1. Surface Energy Characteristics of Polytetrafluoroethylene Bombarded with MeV Protons.
- Author
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Shaimukhametova, I. F., Allayarov, S. R., Bogdanova, S. A., Belov, G. P., Semavin, K. D., Demidov, S. V., and Dixon, D. A.
- Subjects
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POLYTEF , *SURFACE energy , *FREE energy (Thermodynamics) , *CRYSTALLINITY , *DISPERSION (Chemistry) , *PROTONS , *FUNCTIONAL groups , *IRRADIATION - Abstract
Energy characteristics of the irradiated surface of a polytetrafluoroethylene film depend on the energy and fluence of bombarding MeV protons. Irradiation with 2-4 MeV protons leads to an increase in the surface free energy; 4 MeV protons at a fluence of 1015 proton/cm2 increase the polarity of the polymer surface by 40 times due to the appearance of functional groups, the polarity enhancement being manifested in an increase in the acid-base component of the surface energy by more than a factor of 50. There is a correlation between the dispersion component of the surface energy and the degree of crystallinity of the near-surface layer of the polymer a period. They both grow symbatically in the case of bombardment with 1-2 MeV protons and decrease upon irradiation with 4 MeV protons. It has been found that dehydrofluorination results in carbonization of the irradiated surface, a decrease in the fluorine content, and an increase in the proportion of oxygen due to oxidation of the radicals generated by proton bombardment. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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