Fig. 5 Correlation between LSO self-diffusion and Tail T2 at 25, 40, 60, 80, 100, 120oC during 168 h. (25 and 40oC designated as Slow Ox and 60, 80, 100, 120oC designated as Rapid Ox)
In summary we have shown that the T2 (spin-spin) transversal relaxation time of the alkyl chain tail reflects the chemical and structural changes occurring during LSO aging via a thermal autoxidation process. In effect, T2 can be correlated to the kinetics of oxidation as influenced by the temperature, and can be correlated as we show, to chemical changes such as covalent crosslinking polymerization, and peroxide and aldehyde formation and changes in component concentrations such as PUFA, MUFA and SAT) and different material properties such as viscosity and diffusivity.