Synthesis and properties of poly(ethylene oxide)-grafted polyethylene copolymer and terpolymer

摘要

A series of graft copolymers were synthesized based on ethylene-co-m, p-methylstyrene (EMS) (backbone copolymer), ethylene-1-hexene-m, p-methylstyrene (EHMS) (backbone terpolymer), and polyethylene glycol monomethyl ethers (PEGM) (grafts) in this study. The PEGMs with molecular weights of 750 and 2000 were used. The chemical composition of the graft copolymers was analyzed by NMR and DSC measurements. The graft copolymers exhibited a phase-separated morphology with the backbone and the methoxy polyethylene glycol (MPEG) grafts forming separate crystalline phases. The MPEG phase had a melting temperature lower than the corresponding MPEG homopolymer, as determined by DSC. The melting point of the crystalline phase formed by the EMS and EHMS main chains was lower than that of pure polymer backbone.