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介绍了采用不同特性粘数和分子量分布的聚合物为标样,应用普适标定曲线,以试误法订定Mark-Houwink参数K和α最佳值的方法。分别订定了聚苯乙烯、乙丙共聚物、聚丙烯和聚氯乙烯等的K和α值(邻二氯苯,135℃或90℃)。特性粘数的相对误差分别在6％或4％以下;聚苯乙烯的粘均分子量与Pressure Chemical Co.提供的数据符合得较好;乙丙共聚物的重均和数均分子量也分别与用小角激光光散射仪和膜渗透计测定的结果一致。同时,在实验误差范围内,对于所有聚合物发现logK与α成线性关系。
This paper introduced the use of polymer with different intrinsic viscosity and molecular weight distribution as the standard sample, and applied universal calibration curves to determine the best Mark-Houwink parameters K and α by trial and error method. K and α values (ortho-dichlorobenzene, 135 ° C or 90 ° C) of polystyrene, ethylene-propylene copolymer, polypropylene and polyvinyl chloride, respectively, are set. The relative error of intrinsic viscosity was below 6% or 4%, respectively. The viscosity average molecular weight of polystyrene was in good agreement with the data provided by Pressure Chemical Co.. The weight average molecular weight and number average molecular weight of ethylene-propylene copolymer were respectively Small-angle laser light scattering instrument and membrane osmometer determination of the results. At the same time, log K is linearly related to α for all polymers within experimental error.