Abstract
In this work, a non-edible natural ester oil (NEO) is considered for the study for its aging characteristics by the frequency-domain spectroscopy (FDS). The NEO considered is the Jatropha Curcas oil (JAT) because of its non-edible and biodegradable nature. The FDS method is a non-destructive measurement technique which is used to analyze the characteristics of the JAT oil by obtaining the relative permittivity and dielectric dissipation factor (DDF) over a wide range of frequencies. The NEO is subjected to thermal stress in an open beaker aging test setup at 115 °C for up to 500 h, and after every of 100 h of aging, the samples are taken out for testing. This technique is applied to understand the dielectric response of the oil at different aging durations. Fourier transform infrared spectroscopy and ultraviolet visible spectroscopy analyses are implemented before and after aging, to observe the alterations in the structure of the two oil samples. The FDS results show how the dielectric properties of JAT vary under aging and help understand the phenomenon behind the degradation at lower frequencies. The variation in the dielectric properties was analyzed by regression models for a quantitative outlook to aging in the oil samples and an associative relationship is established among the parameters.
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