Stability of heterocharges in poly(methyl methacrylate) thermoelectrets. II. Effect of. gamma. -irradiation on thermally stimulated current spectra

Journal Article · Wed Feb 01 00:00:00 EST 1978 · J. Polym. Sci., Polym. Phys. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1978.180160204· OSTI ID:7095511

Vanderschueren, J; Linkens, A

Thermally stimulated currents (TSC) of ..gamma.. irradiated poly(methyl methacrylate) thermoelectrets have been investigated in the high-temperature range. The two main peaks of the TSC spectrum, appearing, respectively, at about 100 (..cap alpha..) and 120/sup 0/C (rho), show marked differences in stability under iradiation: while the ..cap alpha.. peak is little affected by doses up to 10/sup 7/ rad, the rho peak vanishes following doses of 10/sup 5/ to 10/sup 6/ rad. On the other hand, a study of the rate of decrease of the rho peak as a function of irradiation conditions reveals the important role of the surrrounding atmosphere and the existence of a flux effect, probably related to irradiation-accelerated diffusion of gas into the polymer. All these facts confirm the respective attributions of ..cap alpha.. and rho peaks to a dipolar volume polarization and to an ionic space charge polarization, showing that the TSC study of irradiated thermoelectrets can be a useful method for identification of polarization processes in polymers.

• Research Organization: Univ., Liege
• OSTI ID: 7095511
• Journal Information: J. Polym. Sci., Polym. Phys. Ed.; (United States), Vol. 16:2
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
36 MATERIALS SCIENCE
ELECTRETS
RADIATION EFFECTS
POLYACRYLATES
GAMMA RADIATION
MEDIUM TEMPERATURE
POLARIZATION
SPECTRA
STABILITY
DIELECTRIC MATERIALS
ELECTROMAGNETIC RADIATION
ESTERS
IONIZING RADIATIONS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYVINYLS
RADIATIONS
400600* - Radiation Chemistry
360406 - Materials- Polymers & Plastics- Radiation Effects- (-1987)