Abstract
The effect of small additives (1–5%) of the complex tin chloride–tetraphenylporphyrin on the structure and properties of ultrathin fibers based on poly(3-hydroxybutyrate) is studied by differential scanning calorimetry, electronic paramagnetic resonance, and scanning electron microscopy. It is shown that introduction of the porphyrin complex into the polymer fibers causes a considerable increase in the melting enthalpy and molecular mobility and a decrease in the concentration of the probe radical in the amorphous regions of the polymer. The exposure of the polymer in an aqueous medium at 70°С leads to a sharp reduction in the melting enthalpy and probe radical concentration and an increase in molecular mobility in compositions containing 5% of the porphyrin complex. Upon annealing of the fibers at 140°C, the melting enthalpy and correlation time grow, while the concentration of the probe radical decreases. The structure of the fibers is compared with the structure of previously studied ultrathin fibers with additives of complexes of different stereoregularity.
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ACKNOWLEDGMENTS
In this work, the crystallinity was measured by DSC on a DSC 204 F1 instrument (Netzsch, Germany) at the Shared Research Center New Materials and Technologies, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences.
We are grateful to A.V. Lobanov (Semenov Institute of Chemical Physics, Russian Academy of Sciences) for the provided metal complex SnCl2–TPP.
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Karpova, S.G., Ol’khov, A.A., Zhul’kina, A.L. et al. Nonwoven Materials Based on Electrospun Ultrathin Fibers of Poly(3-hydroxybutyrate) and Complex Tin Chloride–Porphyrin. Polym. Sci. Ser. A 63, 369–381 (2021). https://doi.org/10.1134/S0965545X21040040
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DOI: https://doi.org/10.1134/S0965545X21040040