Optimiranje rada ekstrudera za proizvodnju poli(etilen-tereftalatnih) filamenata

master's thesis

• Title (english): Optimizing the operation of extruders for the production of poly(ethylene terephthalate) filaments
• Author: Melani Horvat
• Mentor: Domagoj Vrsaljko (mentor)
• Committee member: Domagoj Vrsaljko (predsjednik povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Committee member: Marijana Kraljić Roković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj ovog rada bio je karakterizirati navedene materijale: Selenis Safe FT 104 – PET 104, Selenis Safe TT 100 – PET 100 te glikolom modificirani navedeni materijali (PET-G), a zatim proizvesti filamente koji bi se koristili za proizvodnju rastaljenim filamentom. Filamente tog polimernog materijala nije bilo moguće izraditi jer ih je tijekom preradbe karakterizirala mala viskoznost te ih je kod ekstruzije gravitacija previše rastezala. Dobiveni su filamenti vrlo malih promjera koji se nisu mogli koristiti za dobivanje filamenata koji bi se koristili u 3D-ispisu kao što je bio prvotni cilj rada. Ispitivani materijali su se ponovo ekstrudirali, ovaj put uz prethodno sušenje po propisima koje je naveo proizvođač. Tako dobiveni filamenti također su išli u granulator te se vršila karakterizacija dobivenih materijala sa i bez prethodnog sušenja i utvrdilo se postoji li ikakva razlika u mehaničkim svojstvima, stabilnosti te morfologiji. Određena su mehanička i toplinska svojstva čistih komponenata i pripremljenih kompozita te polimernih mješavina. Također, ispitana je morfologija, na temelju mehaničkih svojstava odabranih uzoraka. Snimljeni su FTIR spektri i provedena je analiza površinskih svojstava mjerenjem kontaktnog kuta ispitivanih materijala. Na temelju dobivenih rezultata zaključeno je da se adekvatnim sušenjem uzoraka mijenjaju mehanička svojstva navedenih materijala. Primjenom DSC analize utvrđeno je da uzorci podvrgnuti različitim toplinskim postupcima postižu različite stupnjeve kristalnosti. FTIR spektroskopijom dobivene su karakteristične vrpce ispitivanih materijala. Proučavanjem morfologije čistih materijala i kompozita potkrijepljeni su rezultati mehaničkih ispitivanja. Provedenom analizom mjerenja kontaktnog kuta utvrđeno je da netretirani kalcijev karbonat i kalcijev karbonat tretiran stearinskom kiselinom ne utječu značajno na površinska svojstva hidrofobnosti kompozita.

Abstract (english)

The objective of this study was to characterize the following materials: Selenis Safe FT 104 – PET 104, Selenis Safe TT 100 – PET 100 and glycol modified materials (PET-G). Besides the characterization, the objective was to make filaments that would be used for the fused filament fabrication. The filaments from these polymeric materials could not be made because during production they had low viscosity and were too stretched by gravity during extrusion. The obtained filaments had very small diameter that could not be used for the production of filaments used for 3D printing which was the primary objective of the study. The test materials were extruded again, this time with pre-drying according to the manufacturer's instructions. The obtained filaments were treated (processed) in granulator. The obtained materials were characterized with and without prior drying, and determined whether there was any difference in mechanical properties, stability and morphology. The mechanical and thermal properties of pure components, prepared composites and polymer blends were determined. Moreover, the morphology was examined, based on the mechanical properties of the selected samples. FTIR spectra were recorded and surface properties were analysed by measuring the contact angle of the tested materials. Based on the obtained results, the conclusion is that the mechanical properties of these materials are changing with proper drying of the samples. Using DSC analysis, it was found that samples subjected to different thermal processes achieved different degrees of crystallinity. FTIR spectroscopy obtained characteristic bands of the test materials. Examining of the morphology of pure materials and composites gave the results of mechanical testing. Conducted analysis of contact angle measurements revealed that untreated calcium carbonate and calcium carbonate treated with stearic acid did not significantly affect the surface properties of the composite hydrophobicity.

• Keywords: polimeri; poli(etilen-tereftalat); polimerni kompoziti; aditivna proizvodnja; karakterizacija
• Keywords (english): polymers; poly(ethylene terephthalate); polymer composites; additive manufacturing; characterization
• Language: croatian
• URN:NBN: urn:nbn:hr:149:043149
• Project: Number: UIP-2014-09-3154; Title: Razvoj materijala za 3D tiskanje mikroreaktora; Title: Development of materials for 3D printing of microreactors; Acronym: 3Dmicroreactors; Leader: Domagoj Vrsaljko; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: UIP
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2022-02-21 13:28:49