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Authors Lappan, U. ; Geißler, U. ; Scheler, U. ; Lunkwitz, K.
Title Identification of new chemical structures in poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) irradiated in vacuum at different temperatures
Date 03.06.2003
Number 10848
Abstract Electron beam irradiation of perfluorinated copolymer poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) was carried out in vacuum at different temperatures between room temperature and temperature above the melting point of PFA. Changes of chemical structure were studied by <sup>19</sup>F solid-state NMR and IR spectroscopy. Chain scissions and branching reactions occur simultaneously, which are indicated by formation of CF<sub>3</sub>, COF and COOH end groups, CF branching points and CF<sub>3</sub> side groups. Branching density based on concentration of CF groups increases with increasing temperature. Formation of cross-links is concluded for PFA irradiated in molten state. Perfluoropropyl vinyl ether (PPVE) units are found to be more sensitive to radiation than tetrafluoroethylene units. COF and COOH groups are assumed to result from PPVE degradation.
Publisher Radiation Physics and Chemistry
Wikidata
Citation Radiation Physics and Chemistry 67 (2003) 447-451
DOI https://doi.org/10.1016/S0969-806X(03)00083-5
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