On the radiation induced degradation of NBR–EPDM rubbers

Degradation of Silicone Rubber under AC or DC Voltages in Radiation Environment

“…The experimental conditions must be carefully chosen and must be representative of the real aging. Accelerated aging is usually done by applying higher temperature, dose or dose rate [17]. For accidental radiation conditions, where the dose rate is sufficiently high, the most representative test is the real radiation one with high dose or dose rate [18].…”

“…In Electricite' De France laboratory, cables and pieces of electrical equipments have been aged under normal and accidental conditions. To simulate normal ageing under gamma radiation, qualification standards (IEC-60544) of electrical equipments recommend the application of only one dose rate between 100 and 100000 Gy/h [20].The mechanical properties of irradiated silicone rubber and ethylene propylene diene monomer rubber has been investigated at dose rates of 0.14 and 0.47 kGy/h [17,19]. Hence, to study the performance of silicone rubber, under accelerated aging conditions, the higher dose rate of 0.51 kGy/h which was available at Indira Gandhi Center for Atomic Research (IGCAR) Laboratory was selected.…”

“…The actual dose rate which the organic insulating materials receive in practice is almost 1 Gy / h in the primary containment vessel of a typical light water reactor [15,16].Ethylene propylene diene monomer and SR elastometers are frequently used to produce seals, hoses and electrical insulators in nuclear power plants [17]. Investigations have been carried out to study the radiation-induced degradation of mechanical properties of electrical insulating materials used in nuclear environments [17,18,19,20]. The radiation-induced degradation in percentage elongation at break of EPDM-NBR rubbers has also been studied at different integral doses between 2 to 200 kGy [17].…”

“…Investigations have been carried out to study the radiation-induced degradation of mechanical properties of electrical insulating materials used in nuclear environments [17,18,19,20]. The radiation-induced degradation in percentage elongation at break of EPDM-NBR rubbers has also been studied at different integral doses between 2 to 200 kGy [17]. Aging of silicone rubber polymers used in electrical equipments in nuclear power plants was studied at different dose rates, with tensile strength as the main parameter for investigation [19].…”

Kinetic considerations on the mechanical behaviour of polypropylene + wood flour and polypropylene + sisal fibre blends

“…According to Chipara et al [4,5], a different behaviour can be observed in both matrix and filler, such as degradation and cross-linking during irradiation, which can be represented by means of the following processes:…”