The compatibilizing effect of a new graft copolymer of poly(ethylene glycol) (PEG) on nylon 6 (nylon 6-g-PEG) was investigated for nylon 6/poly(vinyl acetate) (PVAc) blends by using melting-point depression and X-ray diffractograms. It was found that nylon 6-g-PEG exhibits no compatibilizing effect for the nylon 6/PVAc blends, but the graft copolymer itself shows a miscibility window in its blends with PVAc for blend compositions containing less than 50 wt% of the graft copolymer.