Naslov
Preparation and characterization of poly(ethylene oxide)/Cloisite 20A nanocomposites

Autori
Irena Krešić, Matko Erceg, Nataša Stipanelov Vrandečić, Sanja Perinović Jozić

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

Skup
27. hrvatski skup kemičara i kemijskih inženjera (27HSKIKI)

Mjesto i datum
Veli Lošinj, Hrvatska, 05.10.2021. - 08.10.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
nanocomposites, poly(ethylene-oxide), crystallinity

Sažetak
Environmental and safety regulations require modifications of recently used chemical power sources. In last four decades, scientists made considerable effort in trying to substitute common liquid electrolytes with solid electrolytes. [1] Among these, polymer systems based on poly(ethylene oxide) (PEO) have attracted considerable attention, especially in the field of batteries such as lithium-ion batteries [2]. Although PEO is known to dissolve a large number of lithium salts, his high degree of crystallinity is thought to be the main reason for low ionic conductivity of PEO based solid polymer electrolytes. In order to improve the ionic conductivity of solid polymer electrolyte (SPE) various strategies have been developed, among which is the modification of the polymer matrix by incorporation of nanofillers. In this work nanocomposites of poly(ethylene oxide) with viscometric average molecular weight of 1 000 000 (PEO10) and 5 000 000 (PEO50) and organically modified montmorillonite Cloisite 20A as nanofiller were prepared by melt intercalation. Nanocomposites PEO10/20A and PEO50/20A with different weight ratios of polymer matrix to clay were analysed by differential scanning calorimetry (DSC) and dynamic thermogravimetry (TG) in order to investigate the crystallinity and thermal properties. Differential scanning calorimetry shows that the glass temperatures of PEO10 and PEO50 are not significantly altered by the addition of Cloisite 20A. Values of characteristic melting temperatures of nanocomposites show that the extrapolated onset temperatures remained practically unchanged while the peak temperatures and extrapolated end temperatures are lowered compared to pure PEO. The influence of nanofiller on the degree of crystallinity of polymer matrix becomes more pronounced with the addition of Cloisite 20A over 40 wt. %. The thermogravimetric analysis revealed that the degradation of nanocomposites occurs through one degradation step for PEO10/20A nanocomposites with up to 70 wt. % and for PEO50/20A nanocomposites with up to 90 wt. % of Cloisite 20A. Addition of Cloisite 20A decreases the thermal stability of both PEO10 and PEO50. The onset degradation temperatures and the temperatures at the maximum degradation rate show lower values compared to pure PEO regardless of matrix molecular weight. REFERENCES [1] J. Reiter, R. Dominko, M. Nádherná, I. Jakubec, Journal of Power Sources 2009, 189, 133– 138. [2] L. Long, S. Wang, M. Xiao, Y. Meng, Journal of Materials Chemistry A 2016, 4, 10038–10069.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA