Akademik Veri Yönetim Sistemi
Radiation Physics and Chemistry, cilt.202, 2023 (SCI-Expanded)
© 2022 Elsevier LtdThe aim of this work was to determine the effects of radiation on the mechanical, stress softening, energy dissipation, and damping properties of vinyl-methyl-polysiloxane (VMQ) elastomers cured with a platinum catalyst. Firstly, the silicone mixture was prepared using a commercially available two-component platinum catalyst then the curing behavior was investigated using a moving die rheometer and optimum curing conditions were determined. Secondly, cured silicone elastomers were irradiated with electron beams with doses of 0–100 kGy. After the irradiation process, the effect of ionizing radiation on the mechanical properties was examined. For this purpose, the stress-strain behaviors of the samples were investigated and the tensile strength at break, elongation at break, and elastic modulus values were determined. By utilizing the swelling behavior of the elastomers, the crosslink densities of irradiated and non-irradiated samples were calculated, and it was found that ionizing radiation increased the crosslink density of platinum-cured VMQ (Pt-VMQ) elastomers and improved their mechanical properties. In order to examine the effect of ionizing radiation on the mechanical properties, cyclic uniaxial compression analyses were performed at static conditions and the stress softening or Mullins effect, energy dissipation, and damping properties of Pt-VMQ elastomers were determined. To determine the effect of radiation on the dynamic mechanical properties, the variation of the transmissibility, natural and damping frequency, and tan delta were examined with 40 and 80 kGy irradiated elastomers. All mechanical results reported in this study demonstrate that the absorbed dose is an important parameter for controlling the permanent deformation, energy dissipation, and vibration-damping properties of Pt-VMQ elastomers, and with the increase in crosslinking the permanent deformation and mechanical properties increase, while the damping properties decrease slightly.