http://hdl.handle.net/20.500.12128/21037
Tytuł: | The dielectric response of phenothiazine‑based glass‑formers with different molecular complexity |
Autor: | Rams-Baron, Marzena Jędrzejowska, A. Jurkiewicz, Karolina Matussek, Marek Musiał, M. Paluch, M. |
Słowa kluczowe: | glass; Debye process; phenothiazine |
Data wydania: | 2021 |
Źródło: | Scientific Reports, 2021, Vol. 1, art. no. 15816 |
Abstrakt: | We examined a series of structurally related glass-forming liquids in which a phenothiazine-based tricyclic core (PTZ) was modified by attaching n-alkyl chains of different lengths (n = 4, 8, 10). We systematically disentangled the impact of chemical structure modification on the intermolecular organization and molecular dynamics probed by broadband dielectric spectroscopy (BDS). X-ray diffraction (XRD) patterns evidenced that all PTZ-derivatives are not ‘ordinary’ liquids and form nanoscale clusters. The chain length has a decisive impact on properties, exerting a plasticizing effect on the dynamics. Its elongation decreases glass transition temperature with slight impact on fragility. The increase in the medium-range order was manifested as a broadening of the dielectric loss peak reflected in the lower value of stretching parameter βKWW. A disagreement with the behavior observed for non-associating liquids was found as a deviation from the anti-correlation between the value of βKWW and the relaxation strength of the α-process. Besides, to explain the broadening of loss peak in PTZ with the longest (decyl) chain a slow Debye process was postulated. In contrast, the sample with the shortest alkyl chain and a less complex structure with predominant supramolecular assembly through π–π stacking exhibits no clear Debye-mode fingerprints. The possible reasons are also discussed. |
URI: | http://hdl.handle.net/20.500.12128/21037 |
DOI: | 10.1038/s41598-021-95127-y |
ISSN: | 2045-2322 |
Pojawia się w kolekcji: | Artykuły (WNŚiT) |
Plik | Opis | Rozmiar | Format | |
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Rams_Baron_The_dielectric_response_of_phenothiazine.pdf | 4,32 MB | Adobe PDF | Przejrzyj / Otwórz |
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