The efficiency of precipitational fractionation

Kamide, Kenji; Nakayama, Chozo

doi:10.1002/macp.1969.021290123

Cited by 21 publications

(3 citation statements)

References 11 publications

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“…In addition to the above-mentioned 1 : 1 mixture, unequal weight mixtures were dissolved in a solvent (initial concentration VP 0 = 1 X 10- 4 here is the upper limit of vP 0 :…”

Section: Experiments 2: Fractionation Experimentsmentioning

confidence: 99%

Resolving Power and Separation Yield of the Molecular Weight Fractionation Method Based on Solubility Difference: A Computer Simulation Survey

Kamide

Miyazaki

1980

Polym J

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New parameters such as the resolving power RP and various separation yield Yare defined to adequately represent fractionation efficiency in molecular weight fractionation by solubility difference. The effect of fractionation conditions (the initial polymer volume fraction vP 0 ' the total fraction number n, and the concentration dependence parameter p of the polymer-solvent interaction parameter x) on the above efficiency parameters is clarified on binary mixtures consisting of two different polymer-to-solvent molar volume ratio X1 and X 2 by using computer experiments, which are equivalent to 2089 single-phase separation experiments. A very high resolving power cannot be expected for a single step of the phase separation. The fractionation, combined with low vv 0 and high n" affords a high separation yield, except for the high molecular weight component fraction separated by successive precipitation fractionation (SPF), whose Y is always zero. In contrast to this, successive solutional fractionation (SSF) enables us to isolate the high molecular weight component much more effectively than the low component.

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“…In addition to the above-mentioned 1 : 1 mixture, unequal weight mixtures were dissolved in a solvent (initial concentration VP 0 = 1 X 10- 4 here is the upper limit of vP 0 :…”

Section: Experiments 2: Fractionation Experimentsmentioning

confidence: 99%

Resolving Power and Separation Yield of the Molecular Weight Fractionation Method Based on Solubility Difference: A Computer Simulation Survey

Kamide

Miyazaki

1980

Polym J

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“…Huggins [86J discussed the role of solvent-polymer interaction in the efficiency of polymer fractionation. Kamide and Nakayama [87] used fractions computed from a digital computer to discuss the efficiency of polymer fractionation. It appears, however, that the optimization of fractionation efficiency as recommended by the above workers can easily be offset by limitations in practices.…”

Section: Batch Fractionationmentioning

confidence: 99%

Recent Advances in Polymer Fractionation

Tung

1971

Journal of Macromolecular Science, Part C: Polymer Reviews

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“…lo4, die obere MeIjgrenze, die durch besondere Konstruktion bis an = 5 . l o 4 [2], an = l o 5 [18] ZTtr(t) = ZTr(t = 0) ekt, (12) k = /(AT).…”

Section: Introductionunclassified

Dampfdruckosmometrie. Einfluß der Verdünnung des Lösungstropfens auf das Messen der Molekülmasse und des 2. Virialkoeffizienten

Arndt

1979

Acta Polymerica

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Die Verduunung des Losungstroplens mil der Zeit wird messend verfolgt und ihr EinfluIj auf die Genauigkeit der Molmassenbestimmungdiskutiert. Diffusionskoeffizienten konneri aus der hlassenzunahme des Losungstropfens berechnet werden. Die fnderung der Losurigskonzentration mit der Zeit gibt die hfoglichkeit,, nur mit einer Ausgangskonzentration Eichkonstante und Molmasse zu ermitteln. 2. Virialkoeffizienten von PolS-stSrolstandards (B, = 0,6 . 103 bis 3,G . lo5), mittels Dampfdruckosmometrie gemessen, werden angegeben.( N , = 0,6 . 103 -3,6 . 105). Vapour pressure osmometry. Effect of solution drop dilution o n the determination o f the molecular weight and second virial coefficientThe time-dependence of solution drop dilution was determined and its eIfect on the precision of molecular weight determination is discussed. The dilfusion coefficients can be calculated by the weight increase of the drop. The time-dependence of the concentrat,ion of the solution allows the determination of the calibration constant and molecular weight by only one value of initial concentration. Tlic values of the second virial coefficient of polystyrerie standard samples (a, = 0.6 x l o 3 t o 3.6 x lo5) as measured by vapour pressure osmonietry are indicated.

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The efficiency of precipitational fractionation

Abstract: When a polymer solution is separated into two liquid phases by changing the temperature, the fraction fx(2) of a given X-mer remaining in the polymer-rich phase is expressed, according to the theories of FLORY and HUGGINS, as

Cited by 21 publications

References 11 publications

Resolving Power and Separation Yield of the Molecular Weight Fractionation Method Based on Solubility Difference: A Computer Simulation Survey

Resolving Power and Separation Yield of the Molecular Weight Fractionation Method Based on Solubility Difference: A Computer Simulation Survey

Recent Advances in Polymer Fractionation

Dampfdruckosmometrie. Einfluß der Verdünnung des Lösungstropfens auf das Messen der Molekülmasse und des 2. Virialkoeffizienten

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