Proizvodnja i karakterizacija funkcionalnog filamenta od PE-LD/TIO2 i PE-LD/TIO2/CNT kompozita

undergraduate thesis

• Title (english): Production and characterization of functional filament based on PE-LD/TIO2 and PE-LD/TIO2/CNT composites
• Author: Korina Žaja
• Mentor: Domagoj Vrsaljko (mentor)
• Committee member: Domagoj Vrsaljko (predsjednik povjerenstva)
• Committee member: Anita Šalić (član povjerenstva)
• Committee member: Marin Kovačić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Aditivna proizvodnja (engl. additive manufacturing) čini jedan dio proizvodnog strojarstva kojemu je krajnji cilj izrada predmeta nanošenjem čestica u tankim slojevima. Kako bi dobili konačni proizvod, potrebno je konstruirati trodimenzionalni model računalnim programima za modeliranje ili digitalizirati već postojeći objekt. Cilj ovog rada bio je uspješno proizvesti funkcionalni filament promjera 1,75 mm koji će se moći koristiti za izradu dijelova reaktora za fotokatalitičku razgradnju onečišćivala. Smjesa za ekstrudiranje pripremljena je metodom suhog miješanja (engl. dry blending) tako što su granule polietilena niske gustoće (PE-LD) pomiješane s titanijevim dioksidom (TiO2) te ugljikovim nanocjevima (CNT) u raznim omjerima. Dobivenu smjesu prethodno je potrebno ekstrudirati na dvopužnom ekstruderu, zatim slijedi usitnjavanje te ekstrudiranje na jednopužnom ekstruderu. Dodan je CNT do 0,25 %, a TiO2 do 15 % masenog udjela. Karakterizacija dobivenog filamenta provedena je diferencijalnom pretražnom kalorimetrijom (DSC), termogravimetrijskom metodom (TGA) i vlačnim testom. Epruveta za kidalicu dizajnirana je u programu za računalno potpomognuti dizajn (CAD) te je nakon dizajniranja ispisana 3D-pisačem. Završno, optimirani su uvjeti 3D-ispisa na temelju najuspješnijeg ispisa epruvete koja je bila pogodna za kidalicu. Kao rezultat uspješno su proizvedene tri epruvete od svakog uzorka kompozita i tri epruvete uzorka od čistog PE-LD-a. Diferencijalnom pretražnom kalorimetrijom nije uočen pravilan trend promjene tališta dodatkom punila. Termogravimetrijskom analizom ustanovljeno je da stvarni maseni udio punila u uzorku nije jednak onom umiješanom, te da se dodatkom punila povećava potrebna temperatura za početak razgradnje mase uzorka. Rezultati dobiveni vlačnim testom ispitivanjem na kidalici nemaju pravilan trend promjene rastezne čvrstoće dodatkom punila.

Abstract (english)

Additive manufacturing is one part of manufacturing engineering, the goal is to produce objects by applying particles in thin layers. In order to obtain the final product, it is necessary to construct a three-dimensional model with computer modeling programs or digitize an existing object. The goal of this work was to successfully produce a functional filament with a diameter of 1.75 mm that can be used to make reactor parts for the photocatalytic degradation of pollutants. The extruding mixture was prepared using the dry blending method by mixing low density polyethylene granules (PE-LD) with titanium dioxide (TiO2) and carbon nanotubes (CNT) in various proportions. The resulting mixture must first be extruded on a twin-screw extruder, followed by shredding and extrusion on a single-screw extruder. CNT was added up to 0,25 %, and TiO2 up to 15 % by mass. The obtained filament was characterized by differential scanning calorimetry (DSC), thermogravimetric method (TGA) and tensile test. The sample for the universal testing machine was designed in a computer-aided design (CAD) program and after design it was printed with a 3D-printer. Finally, the 3D-printing conditions were optimized based on the most successful printing of the sample that was suitable for the universal testing machine. As a result, three samples of each composite and three samples of pure PE-LD were successfully produced. Differential scanning calorimetry did not observe a proper trend of melting point change with the addition of fillers. By thermogravimetric analysis, it was established that the actual mass fraction of the filler in the sample is not equal to that mixed in, and that the addition of the filler increases the necessary temperature for the start of decomposition of the sample mass. The results obtained by the tensile test by testing on the universal testing machine do not show a trend of change in tensile strength with the addition of fillers.

• Keywords: filament; ekstruder; kompozit; aditivna proizvodnja; 3D-ispis
• Keywords (english): filament; extruder; composite; additive manufacturing; 3D-printing
• Language: croatian
• URN:NBN: urn:nbn:hr:149:931370
• Project: Number: KK.01.1.1.04.0006; Title: Otpad i Sunce u službi fotokatalitičke razgradnje mikroonečišćivala u vodama; Acronym: OS-Mi; Leader: Ivana Grčić; Jurisdiction: Croatia; Funder: MZO; Funding stream: Nema
• Study programme: Title: Environmental Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-03-15 09:53:50