Proizvodnja i karakterizacija funkcionalnog filamenta na osnovi cikloolefinskog kopolimera

undergraduate thesis

• Title (english): Production and characterization of functional filament based on cycloolefin copolymer
• Author: Ivana Labaš
• Mentor: Domagoj Vrsaljko (mentor)
• Committee member: Domagoj Vrsaljko (predsjednik povjerenstva)
• Committee member: Vesna Ocelić Bulatović (član povjerenstva)
• Committee member: Anita Šalić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Aditivna proizvodnja (engl. Additive Manufacturing, AM) predstavlja skup postupaka pomoću kojih se mogu izraditi dijelovi, odnosno predmeti relativno komplicirane geometrije na temelju računalnog 3D modela, sloj po sloj. Aditivnim se postupcima uspješno mogu izraditi prototipovi, kalupi i alati velike preciznosti te funkcionalni dijelovi za uporabu. No, brzina izrade, izbor materijala i dimenzije modela zasad su ograničene. Proizvodnja rastaljenim filamentom (FFF) je najraširenija vrsta aditivne proizvodnja, a temelji se na procesu ekstruzije materijala kroz glavu 3D-pisača. Glava pisača pritom tali polimer, odnosno filament, rastaljeni filament polaže se na podlogu pisača, a objekt se izrađuje sloj po sloj. Cilj ovog rada bio je proizvesti funkcionalni filament od cikloolefinskog kopolimera (COC) uz dodatak punila, TiO2 i CNT, promjera 1,75 mm uz mogućnost odstupanja ± 5 %. Titanijev dioksid se odlikuje fotokatalitičkim svojstvima zbog čega se koristi kao fotokatalizator, dok su ugljikove nanocjevčice korištene u svrhu poboljšanja fotokatalitičke aktivnosti TiO2. Pomoću tako pripremljenih kompozita, moguće je uz prisutnost Sunčeve ili UV svjetlosti razgraditi onečišćivala u vodi. Proizvedeni filamenti korišteni su za ispis epruveta pomoću 3D-pisača proizvođača Zortrax M200. Od deset pripremljenih filamenata, samo su od šest uzoraka ispisane epruvete. Ispisani uzorci epruveta karakterizirani su ispitivanjem mehaničkih svojstava kidalicom te termogravimetrijskom analizom (TGA). Ispitivanjem mehaničkih svojstava uzoraka utvrđeno je da je uzorak COC100 najveće krutosti od ispitivanih uzoraka, dok je uzorak COC-10T-0,1C najmanje krutosti. Termogravimetrijskom analizom triju uzoraka sa različitim udjelom punila, utvrđeno je da toplinska razgradnja uzorka COC-15T-0,25C započinje pri najvišoj temperaturi, što znači da je ujedno i veće toplinske postojanosti od ostalih uzoraka.

Abstract (english)

Additive manufacturing is a set of processes that can produce parts of objects with relatively complicated geometry based on a 3D computer model, layer by layer. Prototypes, molds and high-precision tools, as well as functional parts for use, can be made successfully using additive processes. However, the speed of production, the choice of materials and the dimensions of the model are currently limited. Fused Filament Fabrication (FFF) is the most widely used type od additive manufacturing and is based on the process of extruding material through the head of a 3D printer. The print head melts the polymer, i.e. the filament, the melted filament is placed on the print plate and the object is fabricated layer by layer. The aim of this work was to produce a functional filament from cyclic olefin copolymer (COC) with the addition of TiO2 and CNT fillers, with a diameter of 1.75 mm and the possibility of ± 5% deviation. Titanium dioxide is characterized by photocatalytic properties, so it is used as a photocatalyst, while carbon nanotubes were used to improve the photocatalytic activity of TiO2. Using composites thus produced, it is possible to degrade pollutants in the water in the presence of sunlight or UV light. The fabricated filaments were used to print test tubes using a Zortrax M200 3D printer. Of the ten filaments prepared, only six filaments could be used to print test samples. The printed test samples were characterized by testing the mechanical properties on a UTM and by thermogravimetric analysis (TGA). When the mechanical properties of the samples were examined, it was found that the COC100 sample was the stiffest, while the COC-10T-0,1C sample was the least stiff. By thermogravimetric analysis of three samples with different filler content, it was found that the thermal decomposition of sample COC-15T-0,25C starts at the highest temperature, which means that it is also more thermally stable than the other samples.

• Keywords: aditivna proizvodnja; filamenti; cikloolefinski kopolimer; kidalica; TGA
• Keywords (english): additive manufacturing; filaments; cyclic olefin copolymer; UTM; TGA
• Language: croatian
• URN:NBN: urn:nbn:hr:149:677593
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-03-03 10:11:50