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Authors Lappan, U. ; Geißler, U. ; Scheler, U.
Title Chemical Structures Formed in Electron Beam Irradiated Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP)
Date 10.08.2006
Number 13767
Abstract The perfluorinated copolymer poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) was electron beam irradiated under vacuum at various temperatures ranging from room temperature to a temperature above the melting temperature of FEP. Changes of the chemical structure were analyzed by 19F solid-state NMR and IR spectroscopy. Trifluoromethyl end groups were generated as a result of main chain scission at all irradiation temperatures studied. In addition, trifluoromethyl side groups in various environments and double bond structures were formed. Quantitative analysis showed that long-chain branches were formed at irradiation temperatures above 200 °C. Furthermore, the hexafluoropropylene (HFP) units in FEP were found to be less sensitive to radiation than the perfluoropropyl vinyl ether (PPVE) units in poly[tetrafluoroethylene-co-(perfluoropropyl vinyl ether)] (PFA).
Publisher Macromolecular Materials and Engineering
Wikidata
Citation Macromolecular Materials and Engineering 291 (2006) 937-943
DOI https://doi.org/0.1002/mame.200600143
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