Polymerization of ethylene methyl phosphate in the presence of sodium poly(ethylene glycol)ate

Poly(ethylene methyl phosphate)-poly(ethylene glycol)-poly(ethylene methyl phosphate) triblock copolymers carrying hydroxyl group at both chain ends w ere synthesized with sodium poly(ethylene glycol)ate as initiator. The effe cts of the factors such as solvent, amount of the initiator and reaction ti me were investigated. The copolymers were characterized by IR, H-1-NMR, H-1 {P-31}-NMR, C-13-NMR, P-31{H-1}-NMR, and DSC. High molecular weight of the copolymer and high yield of the polymerization were achieved within 3 min a t 25 degrees C. The polymerization process was studied by P-31{H-1}-NMR and transesterification was found during longer polymerization time.