Structural-dynamic studies combining X-ray diffraction analysis, thermophysical measurements (DSC), X-ray diffraction analysis, probe EPR method, and scanning electron microscopy are performed. The structural and dynamic characteristics of electrospun superfine fibers based on poly-(3-hydroxybutyrate) (PHB) containing a low concentration of the tetraphenylporphyrin complex (TPP) (0–5%) are considered. It is shown that the addition of tetramethylporphyrin complexes to PHB fibers changes the morphology, a slight decrease in crystallinity is observed, and the molecular mobility in the amorphous regions of the polymer slows down. The temperature action on the fibers (annealing at 140°C) leads to a sharp increase in crystallinity and molecular mobility in the amorphous regions of poly(3-hydroxybutyrate)—TPP fibers. Exposure to an aqueous medium at 70°C is accompanied by a sharp decrease in the enthalpy of melting and an increase in the molecular mobility of chains in the amorphous regions of the fiber.
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In this work, crystallinity measurements were carried out by DSC on a DSC204 F1 device from Netzsch, Germany (Common Use Center New Materials and Technologies of the Institute of Biochemical Physics of the Russian Academy of Sciences).
We express our deep gratitude to A.V. Krivandin and O.N. Shatalova for the provided results of the X-ray diffraction study.
The work was performed within the Fundamental Program of Scientific Researches RAS АААА-17‑117040610309‑0.
Translated by M. Drozdova
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Karpova, S.G., Olkhov, A.A., Popov, A.A. et al. Characteristics of the Parameters of Superfine Fibers of Poly(3-hydroxybutyrate) Modified with Tetraphenylporphyrin. Inorg. Mater. Appl. Res. 12, 44–54 (2021). https://doi.org/10.1134/S2075113321010184
- stable radical TEMPO
- correlation times
- superfine fibers
- EPR method
- two-component amorphous phase