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Chemical Structures Formed in Electron Beam Irradiated Poly(tetrafluoroethylene‐ co ‐hexafluoropropylene) (FEP)
Author(s) -
Lappan Uwe,
Geißler Uwe,
Scheler Ulrich
Publication year - 2006
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200600143
Subject(s) - hexafluoropropylene , tetrafluoroethylene , materials science , trifluoromethyl , irradiation , copolymer , polymer chemistry , ether , solid state nuclear magnetic resonance , alkyl , organic chemistry , polymer , chemistry , nuclear magnetic resonance , composite material , physics , nuclear physics
Summary: 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 19 F 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).19 F solid‐state NMR spectra of FEP.