POLYMERIZATION OF DIETHYLENE GLYCOL BIS(ALLYL CARBONATE) AT 85-DEGREES-C

The polymerization of diethylene glycol bis(allyl carbonate) initiated by benzoyl peroxide has been studied at 85°C. The time dependence of conversion of double bonds has been monitored by near infrared spectroscopy and that of the radical concentration by electron spin resonance spectroscopy. The dominating radical species in the early stages of the polymerization is the ally radical. Its concentration remains small (approx. 5 × 10-7 mol dm-3) until the conversion of double bonds rises to about 45%. Beyond this conversion, the spectrum changes in shape and the radical concentration increases. The results suggest that the allyl radicals play an important role in this polymerization, especially in the low conversion region. © 1990.