Structure, thermal, optical and electrical investigation of the effect of heavy highly energetic ions irradiations in Bayfol DPF 5023 nuclear track detector

摘要

The effects of 28 GeV ~(56)Fe ion irradiation on the structural, thermal, optical and electrical properties of Bayfol DPF 5023 have been investigated. Samples from Bayfol sheets have been irradiated using different Fe fluences in the range 1 x 10~(12) to 5 x 10~(15) ion/cm~2. The total energy deposited is between (28 x 10~921) eV and 14 x 10~(25) eV). The resultant effect of Fe ion irradiation on the properties of Bayfol has been investigated using FTIR spectroscopy, intrinsic viscosity, Thermogravimetric Analysis TGA, refractive index, color changes, and DC conductivity. The results indicate that the Fe ion irradiation in the fluence range 10~(12)-10~(15) ion/cm~2 led to a more compact structure of Bayfol polymer, which resulted in an improvement in its thermal stability with an increase in activation energy of thermal decomposition and crosslinking. This crosslinking enhanced the intrinsic viscosity of Bayfol from 0.58 to 0.89 at 35 °C, indicating an increase in the average molecular mass. This was accompanied with an increase in refractive index. Further, the transmission of Bayfol samples in the wavelength range of 370-780 nm, as well as any color changes, was studied. The color intensity AE was increased with increasing the Fe fluence, and was accompanied by a significant increase in the blue color component.