To put this into context, in a thermo-oxidatively aged NR study, the -CH2stretching vibration demonstrated peak retention, contrary to the observation made in the present work. In UV radiation (only) induced measurements, dos Santos et al. summarize the formation of different groups in polyisoprene (cis, trans, and NR) subjected to various wavelengths. It was concluded that apart from the wavelength, the type of isomer and the pre-condition (presence of groups characteristic of partial oxidation) of the polymer dictate the effects of UV.