCL to improve the thermal and mechanical properties. In this paper, the influence of Fe2O3 filler on the PCL polymer properties was investigated. The samples of PCL polymer and PCL/Fe2O3 composites were prepared by mixing PCL with different amount of Fe2O3 filler, φ = 0,1; 0,3; 0,5; i 1,0 % in the melt, on twin-screw extruder. By measuring the contact angle, the surface free energy and thermodynamic work of adhesion of the samples were determined. Thermal properties were determined by differential scanning calorimetry (DSC), measuring thermal conductivity and thermogravimetric analysis (TGA). The mechanical properties were determined by a tensile test. Results showed that addition of Fe2O3 filler stimulates crystallization of PCL polymer as the enthalpies of melting and crystallization increase in all composite systems and that the thermal conductivity of composites increases compared to the PCL matrix. Results of TG analysis showed that addition of the filler improves thermal stability of PCL matrix especially at the beginning of thermal decomposition. The work of adhesion shows an increase in all composite systems, which indicates the existence of interactions on the matrix/filler interface. In the case of mechanical properties, no significant effect was observed with the filler addition in PCL matrix.

• Keywords: polikaprolakton (PCL); Fe2O3; kontaktni kut; toplinska svojstva; mehanička svojstva
• Keywords (english): polycaprolactone (PCL); Fe2O3; contact angle; thermal properties; mechanical properties
• Language: croatian
• URN:NBN: urn:nbn:hr:149:570341
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Applied organic chemistry; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2022-04-20 12:51:42