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Abstract
Determination of the values of K and alpha of the Mark-Houwink equation by applying the universal calibration curve and using a trial and error method was performed with samples of ethylene-propylene copolymers with broad MW distributions and different intrinsic viscosities. The following equation was obtained, correlating K with composition of ethylene-propylene copolymer and alpha: logK = log(5.755-4.65C3)-5.75 alpha where C3 is the mole percent of propylene in the copolymer, alpha is a value within the range of 0.73 and 0.755 (i.e., K and alpha are dependent upon each other). Values of intrinsic viscosity or molecular weight determined by means of the universal calibration curve agree well with those determined by solution viscosity, light scattering, and osmometry.