采用升温淋洗分级(TREF)方法对高模量聚丙烯管材料进行了分级,并应用凝胶渗透色谱(GPC)、傅立叶变换红外光谱(FT-IR)、结晶淋洗分级(CEF)和差示扫描量热(DSC)等方法研究了其组成、序列结构与相对分子质量及分布。结果表明:材料由高规整度的均聚聚丙烯、含有少量乙烯链段的聚丙烯、含乙烯和丙烯长链段的乙丙共聚物和乙丙无规共聚物组成。均聚聚丙烯相含量最高,为材料的主要组成部分,提供了材料的刚性;乙丙无规共聚物组分分子量较大且分布较宽,构成了材料的橡胶相,保证了材料的抗冲强度;含乙烯和丙烯长链段的共聚物含量较低,但对材料性能的提高起到了重要作用。
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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