Title :
Irradiation effects on synthetic polymers (EPR, EPDM) in salt solutions. IV. Stability evaluation by oxygen uptake
Author :
Zaharescu, T. ; Mihalcea, I.
Author_Institution :
Res. & Design Inst. for Electr. Eng., Bucharest, Romania
Abstract :
Ethylene-propylene samples (EPR and EPDM) were irradiated in NaCl solutions. They achieved a high stability at about 150 kGy. Oxygen uptake measurements pointed out that chemical stability against oxidation is changed with dose and salt concentration. Simultaneous processes (crosslinking and oxidative degradation) are considered. Time dependence curves of absorbed oxygen emphasize that alkyl radicals could react with oxygen and crosslinked bulk would be degraded afterwards. The most significant effect of radiation on tested elastomer samples was, obtained for 0.1%NaCl concentration. During these experiments additional effect of radiolysis products is overlapped on radiation action. Some mechanistic aspects of polymer radiation processing are discussed relative to various applications as dielectric materials
Keywords :
ethylene-propylene rubber; gamma-ray effects; insulation testing; oxidation; polymer blends; radiolysis; sorption; surface chemistry; EPDM; EPR; NaCl; NaCl solutions; absorbed oxygen; alkyl radicals; chemical stability; crosslinking; dose dependence; elastomer samples; ethylene-propylene samples; high stability; irradiation effects; oxidation; oxidative degradation; oxygen uptake; polymer radiation processing; radiolysis products; salt concentration; salt solutions; stability evaluation; synthetic polymers; time dependence curves; Chemical processes; Degradation; Dielectric devices; Dielectric materials; Oxidation; Oxygen; Paramagnetic resonance; Polymer gels; Stability; Testing;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1995. ICSD'95., Proceedings of the 1995 IEEE 5th International Conference on
Conference_Location :
Leicester
Print_ISBN :
0-7803-2040-9
DOI :
10.1109/ICSD.1995.523045
