Characteristics of the Parameters of Superfine Fibers of Poly(3-hydroxybutyrate) Modified with Tetraphenylporphyrin

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.