Title Priprema i karakterizacija PEO10/Cloisite93A i PEO/Cloisite93A/LiBoB nanokompozita : diplomski rad Title (english) Preparation and characterization PEO10/Cloisite93A i PEO10/Cloisite93A/LiBoB nanocomposites : diploma thesis Author Ivana Lešina Mentor Matko Erceg (mentor)Committee member Zoran Grubač (predsjednik povjerenstva)Committee member Nataša Stipanelov-Vrandečić (član povjerenstva)Committee member Matko Erceg (član povjerenstva)Granter University of Split Defense date and country 2017-10-31, Croatia Scientific / art field, TECHNICAL SCIENCES Abstract U ovom radu ispitivan je utjecaj dodatka organski modificiranog montmorilonita Cloisite 93A na toplinske prijelaze (staklište, talište i kristalište), kristalnost, toplinsku postojanost i strukturu poli(etilen-oksida) prosječne molekulske mase M v ̅̅̅̅ = 1 000 000 (PEO10) u PEO10/Cloisite 93A nanokompozitima te njegov utjecaj na ionsku provodnost PEO10 u PEO10/Cloisite 93A/LiBOB nanokompozitnim polimernim elektrolitima. Polimerni nanokompoziti pripravljeni su u dvije serije. U prvoj seriji uzoraka pripremljeni su nanokompoziti PEO10/Cloisite 93A različitog masenog udjela polimera i punila (100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, 0/100) metodom interkalacije iz taljevine. U drugoj seriji uzoraka, također interkalacijom iz taljevine, pripremljeni su nanokompoziti PEO10/Cloisite 93A/LiBOB različitog masenog udjela polimera i punila (100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, 0/100). Litijeva sol (LiBOB) dodaje se kako bi se osigurao elektrolit s dovoljnom koncentracijom nositelja naboja i to u količini koja zadovoljava molni omjer litijev kation:kisik iz PEO =1:8. Primjenom diferencijalne pretražne kalorimetrije (DSC) uočeno je da dodatak punila snižava talište i kristalište PEO10, ali značajnije ne utječe na njegovo staklište. Dodatak punila smanjuje toplinu taljenja i kristalizacije poli(etilen-oksida) što upućuje na smanjenje njegovog stupnja kristalnosti. Primjenom termogravimetrijske analize (TGA) utvrđeno je da povećanjem udjela punila dolazi do smanjenja toplinske postojanosti poli(etilen-oksida). Primjenom infracrvene spektroskopije s Fourierovom transformacijom (FT-IR) uočeno je da se dodatakom punila narušava spiralna konformacija izvornog poli(etilen-oksida) što ukazuje na promjenu njegove kristalnosti. Primjenom elektrokemijske impedancijske spektroskopije (EIS) utvrđeno je da se ionska provodnost nanokompozita PEO10/Cloisite93A/LiBOB povećava dodatkom punila do određene optimalne vrijednosti nakon koje počinje opadati. To ukazuje da na provodnost, osim stupnja kristalnosti, utječe i disperzija punila u matricu.
Abstract (english) This aper investigates the influence of the addition of organically modified montmorillonite Cloisite 93A on thermal transitions (glass transition temperature, melting and crystallization temperature), crystallinity, thermal stability and structure of poly (ethylene oxide) of average molecular mass M v ̅̅̅̅ = 1 000 000 (PEO10) in PEO10/Cloisite 93A nanocomposites and its influence on the ionic conductivity of PEO10 in PEO10/Cloisite 93A/LiBOB nanocomposite polymer electrolytes. Polymer nanocomposites were prepared in two series. In the first one, PEO10/Cloisite 93A nanocomposites with different weight ratios (100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, 0/100) were prepared by the melt intercalation method. In the second one, PEO10/Cloisite 93A/LiBOB nanocomposites with different polymers and fillers weight ratios (100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, 0/100) were also prepared by melt intercalation method. Lithium salt (LiBOB) was added to provide a Li + ion conducting electrolyte with enough concentration of charge carriers in an amount that achives mole ratio of lithium cation: ether-oxygen = 1:8. Differential scanning calorimetry (DSC) analysis indicates that the addition of filler reduces melting and crystallization temperatures of PEO, but does not significantly affect its glass transition temperatures. The addition of the filler reduces the melting and crystallization enthalpy of poly (ethylene oxide), suggesting a reduction of its degree of crystallinity. Thermogravimetric analysis (TGA) shows that the addition of filler reduces thermal stability of poly (ethylene oxide). Fourier Transformation Infrared Spectroscopy (FT-IR) observes that the addition of the filler causes distortion of the spiral conformation of the poly (ethylene oxide), which indicates a change in its crystallinity. Electrochemical impedance spectroscopy (EIS) shows that the ionic conductivity of the PEO10/Cloisite 93A/LiBOB nanocomposites increases by adding the filler to a certain optimum value after which it starts to decrease. This indicates that the conductivity, besides the degree of crystallinity, is also influenced by the dispersion of fillers in the matrix.
Keywords
polimerni nanokompoziti
polimerni elektroliti
nanokompoziti
punila-organska
litij-ionske baterije((Li-Ion/LIB)
poli(etilen-oksid)
Cloisite 93A
diferencijalna pretražna kalorimetrija(DSC)
termogravimetrijska analiza
infracrvena spektroskopija s Fourierovom transformacijom(FT-IR)
elektrokemijska impedancijska spektroskopija(EIS)
Keywords (english)
polymer nanocomposites
polymer electrolytes
nanocomposites
fillers-organic
lithium-ion battery(Li-Ion/LIB)
poly (ethylene oxide)
Cloisite 93A
differential scanning calorimetry(DSC)
thermogravimetric analysis(TGA)
Fouirier transformation infrared spectroscopy(FT-IR)
electrochemical impedance spectroscopy(EIS)
Language croatian URN:NBN urn:nbn:hr:167:784619 Study programme Title: Chemical Technology; specializations in: Materials, Environmental Protection, Mediteranean Cultures Type of resource Text File origin Born digital Access conditions Open access Terms of use Public note Ključne riječi doradio knjižničar/ Key words are revised by the librarian Created on 2018-08-31 10:55:42
