Abstract: The compatibility, thermal properties, mechanical properties and barrier properties of the blends of PP/poly (ethylene-co-vinyl alcohol) (EVOH) containing three kinds of compatilizers(PP-g-AA, PP-g-ITA and PP-g-MAH) were investigated. Infrared spectra analysis indicated that the improvement of compatibility was resulted from the formation of ester bonds and hydrogen bonds between compatilizers and EVOH. Scanning Electron Microscopy observations showed that the presemce of compatilizers in the PP/EVOH blends reduced the size of the dispersed phase. Differential scanning calorimetry analysis showed that the compatilizers lowered the crystallization temperature of dispersed EVOH phase, but increased that of PP phase. Compared with the uncompatibilized blends, the tensile strength of the compatibilized blends was increased by10 MPa, and the oil absorption rate was decreased by 0.8 %.

Key words: polypropylene, poly (ethylene-co-vinyl alcohol), blends, structure, property