Učinak kompatibilizacije polietilena s otpadnim poliamidnim prahom na morfologiju i mehanička svojstva mješavina

master's thesis

• Title (english): Effect of compatibilization of polyethylene with waste polyamide powder on morphology and mechanical properties of blends
• Author: Iva Pavković
• Mentor: Sanja Lučić Blagojević (mentor)
• Committee member: Sanja Lučić Blagojević (predsjednik povjerenstva)
• Committee member: Vesna Ocelić Bulatović (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu ispitana su mehanička svojstva čistih uzoraka polietilena (PE) i poliamida (PA), nekompatibiliniziranih mješavina PE/PA te kompatibilniziranih mješavina PE/PA/PEGMA. Kako bi se istražio utjecaj kompatiblizatora PEGMA na mehanička svojsva nekompatibliziranih mješavina ispitivana su rastezna svojstva testom jednoosnog naprezanja, relaksacijska svojstva testom relaksacije naprezanja te morfologija mješavina odabranih na temelju dobivenih mehaničkih svojstava. Uzorci su pripremljeni na hidrauličkoj preši, a testovi su provedeni na univerzalnoj mehaničkoj kidalici. Morfologija odabranih polimernih mješavina analizirana je na skenirajućem elektronskom mikroskopu. Mehanička svojstva povezana su s nekoliko strukturnih čimbenika kao što je temperatura staklišta, stupanj kristalnosti te dodatak neke druge faze. Dodatkom reaktivnog kompatibilizatora PEGMA u mješavinu PE/PA poboljšana su o mehanička svojstva ispitivanih uzoraka, odnosno smanjuje se Youngov modul elastičnosti, a povećavaju se prekidno istezanje i čvrstoća. Naime, nekompatibilizirane PE/PA mješavine imaju grubu morfologiju, jasno izražene granice faza i slabu adheziju na međupovršini što rezultira slabim mehaničkim svojstvima. Dodatak kompatibilizatora PEGMA poboljšava mehanička svojstva nekomaptibiliziranih mješavina, te su najbolja svojstva pokazali uzorci s 20% i 80% udjela PE.

Abstract (english)

In this work, the mechanical properties of pure samples of polyethylene (PE) and polyamide (PA), non-compatibilized PE/PA blends and compatibilized PE/PA/PEGMA blends were investigated. To investigate the influence of the compatibilizer PEGMA on the mechanical properties of the non-compatibilized blends, the tensile properties were examined by the uniaxial stress test and the relaxation properties by the stress relaxation test. The morphology of some blends selected on the basis of mechanical properties was investigated. The samples were prepared on a hydraulic press, and the tests were carried out on a universal mechanical instrument. The morphology of the selected polymer blends was analyzed with a scanning electron microscope. The mechanical properties are related to several structural factors such as the glass transition temperature, the degree of crystallinity and the addition of some other phase. By adding the reactive compatibilizer PEGMA to the PE/PA blend, the mechanical properties of the tested samples were improved, Young's modulus of elasticity was reduced and the elongation and strength at break were increased. Namely, non-compatibilized PE/PA blends have a rough morphology, clearly defined phase boundaries and weak adhesion at the interface, which results in weak mechanical properties. The addition of compatibilizer PEGMA improves the mechanical properties of non-compatibilized blends, and the best properties were obtained for samples with 20% and 80% PE content.

• Keywords: mehanička svojstva; morfologija; polimerne mješavine; kompatibilizator; PE; PA
• Keywords (english): mechanical properties; morphology; polymer blends; compatibilizer; PE; PA
• Language: croatian
• URN:NBN: urn:nbn:hr:149:930385
• Study programme: Title: Chemical 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: Open access
• Created on: 2023-03-10 13:59:30