Abstract
To elucidate the radical-scavenging effects of vitamin E, we studied the polymerization of methyl methacrylate in the presence of vitamine E and its related compounds(BHT:2, 6-Di-tert-butyl-4-methylphenol and phenol)by BPO at 70℃ using DSC.Induction period and initial rate of polymerization(IRP)were determined from time-conversion curves derived from DSC thermogram.The induction period of phenolic compounds in the BPO system was dependent on the concentration.As the concentration increased, the induction period increased.Its values decreased in the order:BHT>phenol>vitamin E.Compared to phenol, IRP of vitamin E markedly decreased as the concentration increased.It was concluded from this that vitamin E is a retarder.The IRP of BHT was not changed at the range of 0-0.1mole%, indicating that BHT was an efficient inhibitor.In the azobisisobutyronitrile(AIBN)system, the induction period decreased in the order:vitamin E>BHT>phenol.Vitamin E interacted strongly with radicals generated by AIBN.
