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- W4247369567 abstract "The solutional fractionations were carried out experimentally on lowering the temperature of solutions of atactic polystyrene in methylcyclohexane. The concentration of the initial solution and the relative amount of the polymer dissolving in the polymer-lean phase (i.e., the amount of the fraction) were systematically changed. Gel permeation chromatography was applied to determine the molecular weight distribution (MWD) of the first fractions and the original polymer. In addition, polydispersity parameters including the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, and the standard deviation, σ′, were calculated from MWD curves. Effects of the fractional conditions on the MWD for the first fractions were compared with those obtained by the computer simulation as well as the experimental results obtained in the case of the precipitational fractionation. The validity of the theoretical conclusions on the solutional fractionation, reached from the computer simulations, was definitely confirmed from the experiments. An Lösungen von ataktischem Polystyrol in Methylcyclohexan wurde mittels Temperaturerniedrigung eine Lösungsfraktionierung ausgeführt. Die Konzentration der Ausgangslösung und der Anteil des Polymeren in der Solphase (d. h. die Menge der Fraktion) wurden systematisch variiert. Für die ersten Fraktionen und das Ausgangspolymere wurden die Molekulargewichtsverteilungen mittels Gelpermeationschromatographie bestimmt. Aus den Molekulargewichtsverteilungen wurden zusätzlich Parameter der Polymolekularität einschließlich des Verhältnisses von Gewichts- zu Zahlenmittelmolekulargewicht Mw/Mn und der Standardabweichung σ′ berechnet. Der Einfluß der experimentellen Fraktionierbedingungen wurde mit denen bei Computersimulation und bei experimenteller Fällungsfraktionierung verglichen. Die Gültigkeit der theoretischen Schlüsse zur Lösungsfraktionierung aus der Computersimulation wurde durch die Experimente eindeutig bestätigt." @default.
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- W4247369567 date "1972-06-26" @default.
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- W4247369567 doi "https://doi.org/10.1002/macp.1972.021560121" @default.
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