塩素化EPDMとリビングポリマーの反応

概要

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A graft polymer was prepared using the coupling reaction of chlorinated ethylene-propylene terpolymer with living polystyrene obtained with a sodium-naphthalene complex initiator in tetrahydrofurane at 30°C., and the grafting efficiency and the grafting percentage were discussed.<BR>The dried reaction product was extracted with boiling acetone to determine the weight of grafted polystyrene. The grafting was confirmed by fractionation and from infrared spectra.<BR>The grafting efficiency at the constant living polystyrene concentration, increased with increase in the concentration of the chlorinated ethylene-propylene terpolymer and it approached an equlibrium value (37-39 %) when the ratio of chlorine to sodium in the initiator used to polymerize styrene, was unity.<BR>At the constant concentrations of chlorinated ethylene-propylene terpolymer and living polystyrene, grafting percentage increased with increase in the degree of polymerization of living polystyrene. Crosslinking occurred during the coupling reaction and insoluble graft polymers were obtained.
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