Abstract: The high modulus polypropylene pipe material was fractionated by temperature rising elution fraction(TREF).The composition,sequence structure,and molecular weight and distribution were studied by gel permeation chromatography(GPC),flourier transform infrared spectroscopy(FT-IR),crystallization elution fractionation(CEF) and differential scanning calorimetry(DSC).The results indicated that the resin was composed of high regularity homo-polypropylene,polypropylene with a small amount of ethylene segment,ethylene-propylene copolymer with long segment of ethylene and propylene and ethylene-propylene random copolymer.Homo-polypropylene had the largest amount and it was the main component,which provided the rigidity of the material.Ethylene-propylene random copolymer constituted rubber phase of the resin and ensured impact strength,which had large molecular weight and broad distribution.The copolymers with long segment of ethylene and propylene had low content,but they played an important role in improving the properties of materials.
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2019, Vol. 47 
