THE CHEMICAL REACTIONS OCCURRING DURING MELT MIXING OF PBT AND LDPE MODIFIED BY GRAFTING OF DIBUTYLMALEATE
PBT 和马来酸二丁酯接枝的 LDPE 熔融共混体系中的化学反应

Binary blends of poly(butylene terephthalate)(PBT) and low densitypolyethylene(LDPE)or functionalized LDPE copolymer with dibutylmaleate(LDPE-g-DBS)have been prepared by melt mixing.Morphological analysis of smoothedspecimen,solubility separation and infrared analysis of separated specimen,thermal analy-sis as well as dynamic mechanical determination have been performed on all the blends.Ithas been shown that during melt mixing the interchange reaction occurs and a(LDPE-g-DBS)-g-PBT graft copolymer is formed,which acts as an interfacial agent be-tween the polyethylene dispersed phase and the polyester matrix in blends,and that the in-terchange reaction is effected by degree of grafting of LDPE-g-DBS,mixing time andamount of catalyst.