Influence of organically modified montmorilonite Cloisite 25A and lithium bis(oxalato)borate on the structure and thermal properties of poly(ethylene oxide) : master thesis

Polimerni nanokompoziti dobiveni su miješanjem poli(etilen-oksida) molekulske mase, M ̅ v =1 000 000 (PEO10) s nanopunilom Cloisite 25A (25A) u masenim omjerima PEO10/25A 90/10, 80/20, 70/30, 60/40, 50/50 i 40/60 metodom interkalacije iz taljevine. Polimerni nanokompozitni elektroliti dobiveni su miješanjem PEO10 s 25A u navedenim omjerima uz dodatak soli litijevog bis(oksalato)borata (LiBOB) u količini da se zadovolji omjer 1:8 (Li : kisik iz PEO10) također metodom interkalacije iz taljevine. Primjenom diferencijalne pretražne kalorimetrije (DSC) ispitivan je utjecaj dodatka nanopunila 25A i utjecaj dodatka soli LiBOB na toplinske prijelaze i kristalnost PEO10 u PEO10/25A i PEO10/25A/LiBOB uzorcima. Utvrđeno je da dodatak nanopunila 25A značajnije ne utječe na staklište, ali snižava kristalnost PEO10. Dodatak soli LiBOB u potpunosti narušava kristalnu strukturu PEO10. Primjenom termogravimetrijske analize (TGA) ispitivana je toplinska postojanost i utjecaj dodatka 25A i utjecaj dodatka soli LiBOB na toplinsku razgradnju PEO10 u PEO10/25A i PEO10/25A/LiBOB uzorcima. Utvrđeno je da se dodatkom nanopunila 25A snižava toplinska postojanost PEO10, a dodatak soli LiBOB na nju neznatno utječe. Primjenom infracrvene spektroskopije s Fourierovom transformacijom (FT-IR) ispitivan je utjecaj 25A i utjecaj dodatka soli LiBOB na strukturu PEO10 u PEO10/25A i PEO10/25A/LiBOB uzorcima. Dodatak 25A i soli LiBOB utječu na konformaciju PEO10, uz izraženiji utjecaj soli LiBOB.Polymer nanocomposites were obtained by mixing poly(ethylene oxide) of molecular weight M ̅ v =1 000 000 (PEO10) with Cloisite 25A (25A) nanofiller in weight ratios PEO10/25A 90/10, 80/20, 70/30, 60/40, 50/50 and 40/60 by the melt intercalation method. Polymer nanocomposite electrolytes were obtained by mixing PEO10 with 25A in the indicated ratios with the addition of lithium bis (oxalate) borate (LiBOB) salt in an amount to meet the 1: 8 ratio (Li: oxygen from PEO10) also by melt intercalation method. Using differential scanning calorimetry (DSC), the effect of nanofiller 25A addition and the effect of LiBOB salt addition on thermal transitions and PEO10 crystallinity in PEO10/25A and PEO10/25A/LiBOB samples were investigated. It was found that the addition of 25A does not significantly affect glass transition but lowers degree of crystallinity of PEO10. Addition of LiBOB salt completely disrupts the crystal structure of PEO10. Thermogravimetric analysis (TGA) was used to investigate the thermal stability and the effect of additive 25A and the effect of the addition of LiBOB salt on the thermal decomposition of PEO10 in PEO10/25A and PEO10/25A/LiBOB samples. Nanofiller 25A was found to reduce the thermal stability of PEO10, and the addition of LiBOB salt slightly affected it. Using Fourier transform infrared spectroscopy (FT-IR), the effect of 25A and the effect of the addition of LiBOB salt on the structure of PEO10 in PEO10/25A and PEO10/25A/LiBOB samples were investigated. 25A nanofiller and LiBOB salts affect the PEO10 conformation, with a more pronounced influence of LiBOB salts