Geodesic
Effect of annealing on the molecular structure of chemically carbonized poly(vinylidene fluoride)
Čelâbinskij fiziko-matematičeskij žurnal, Tome 7 (2022) no. 3, pp. 351-358.

Voir la notice de l'article provenant de la source Math-Net.Ru

Changes in the IR spectra of a sample of partially dehydrofluorinated poly(vinylidene fluoride) during step-by-step annealing in the range of 95–180$^\circ$ have been studied. Dehydrofluorination was carried out chemically for 5 hours. Prior to the heat treatment, the sample was stored for 1945 hours at a pressure not exceeding 0.05 Torr and was removed from the pumped volume only for systematic measurements of the IR spectra. An increase in the final annealing temperature leads to a consistent decrease in the IR absorption in almost all frequency intervals. The only exception is the growth of a peak of unknown origin centered at 768 cm$^{-1}$. The analysis of the spectra in the frequency intervals of OH bonds oscillations showed that the thermal exposure increases the hygroscopicity of the material due to the destruction of closed pores of a nanoscopic size. The results of measurements of the spectral areas in the intervals of 960–1280 and 2800–3040 cm$^{-1}$ (corresponding to the stretching vibrations of C-F and C-H bonds) demonstrate their proportional decrease during annealing. Such proportionality may indicate that the elimination of both fluorine and ethoxy groups occurs as a result of either the same process or two related reactions. An alternative explanation is based on the hypothesis that the removal of fluorine leads to a more symmetrical arrangement of ethoxy groups relative to the carbon chain. In this case, a decrease in the absorption in the frequency range of 2800–3040 cm$^{-1}$ will occur without their cleavage.
Keywords: poly(vinylidene fluoride), chemical dehydrofluorination, IR spectroscopy, annealing. 
@article{CHFMJ_2022_7_3_a7,
     author = {V. E. Zhivulin and R. K. Khairanov and N. A. Zlobina and S. E. Evsyukov and L. A. Pesin},
     title = {Effect of annealing on the molecular structure of chemically carbonized poly(vinylidene fluoride)},
     journal = {\v{C}el\^abinskij fiziko-matemati\v{c}eskij \v{z}urnal},
     pages = {351--358},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHFMJ_2022_7_3_a7/}
}
TY  - JOUR
AU  - V. E. Zhivulin
AU  - R. K. Khairanov
AU  - N. A. Zlobina
AU  - S. E. Evsyukov
AU  - L. A. Pesin
TI  - Effect of annealing on the molecular structure of chemically carbonized poly(vinylidene fluoride)
JO  - Čelâbinskij fiziko-matematičeskij žurnal
PY  - 2022
SP  - 351
EP  - 358
VL  - 7
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CHFMJ_2022_7_3_a7/
LA  - ru
ID  - CHFMJ_2022_7_3_a7
ER  - 
%0 Journal Article
%A V. E. Zhivulin
%A R. K. Khairanov
%A N. A. Zlobina
%A S. E. Evsyukov
%A L. A. Pesin
%T Effect of annealing on the molecular structure of chemically carbonized poly(vinylidene fluoride)
%J Čelâbinskij fiziko-matematičeskij žurnal
%D 2022
%P 351-358
%V 7
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CHFMJ_2022_7_3_a7/
%G ru
%F CHFMJ_2022_7_3_a7
V. E. Zhivulin; R. K. Khairanov; N. A. Zlobina; S. E. Evsyukov; L. A. Pesin. Effect of annealing on the molecular structure of chemically carbonized poly(vinylidene fluoride). Čelâbinskij fiziko-matematičeskij žurnal, Tome 7 (2022) no. 3, pp. 351-358. http://geodesic.mathdoc.fr/item/CHFMJ_2022_7_3_a7/

[1] R. Heimann, L. Kavan, S. Evsyukov, Carbyne and carbynoid structures, Springer Dordrecht, Dordrecht, 1999

[2] Zhivulin V. E., Pesin L. A., Belenkov E. A., Greshnyakov V. A., Zlobina N., Brzhezinskaya M., “Ageing of chemically modified poly(vinylidene fluoride) film: Evolution of triple carbon-carbon bonds infrared absorption”, Polymer Degradation and Stability, 172 (2020), 109059

[3] Pesin L. A., “Radiation-induced carbonization of polyvinylidene fluoride: Part I (Review)”, Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques, 15:6 (2021), 1296–1320 | DOI

[4] Zhivulin V. E., Khairanov R. Kh., Zlobina N. A., Doroshenko O. P., Evsyukov S. E., Doroshenko I. Yu., Pesin L. A., “Evolution of molecular structure of a dehydrofluorinated poly(vinylidene fluoride) film during its aging”, Results in Materials, 9:100163 (2021)

[5] Kudryavtsev Yu. P., Evsyukov S. E., Babaev V. G., “An efficient dehydrofluorinating system for polyvinylidene fluoride”, Bulletin of the Russian Academy of Sciences Division of Chemical Science, 41 (1992), 966–967 | DOI

[6] Golub P., Doroshenko I., Pogorelov V., Sablinskas V., Balevicius V., Ceponkus J., “Temperature evolution of cluster structures in ethanol”, Dataset Papers in Physics, 2013 (2013), 473294

[7] Socrates G., Infrared and Raman Characteristic Group Frequencies: Tables and Charts, John Wiley Sons Inc., Hoboken, 2004 | MR

[8] Stuart B. H., Infrared Spectroscopy: Fundamentals and Applications, John Wiley Sons Inc., Hoboken, 2004 | MR