Mješavine termoplastičnog škroba kao materijal za pakiranje

master's thesis

• Title (english): Thermoplastic starch blends as as packaging material
• Author: Emilija Pavlek
• Mentor: Vesna Ocelić Bulatović (mentor)
• Committee member: Vesna Ocelić Bulatović (predsjednik povjerenstva)
• Committee member: Dajana Kučić Grgić (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-06-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Neodgovarajuće zbrinjavanje plastike nakon korištenja dovodi do povećanja zabrinutosti uslijed rasta globalnih ekoloških problema poput povećanja emisije CO2, smanjenja naftnih izvora i onečišćenja okoliša što rezultira potrebom za istraživanjem i razvojem biorazgradljivih materijala kao alternative konvencionalnim materijalima za pakiranje. Konstantno iscrpljivanje prirodnih resursa uzrokovano materijalima na bazi nafte dovodi do pojave novih biopolimernih materijala primjenjivih kao materijal za pakiranje. Biorazgradljivi materijali razgrađuju se u okolišu pod utjecajem mikroorganizama, vode, kisika i sunčeve svjetlosti, kompostabilni su i proizvode se od obnovljivih izvora energije. Osim pozitivnog utjecaja na okoliš, biorazgradljivi materijali povoljni su za korištenje i s ekonomskog aspekta jer su jeftini, lako dostupni te smanjuju ovisnost tržišne cijene plastike o naftnoj industriji. U ovom radu analizirana su primjenska svojstva pripremljenih biorazgradljivih polimernih mješavina termoplastičnog škroba (TPS) i polilaktida (PLA) bez i s dodatkom limunske kiseline (LK). Cjelokupna identifikacija i karakterizacija biorazgradljivih TPS/PLA mješavina provedena je FTIR - ATR spektroskopijom, morfologija polimernih mješavina pratila se primjenom pretražne elektronske mikroskopije (SEM), toplinska svojstva tehnikama diferencijalne pretražne kalorimetrije (DSC) i termogravimetrijske analize (TGA), a ispitana su i propusnost vodene pare (PVP) te mehanička svojstva pripremljenih polimernih mješavina. Rezultati ukazuju na poboljšanje adhezije između faza TPS-a i PLA dodatkom limunske kiseline, bolju homogenost u strukturi i snažniju kompatibilnost polimernih mješavina što rezultira boljim toplinskim, mehaničkim i barijernim svojstvima analiziranih biorazgradljivih polimernih TPS/PLA mješavina.

Abstract (english)

Improper disposal of plastics after use leads to increasing concerns due to the growth of global environmental problems such as increasing CO2 emissions, decreasing oil sources and environmental pollution resulting in the need for research and development of biodegradable materials as an alternative to conventional packaging materials. The constant depletion of natural resources caused by petroleum-based materials leads to the emergence of new biopolymer materials applicable as packaging materials. Biodegradable materials break down in the environment under the influence of microorganisms, water, oxygen and sunlight, are compostable and are produced from renewable energy sources. In addition to the positive impact on the environment, biodegradable materials are also favorable for use from an economic point of view because they are cheap, easily available and reduce the dependence of the market price of plastic on the oil industry. In this work, the application properties of the prepared biodegradable polymer mixtures of thermoplastic starch (TPS) and polylactide (PLA) without and with the addition of citric acid (LK) were analyzed. The overall identification and characterization of biodegradable TPS/PLA mixtures was carried out by FTIR - ATR spectroscopy, the morphology of polymer mixtures was monitored using scanning electron microscopy (SEM), thermal properties using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques, and permeability was also tested water vapor (PVP) and mechanical properties of prepared polymer mixtures. The results indicate an improvement in the adhesion between TPS and PLA phases with the addition of citric acid, better homogeneity in the structure and stronger compatibility of the polymer mixtures, which results in better thermal, mechanical and barrier properties of the analyzed biodegradable polymer TPS/PLA mixtures.

• Keywords: biorazgradljivi polimeri; termoplastični škrob (TPS); polilaktid (PLA)
• Keywords (english): biodegradable polymers; thermoplastic starch (TPS); polylactide (PLA)
• Language: croatian
• URN:NBN: urn:nbn:hr:149:939152
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-07-26 12:57:38