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| Identifier |
000449146 |
| Title |
Νανοσύνθετα υλικά πολυμερούς / οξειδίου του γραφενίου : επίδραση των διεπιφανειακών αλληλεπιδράσεων |
| Alternative Title |
Polymer / graphene oxide nanocomposites: effect of interfacial interactions |
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Author
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Καρνής, Ιωάννης Κ.
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Thesis advisor
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Αναστασιάδης, Σπύρος
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Reviewer
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Χρυσοπούλου. Κυριακή
Καρατάσος, Κωνσταντίνος
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| Abstract |
Polymer nanocomposites have been in focus of interest of the research community due to their
improved properties compared to the respective ones of the pure polymers. In the present master
thesis, nanohybrids which consisted of hyperbranched polymers of different generation and
graphene oxides, GO, with different degree of oxidation at different concentrations were
developed to cover the whole regime from pure polymer to pure graphene oxide.
In the first part of this work, the synthesis and characterization of the graphene oxide samples was
performed. The change in the degree of oxidation was attempted either by changing the oxidation
time or by altering the amount of oxidizing agent. The structure and properties of all the materials
were investigated while their degree of oxidation was determined, as well, using X-ray Diffraction
(XRD), Infrared (FTIR) and Raman Spectroscopy, Differential Scanning Calorimetry (DSC),
Thermogravimetric Analysis (TGA), as well as X-ray Photoelectron Spectroscopy (XPS). Weakly
to fully oxidized graphene oxides were synthesized by changing the mass of the oxidizing agent
while the oxidation time did not seem to significantly affect the results.
In the second part of the work, nanohybrids were synthesized using three hyperbranched polymers
and GOs of different hydrophilicity in order to study the effect of the different interactions on their
structure and thermal properties. Differences were observed in the structure of the nanocomposites
with X-ray Diffraction indicating the existence of either a phase-separated structure or an
intercalated structure depending on the degree of oxidation of GO. The thermal properties are also
influenced by the observed structure of the nanohybrids whereas there is a significant effect of the
presence of GO on the thermal stability of the polymer and of the presence of the polymer on the
reduction temperature of GO.
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| Language |
Greek |
| Subject |
Graphitic materials |
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Polymers |
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Γραφιτικά υλικά |
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Πολυμερή |
| Issue date |
2022-07-28 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
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Type of Work--Post-graduate theses
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| Permanent Link |
https://elocus.lib.uoc.gr//dlib/1/6/6/metadata-dlib-1655970171-286341-745.tkl
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| Views |
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