E.s.r. study on permeation of oxygen in crosslinked polymers

Polymeric networks of methyl methacrylate (MMA)/ethylene glycol dimethacrylate (EGDMA) with various EGDMA levels were synthesized via bulk free-radical polymerization using an AIBN initiator and a programmed temperature rise. The trapped radicals in the polymer network were used to investigate the permeation of oxygen by electron spin resonance (e.s.r.). The decay rates of radical concentration in the temperature range, 110 to 180°C were used …