Ozone and the Goliath

Quantum chemical calculations reveal that ozone (~100ppbv) is capable of instigating a series of degradative processes in poly(methyl methacrylate). The crux lies in the self-decomposition of 1,2,4-trioxolane, which undergoes a spin intersystem crossing process through the Minimum Energy Crossing Point (MECP) and O-O bond cleavage to unravel a triplet biradical intermediate that facilitates auto-degradation of the polymer chain. This
process which is 33 times more efficient than normal degradation in air suggests competitive damage by ozone to acrylates despite its very low concentration!

Updated:  20 September 2017/Responsible Officer:  Director, RSC/Page Contact:  Web Admin, RSC