Post-graduate theses
Current Record: 24 of 6663
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Identifier |
000464661 |
Title |
MXenes: σύνθεση και ανάπτυξη πολυμερικών νανοσύνθετων υλικών |
Alternative Title |
MXenes: synthesis and development of polymer nanocomposite materials |
Author
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Θώμος, Αλέξανδρος Γ.
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Thesis advisor
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Αναστασιάδης, Σπύρος
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Reviewer
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Χρυσοπούλου, Κυριακή
Στυλιανάκης, Μηνάς
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Abstract |
Nanocomposite polymers have been the focus of interest in the research community in recent
years due to their improved properties compared to their precursors. In the present work,
nanohybrids in different compositions containing polyethylene oxide (PEO) of different
molecular weights and MXenes were synthesized under different time and temperature
conditions.
The first part of the work concerned the synthesis of MXenes, which are new and promising
materials for use in various applications. The synthesis started from the MAX precursor
material by chemical etching using HCl and NaF. Initially the synthesis was based on conditions
defined in the literature and then the effect of temperature and time on the reaction was studied
to optimize the conditions. All materials were characterized in terms of structure, morphology
and elemental composition by X-ray diffraction (XRD), scanning electron microscopy coupled
with elemental analysis by X-ray energy dispersive spectroscopy (SEM/EDX) and transmission
electron microscopy (TEM) through which the synthesis of high quality and purity materials
was confirmed.
In the second part of the work, the synthesis of the nanohybrids was carried out, by first
determining the appropriate way of their preparation. Then the polymers of different molecular
weights were mixed with MXene from the different successful syntheses at different
compositions at different compositions, to study how the structure and thermal properties of the
nanocomposites are affected. In all cases, the nanomaterials exhibited an interference structure
whose characteristics, as evidenced by XRD measurements, are not strongly affected by the
factors investigated. Furthermore, Differential Scanning Thermodynamic Composition (DSC),
used to study the thermal properties, showed a strong effect of composition mainly on the
crystallinity percentage of PEO, while the critical melting and crystallization temperatures
remain relatively stable. Finally, the presence of MXene in the nanocomposite appears to lead
to increased thermal stability as it creates an additional decomposition step at a higher
temperature, but both decomposition steps appear to be affected by increasing the percentage
of MXene.
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Language |
Greek |
Subject |
Crystallization Temperature and Decomposition temperature |
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Intercalated structure |
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Melt Temperature |
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Nanocomposites materials |
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PEO |
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Thermal properties |
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Δομή παρεμβολής |
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Θερμικές ιδιότητες |
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Θερμοκρασία κρυστάλλωσης και Θερμοκρασία αποσύνθεσης |
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Θερμοκρασία τήξης |
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Νανοσύνθετα υλικά |
Issue date |
2024-07-19 |
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/7/e/b/metadata-dlib-1715847686-764976-8341.tkl
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Views |
16 |
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