Effects of Electron Beam Irradiation on Polyethylene 2,6-naphthalate)/Poly(ethylene terephthalate)Blends

摘要

The effect of electron beam(EB)irradiation on the properties and compatibility of polyethylene 2,6-naphthalate)(PEN)/poly(ethylene terephthalate)(PET)blends was investigated.Upon EB irradiation,PEN/PET blends underwent transesterification reactions,resulting in the formation of more random copolymers from the original binary pair.The degree of transesterification increased with dose rate,and all of the irradiated blends exhibited a single glass transition temperature.This indicated that transesterification reactions promoted by EB irradiation led to the formation of a single phase.Transesterification reactions promoted by EB irradiation led to more random copolymers,and the reduced regularity in the irradiated blends decreased the melting temperature.A higher degree of randomness and lower number-aver age sequence lengths for the blend systems indicated that a more random chain structure was formed in the blends.The rheological measurements demonstrated that the irradiated PEN/PET blends were miscible.EB irradiation could promote transesterification reactions,thus enhancing the compatibility of PEN/PET blends.