Istraživanje utjecaja ljuskica jajeta na svojstva kompozita na osnovi polietilena

undergraduate thesis

• Title (english): Investigation on effect of egg shell on properties of polyethylene composites
• Author: Ana Rajić
• Mentor: Emi Govorčin Bajsić (mentor)
• Committee member: Emi Govorčin Bajsić (predsjednik povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Committee member: Igor Sutlović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Želja i potreba za smanjenjem ekoloških problema kao što su: zagađenje okoliša, nagomilavanje smeća, iskorištavanje naftnih derivata, prekomjerno ispuštanje CO2, plastika u morima i na kopnu, bile su razlog priprave novih materijala, koji će imati poboljšana svojstva u odnosu na pojedinačne komponente od kojih se sastoje. Teži se razvitku kompozita s bio-osnovom, poželjno biorazgradljivim, koji bi zamijenili ili barem donekle zamijenili već postojeće tradicionalne materijale. Polietilen je jedan od najpoznatijih polimera na naftnoj osnovi, a umješavanjem ljuskica jajeta, mogla bi se poboljšati njegova mehanička svojstva. Poznati su razni oblici ovog polimera sa širokim rasponom primjene. Uzorci čistog LLDPE-a, ljuskica jajeta i uzoraka LLDPE/LJJ biokompozita, ispitvani su tehnikama diferencijalne pretražne kalorimetrije (DSC) i infracrvene spektroskopije s Fourierovom transformacijom (FTIR). DSC tehnikom se utvrdilo da pri ciklusu zagrijavanja dodatak LJJ ne uzrokuje značajne promjene unutar kristalne faze LLDPE-a, odnosno ne utječe na veličinu kristala i njihovu uređenost. Nakon 2. ciklusa hlađenja, dobiven je egzoterm koji predstavlja kristalizaciju rastaljenih kristala u ciklusu zagrijavanja. Kristalište (Tc) kompozita neznatno se mijenja s porastom udjela LJJ. FTIR analizom dobiven je infracrveni spektar s karakterističnim vrpcama funkcionalnih skupina za pojedine uzorke. Analizom pojedinih vrpci uzoraka vidljivo je da nisu dobivene apsorpcijske vrpce karakterističnih valnih brojeva koji bi ukazivali na postojanje LJJ tj. kalcijeva karbonata unutar kompozita.

Abstract (english)

The desire and need to reduce environmental problems such as: environmental pollution, accumulation of garbage, exploitation of oil derivatives, excessive release of CO2, plastic in the seas and on land, were the reason for the preparation of new materials, which will have improved properties compared to individual components of which they consist of. The aim is to develop composites with a bio-base, preferably biodegradable, which would replace or at least partially replace already existing traditional materials. Polyethylene is one of the most well-known petroleum-based polymers, by mixing in eggshells, its mechanical properties could be improved. Various forms of this polymer are known with a wide range of applications. Samples of pure LLDPE, eggshell and LLDPE/LJJ biocomposite samples were examined by differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) techniques. Using the DSC technique, it was determined that during the heating cycle, the addition of LJJ does not cause significant changes within the crystalline phase of LLDPE, that is, it does not affect the size of the crystals and their arrangement. After the 2nd cooling cycle, an exotherm was obtained, which represents the crystallization of the molten crystals in the heating cycle. The crystallinity (Tc) of the composite changes slightly with the increase in the proportion of LJJ. Infrared spectrum with characteristic bands of functional groups for individual samples was obtained by FTIR analysis. The analysis of individual bands of the samples shows that no absorption bands of characteristic wave numbers were obtained that would indicate the existence of LJJ, i.e. calcium carbonate within the composite.

• Keywords: kompoziti; biokompoziti; biorazgradnja; polietilen; ljuskice jajeta
• Keywords (english): composites; biocomposites; biodegradability; polyethylene; egg shells
• Language: croatian
• URN:NBN: urn:nbn:hr:149:755566
• 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: 2023-11-27 13:26:31