Abstract
In this work the effect of gamma irradiation on two commercial poly(ether-urethane)s of different hard segments, namely Pellethane and Tecoflex was investigated. Electron Paramagnetic Resonance (EPR) spectroscopy was used because it is the only technique appropriate for direct detection and identification of paramagnetic intermediates in the irradiated substances. Thermal annealing was applied to compare the relative stability of the detected radicals.It was found that the dominant component of EPR spectra is a doublet which was assigned to diphenylmethyl radical in Pellethane and dihexylmethyl radical in Tecoflex, formed by the abstraction of hydrogen atom from –CH2- group located between aromatic and cyclohexane rings, respectively. The other paramagnetic product present in the wide range of temperatures is alkyl radical –CH2-CH2• localized in both segments of polyurethanes, presumably formed by scission of C–O bond.The performed studies will allow to predict radiation susceptibility of polyurethanes designed in the future.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
