Naslov
Influence of Bismuth oxide nanoparticles on mechanical properties of epoxy resin

Autori
Ropuš, Ivana ; Haramina, Tatjana ; Jagdale, Pravin ; Tagliaferro, Alberto

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
13th Multinational Congress on Microscopy, Book of Abstracts / Gajović, Andreja ; Weber, Igor ; Kovačević, Goran ; Ćadež, Iva ; Šegota, Suzana ; Peharec Štefanić, Petra ; Vidoš, Ana - Zagreb : Institut Ruđer Bošković ; Hrvatsko mikroskopijsko društvo, 2017, 491-492

ISBN
978-953-7941-19-2

Skup
13th Multinational Congress on Microscopy

Mjesto i datum
Rovinj, Hrvatska, 24.09.2017. - 29.09.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
nanocomposites, epoxy resin, bismuth oxide, mechanical properties

Sažetak
Bismuth oxide (Bi2O3) has very interesting optical and electrical properties (1-2). It is worth then to have a look also at the impact they can have on mechanical properties of composites. In order to investigate mechanical properties of epoxy based composites containing Bi2O3 as a filler two composites with 1 wt % and 3 wt % of Bi2O3 powder were prepared. Dispersion of the filler in the epoxy matrix was achieved by means of a 3 roll mill calender method. Field Emission Scanning Electron Microscopy (FESEM) was used to analyze nanocomposite cryo-fractured surface morphology in order to investigate powder dispersion. Mechanical properties are tested by means of Vickers microhardness test, three points bending flexural test and dynamic mechanical analysis (DMA). Microhardnesses of the nanocomposites do not change sensibly with respect to the neat epoxy resin. While microhardness of 1 wt % Bi2O3 composite is lower than the neat epoxy resin, the microhardness of the nanocomposite with 3 wt % Bi2O3 increased with respect to that of the neat epoxy resin. Flexural modulus and strength of both nanocomposites decreased compared to those of the neat epoxy resin. Inclusion of bismuth oxide nanoparticles in the epoxy resin matrices reduced the flexural properties more than 20 %. The effect was more pronounced for the nanocomposite with 1 wt % of filler. Dynamic mechanical analysis (DMA) was performed with tensile stress applied. It shows that 1 wt % of filler has greater impact on properties of the matrix as glass to rubber transition where material turns from stiff to ductile takes place at higher temperatures. However the storage modulus of nanocomposites with 1 wt % of Bi2O3 decreases both in glass and rubber conditions compared to those of the neat epoxy resin and of the nanocomposite with 3 wt % of filler. The damping factor tan ? of the two later materials shows two peaks in the near glass transition region. For the nanocomposite with less nanoparticles the peak at lower temperatures vanishes and the intensity of the peak at higher temperatures increases leading to the conclusion that the polymer structure is more homogeneous. All results lead to the conclusion that for the analyzed systems fewer nanoparticles have higher impact on the material's behavior.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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