The effect of addition of different elastomers upon the crystalline natureof PP

Thermal and morphological studies have been performed on polymer blends bas ed on ethylene-octene copolymer (PEE)/PP and ethylene-propylene-diene copol ymer (EPDM)/PP. The thermal and morphological behavior of PEE, EPDM, PEE/ P P, and EPDM/PP systems were analyzed by differential scanning calorimetry ( DSC) and polarizing light microscopy, respectively. It was observed that th e behaviors of crystallization kinetics of PEE/PP and EPDM/PP blends were s imilar. It was also observed that addition up to 10-20% (w/w) of elastomers resulted in increasing of spherulite size. The heat of fusion (DeltaH(f)) and crystallinity degree of PEE/PP and EPDM/PP systems decreased when the e lastomer contents were increased. (C) 2001 John Wiley & Sons, Inc.