| Autor: |
Zhivulin, V. E., Evsyukov, S. E., Chalov, D. A., Morilova, V. M., Andreychuk, V. P., Khairanov, R. Kh., Margamov, I. G., Pesin, L. A. |
| Zdroj: |
Journal of Surface Investigation: X-Ray, Synchrotron & Neutron Techniques; Oct2022, Vol. 16 Issue 5, p673-681, 9p |
| Abstrakt: |
Changes in the molecular composition of the F-2ME poly(vinylidene fluoride) film during its chemical dehydrofluorination and subsequent aging are studied by infrared (IR) spectroscopy, scanning electron microscopy, and X-ray diffraction. The byproducts of chemical reactions are also identified. An increase in the reaction time from 10 to 40 min leads to an increase in the thickness of the samples, the concentration of double carbon–carbon bonds and ethoxy groups, as well as to an increase in the absorption peak centered at 3100 cm–1 presumably associated with stretching vibrations of =C–H bonds at the double carbon–carbon bond. Seven days after synthesis new peaks at 1840 and 2040 cm–1 appear in the sample spectra and begin to grow. Their intensities are proportional to each other and are greater the longer is the synthesis duration. Both features are characteristic of the IR spectrum of potassium hydrofluoride. Changes in the IR absorption spectra after a year of storing the samples in air and after additional washing of the sample with a synthesis duration of 40 min in a mixture of acetone and distilled water after 467 days of storage are analyzed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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