Abstract: For the lincar calibration of the monodisperse polymer species using more than two polydisperse standards with known number-average MW, an effective and fast one-variableapproach is deseribed. The equation ln M = A-BV containing only one variable B can besolved by the Newton's iteractive method, and the value of A is determined. The SEC(size exclusion chromatography) data of the characterized polyurethane samples were cor-rected for the chromatographic spreading and then used to demonstrate this computationalprocedure. The deviations of the number-average MW caculated by SEC from the resultsby osmotic msthed are acceptable.

Key words: Size exclusion chromatography, Calibration, Polydisperse polymer standards, Number-average MW