A method has been developed to determine the distribution of the molecular weights of the high polymers.' The basis of this method is the separation of the fractions by lowering the temperature of a solution of the polymer containing a precipitant. Experiments have shown that the reproducibility of the method is good. By using a constant solvent/ precipitant ratio in different fractionations, it is possible, from the temperature of precipitation, to estimate approximately the limiting viscosity number of the fraction obtained. Z U SAMMENFAS S UN G:Es ist eine Methode zur Bestimmung der Verteilung der Molekulargewichte von hochpolymeren Stoffen entwickelt worden. Den Grund fur diese Methode bildet die Trennung der Fraktionen durch Erniedrigung der Temperatur einer Losung des Polymeren, die ein Fallungsmittel enthalt. Wie ausgefiihrte Versuche-gezeigt haben, ist die Reproduzierbarkeit der Methode gut. Durch Verwendung eines konstanten Verhaltnispes Losungsmittel/Fallungsmittel in verschiedenen Fraktionierungen, ist es moglich, die Grenzviskositatszahl der erhaltenen Fraktion aus der Fallungstemperatur annahernd zu schatzen.
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