Synchrotron radiation (5--50 eV) induced degradation of fluorinated polymers

Journal Article · Sun May 01 04:00:00 EDT 1994 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

DOI:https://doi.org/10.1116/1.578853· OSTI ID:7274021

Simons, J K ^[1]; Frigo, S P ^[2]; Taylor, J W ^[3]; Rosenberg, R A ^[4]

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1. Synchrotron Radiation Center and Department of Chemistry, University of Wisconsin-Madison, Stoughton, Wisconsin 53589-3097 (United States)
2. Synchrotron Radiation Center and Department of Physics, University of Wisconsin-Madison, Stoughton, Wisconsin 53589-3097 (United States)
3. Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
4. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

The photochemistry of solid, free-standing films of poly(tetrafluoroethylene) (PTFE) and poly(hexafluoropropylene--tetrafluoroethylene) (FEP) was investigated by monitoring the neutral photodesorption products produced upon irradiation with synchrotron radiation (5--50 eV). CF[sub 3], C[sub 2]F[sub 5], C[sub 3]F[sub 5], C[sub 3]F[sub 7], and C[sub 4]F[sub 7] were the predominant species observed in the mass spectra of the irradiated polymers. Oligomers at least as large as 293 amu (C[sub 7]F[sub 12]) were also detected. Distinct differences are observed in the photodesorption yields and time responses of the yields based on the energy of the initial excitation. An edge jump at 22 eV in the photon-stimulated desorption spectra of both PTFE and FEP films is assigned to the ionization of the C(2s) states of the polymers. The energy dependence of the photodesorption yields is accounted for by considering two separate reaction pathways.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7274021
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 12:3; ISSN 0734-2101; ISSN JVTAD6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360605* -- Materials-- Radiation Effects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
BREMSSTRAHLUNG
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ENERGY DEPENDENCE
ENERGY RANGE
EV RANGE
EV RANGE 10-100
FILMS
FLUORINATION
HALOGENATION
PHOTOCHEMICAL REACTIONS
PHYSICAL RADIATION EFFECTS
POLYMERS
RADIATION EFFECTS
RADIATIONS
SYNCHROTRON RADIATION