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采用具有不同特性粘数的宽分布乙烯-丙烯共聚物(以下简称EP共聚物)为标样,应用普适标定曲线,以试误法来订定Mark-Houwink方程的参数K和α值。结果得到K同EP共聚物的组成和口值之间的关系式:logK=log(5.755-4.65C_3)-5.75α,式中C_3是EP共聚物的丙烯摩尔百分数,α可取0.73—0.755之间任一数值(即K和α不是独立的)。用普适标定曲线从GPC谱图计算的特性粘数或分子量与用粘度计,光散射和膜式渗透计的测定值此较,符合的较好。此外,还用柱上淋洗分级法得到EP共聚物的级分来订定K、α值,做为参考。
Using the broad-distribution ethylene-propylene copolymer (hereinafter referred to as EP copolymer) with different intrinsic viscosities as the standard sample, the universal calibration curves were used to determine the parameters K and α of the Mark-Houwink equation by trial and error. The results obtained K with EP copolymer composition and the value of the relationship between the mouth: logK = log (5.755-4.65C_3) -5.75α, where C_3 is the propylene copolymer propylene copolymer mole percent, α desirable between 0.73-0.755 Either value (ie K and α are not independent). The intrinsic viscosities or molecular weights calculated from the GPC chromatogram using a universal calibration curve are in good agreement with those measured with a viscometer, light scattering and a membrane permeation meter. In addition, the fraction of EP copolymer was also fractionated by column leaching grading to determine the K, alpha values for reference.