Comparative Dynamic Characteristics of Electrospun Ultrathin Fibers and Films Based on Poly(3-hydroxybutyrate)

Olga Staroverova1, Svetlana Karpova1, Alexey Iordanskii1, Anatoliy Olkhov1,2, Anatoliy Khvatov1, Alexandru Mihai Grumezescu3, Natalia Kildeeva4, Marina Artsis1 and Gennady Zaikov1
Affiliation: 
1General Institute of Chemical Physics of Russian Academy of Sciences, 4 Kosygin St., 119991 Moscow, Russian Federation; aljordan08@gmail.com, gezaikov@yahoo.com 2G. Plekhanov Russian University of Economics, 9 Stremyannoy Ln., 117997 Moscow, Russian Federation; aolkhov72@yandex.ru 3University Politehnica of Bucharest, 1-7 Polizu str., 011061 Bucharest, Romania; grumezescu@yahoo.com 4Moscow State Institute of Design and Technology, 1 Malaya Kaluzhskaya St., 119071 Moscow, Russian Federation; knr@staff.msta.ac.ru
DOI: 
https://doi.org/10.23939/chcht10.02.151
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Abstract: 
The dynamic of polymer chains for electrospun poly(3-hydroxybutyrate) (PHB) fibers and the PHB films was studied with spin probe characteristics obtained by ESR technique. The ESR data combined with DSC analysis reveal the presence of two TEMPO probe populations with different correlation times indicating the heterogeneous structure of intercrystalline areas in the films, fibers and the cold rolled fiber mats. The ESR data are in agreement with the 2-mode model of amorphous state in semicrystalline polymers. The difference in peak intensities shows that effective correlation time in the electrospun fibers exceeds the same characteristic in the film, that also indicates the slower molecular mobility in the low-dense amorphous fraction of PHB fibers as compared to the film. The impact of potential aggressive factors such as water, temperature and ozone upon probe mobility allows suggesting that both the fiber electrospinning and the cold-rolling procedure lead to rearrangement in the intercrystalline fields of PHB that contribute to the progress in the fiber stabilization against the aggressive factors.
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