Abstract: Three kinds of high flow ability and impact copolymer polypropylene were characterized using differential scanning calorimeter, thermogravimetric analyzer and dynamic mechanical analyzer. It was found that the width of half height of crystallization for HHP10 was narrower, the crystallization rate was larger, the quantity of stereo-defects was greater, and the oxidation induction time was obviously shorter than AP03B and K7726. The heat resistance of 7726 was superior to and the samples HHP10 and AP03B. AP03B possessed the highest glass transition temperature, best impact strength. The compatibility of polypropylene matrix and ethylene propylene rubber in K7726 was the best. HHP10 gave the best storage modulus and rigidity.

Key words: highly impact polypropylene copolymer, high flowability, themal behavior, dynamic mechanical preperty