EPR study of the reactivity of peroxy radicals trapped in polytetrafluoroethylene

Journal Article · Sat Mar 01 04:00:00 EST 1980 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.439519· OSTI ID:5622327

Olivier, D; Marachi, C; Che, M

The effect of CO, C/sub 2/H/sub 4/, SO/sub 2/, and /sup 17/O/sub 2/ on the EPR spectrum of peroxy chain radicals (R--CF/sub 2/--CFOO/sup ./--CF/sub 2/R') and of peroxy propagating radicals (R''--CF/sub 2/OO/sup ./) of polytetrafluoroethylene (PTFE) has been investigated. The peroxy chain radicals appear chemically stable up to 100 /sup 0/C while in the same conditions, the peroxy propagating radicals do react. The transformation of peroxy propagating radicals always takes place through the rupture of the C--O bond. In the reaction with SO/sub 2/, evidence is presented for the formation of R''--CF/sub 2/--SO/sub 2//sup ./ radical with g/sub x/x=1.999, g/sub y/y=2.011, g/sub z/z=2.005 at 77 K and g/sub parallel/=2.007, g/sub perpendicular/=2.002 at 300 K. The temperature dependence of the EPR spectra is analyzed in view of the rotational freedom in the polymer. The R''--CF/sub 2/--SO/sub 2//sup ./ undergoes rotation around the polymer chain axis. From these data the structure of the radical is discussed.

• Research Organization: Laboratoire de Chimie des Solides, ER 133, CNRS, Universite P. et M. Curie, 4 Place Jussieu, 75230 Paris, Cedex 05, France
• OSTI ID: 5622327
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 72:5; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
FLUORINATED ALIPHATIC HYDROCARBONS
GAMMA RADIATION
HALOGENATED ALIPHATIC HYDROCARBONS
IONIZING RADIATIONS
MAGNETIC RESONANCE
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
PEROXY RADICALS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
RESONANCE
STABILITY
TEFLON
TEMPERATURE DEPENDENCE