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Radiation-induced macroradical reactions in poly(methyl methacrylate) at high pressures

Journal Article · · High Energy Chem. (Engl. Transl.); (United States)
OSTI ID:5905703
; ; ; ;
It is shown in this article that high pressures (up to about 2 GPa) do not influence the yields of macroradicals produced in poly(methyl methacrylate) under irradiation. The primary radicls are produced by breakage of C-H bonds. The macroradical accumulation kinetics at doses up to 2 kGy and high pressures would indicate preferential macroradical formation at defects in the polymer matrix containing dissolved oxygen molecules. At high pressures, the peak on the radical accumulation curve vanishes, although one is observed at 300/sup 0/K and normal pressure, which is ascribed to reduction in the macroradical recombination rate in the region of the initial defects.
Research Organization:
Karpov Physical Chemistry Institute
OSTI ID:
5905703
Journal Information:
High Energy Chem. (Engl. Transl.); (United States), Journal Name: High Energy Chem. (Engl. Transl.); (United States) Vol. 19:1; ISSN HIECA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360406* -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
ALKYL RADICALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COBALT 60
COBALT ISOTOPES
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
ESTERS
GAMMA RADIATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
IRRADIATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KINETICS
MAGNETIC RESONANCE
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PEROXY RADICALS
PMMA
POLYACRYLATES
POLYMERS
POLYVINYLS
PRESSURE EFFECTS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOISOTOPES
RADIOLYSIS
REACTION KINETICS
RECOMBINATION
RESONANCE
TEMPERATURE EFFECTS
YEARS LIVING RADIOISOTOPES