Radical concentrations in free radical copolymerization of MMA/EGDMA

Radical concentration histories for the bulk free radical copolymerization of methyl methacrylate (MMA) and ethylene glycol dimethacrylate (EGDMA) initiated with 0.3 wt% 2,2'-azobis(2-methyl-propionitrile) (AIBN) at 70°C over the entire composition range were measured with an on-line electron spin resonance spectrometer. Radical concentrations of 10−7−10−3moll−1 were observed. At high EGDMA levels, the radical concentration increases …