Naslov
Structural and thermal characterisation of PEO/LiAlg blends prepared by solution casting and extrusion

Autori
Perinović Jozić, Sanja ; Talijančić, Antonia ; Margaretić, Sara ; Jozić, Dražan

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

Izvornik
1st Central and Eastern European Conference on Physical Chemistry and Materials Science / Erceg, Matko ; Rotaru, Andrei ; Vrsalović, Ladislav - : SITECH, Rumunjska, 2022, 195-195

ISBN
978-606-11-8164-3

Skup
1th Central and Eastern European Conference on Physical Chemistry and Materials Science (CEEC-PCMS1)

Mjesto i datum
Split, Hrvatska, 26.07.2022. - 30.07.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
poly(ethylene oxide), lithium alginate, blend, crystallinity, XRD, FTIR, DSC, TG

Sažetak
The years of intensive research led to the fact that poly(ethylene oxide) (PEO) became a distinctive polymer choice for the preparation of polymer electrolytes for Li-ion batteries (LIB). Its main advantages lie in the broad range of complexation with different salts and electron- rich ether groups facilitating the salt dissociation [1]. On the other hand, it has lower ionic conductivity at room temperature, which can be improved by blending PEO with other polymers. Furthermore, reducing the crystalline phase favours faster ion transport through the amorphous phase, which results in higher conductivity [2]. Lithium alginate (LiAlg) is a polyelectrolyte with an excellent predisposition to form hydrogen bonds between its hydroxyl groups and ether oxygen in PEO. The previous investigation of PEO blends with sodium alginate (NaAlg) showed excellent film- forming ability and good thermal properties [3]. Therefore, altering the cation in alginate can potentially prepare a better polymer matrix for incorporating lithium salt and ion transport through the polymer matrix. This investigation focuses on different processing methods of PEO/LiAlg blends and their influence on the blend structure and thermal properties. The solution casting method enables the preparation of the blends with the higher content of LiAlg, unlike the extrusion. The polymer blends' structural and morphological features have been investigated using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Investigation revealed changes in the structure by incorporating LiAlg in PEO, which are more pronounced with the increment of LiAlg content but with no significant difference between the processing methods. In addition, thermal properties and thermal stability were investigated by using differential scanning calorimetry (DSC) and thermogravimetry (TG). The addition of LiAlg has a complex effect on the thermal phase transitions of PEO, with the most pronounced influence on the crystallisation from the melt. LiAlg postpones it, and as the content of LiAlg increases, it is more pronounced, especially for extrusion processing. However, the degree of crystallinity remained high and almost unchanged. PEO/LiAlg degrades in three degradation stages whit a slight shift of PEO degradation stage to a higher temperature than pure PEO. There is no significant difference between the results obtained with different processing methods. LiAlg increases the degradation rate of PEO with the content of LiAlg up to 10 wt% while reducing it with the increase of LiAlg content in PEO.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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