Struktura i svojstva kompozita PA/TiO2

master's thesis

• Title (english): Structure and properties of PA/TiO2 composites
• Author: Domagoj Šubarić
• Mentor: Sanja Lučić Blagojević (mentor)
• Committee member: Sanja Lučić Blagojević (predsjednik povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-07-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu ispitan je utjecaj dodatka TiO2 nanočestica u rasponu masenih udjela od 1 do 5% na strukturu i svojstva polimerne poliamidne PA 2200 matrice. Polimerni nanokompoziti pripravljeni su postupkom iz taline koristeći Brabender gnjetilicu te hidrauličku prešu Fontune. Karakterizacija uzoraka provedena je diferencijalnom pretražnom kalorimetrijom (DSC), termogravimetrijskom analizom (TGA), metodom istoosnog istezanja te je određena toplinska vodljivost THB metodom. DSC analiza pokazuje kako TiO2 nanopunila poboljšavaju kristalizaciju polimerne matrice, povisuju temperature kristalizacije polimerne matrice odnosno djeluju kao nukleacijski centri. TiO2 punila također pospješuju stvaranje stabilnijih i uređenijih kristalnih struktura. TGA analizom dokazano je da dodatak TiO2 nanopunila povećava temperaturu početka razgradnje PA matrice odnosno poboljšava toplinsko stabilnost PA matrice. Ispitivanjem mehaničkih svojstava uzoraka istoosnim istezanjem vidljivo je kako dodatkom nanopunila dolazi do smanjenja modula te neznatnih promjena čvrstoće i istezanja u točki popuštanja u odnosu na čistu polimernu matricu. Dodatak TiO2 nanočestica povećava vrijednosti toplinske vodljivosti nanokompozita u odnosu na čistu polimernu matricu.

Abstract (english)

In this paper, the effect of the addition of TiO2 nanoparticles of a range of 1% wt. to 5% wt. on the structure and properties of PA 2200 polymer matrix was investigated. Polymer nanocomposites were prepared by melting the polymer and mixing the nanoparticles using the Brabender plasticoder and Fontune hydraulic press. The characterization of the samples was performed using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tenisle test and thermal conductivity using THB method. DSC analysis shows that TiO2 nanofiller improve the polymer matrix crystallization and increase the crystallization temperature of the polymer matrix by acting as nucleation centres. Additionally, TiO2 nanofiller contribute to the formation of more stable crystal structures. TGA analysis showed that addition of TiO2 nanoparticles shifts the temperature at the beginning of degradation toward higher values, therefore increasing thermal stability of PA matrix. Mechanical properties determined by tensile stress test, imply that by the addition of the TiO2 nanofiller, the secant modulus is reduced. Additionally, slight changes in yield stress and yield strain relative to the pure polymer matrix were observed. The addition of TiO2 nanoparticles increases the thermal conductivity of a nanocomposite relative to a pure polymer matrix.

• Keywords: struktura i svojstva PA/TiO2 nanokompozita; toplinska stabilnost; toplinska svojstva; mehanička svojstva; toplinska vodljivost
• Keywords (english): structure and properties of PA/TiO2 nanocomposites; thermal stability; thermal properties; mechanical properties; thermal conductivity
• Language: croatian
• URN:NBN: urn:nbn:hr:149:066447
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2022-02-27 16:44:39