Elementary radical formation and conversion processes in. gamma. -irradiated polyvinylchloride
Elementary processes of ..gamma..-irradiated polyvinylchloride (PVC) have been investigated by both electron spin resonance (ESR) and optical absorption measurements. On irradiating PVC film with ..gamma.. rays at -196/sup 0/C, alkyl-type radicals are produced. When the PVC film is warmed to room temperature, the radicals convert to polyenyl type. ..gamma.. irradiation of PVC film containing biphenyl (Ph/sub 2/) or pyrene (Py) at -196/sup 0/C yields the corresponding radical cation. The relative ESR peak heights of the radicals decrease and the G values for the formation of cation radicals increase with increasing additive concentrations. These facts indicate that energy is transferred from the precursor of the radicals to the additive. In the case of PVC film containing Py, the Py cation radical decreases the cyclohexadienyl-type radical from Py is produced by thermal annealing. A possible mechanism for radical formation and conversion is proposed.
- Research Organization:
- Nagoya Univ., Japan
- OSTI ID:
- 6369299
- Journal Information:
- J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 19:11; ISSN JPLCA
- Country of Publication:
- United States
- Language:
- English
Similar Records
ESR study of DNA base cation radicals produced by attack of oxidizing radicals
Thermal and photo-induced phenomena in $gamma$-irradiated poly(methyl methacrylate)
Related Subjects
360406 -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
ADDITIVES
AROMATICS
BIPHENYL
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
CHLORINATED ALIPHATIC HYDROCARBONS
CONDENSED AROMATICS
DATA
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
G VALUE
GAMMA RADIATION
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INFORMATION
IONIZING RADIATIONS
IONS
KINETICS
LOW TEMPERATURE
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYVINYLS
PVC
PYRENE
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
REACTION KINETICS
RESONANCE
SPECTRA
SPECTROSCOPY
TEMPERATURE DEPENDENCE