Phase distribution chromatography (PDC) as a method for the investigation of polymers in solution, 2. Flow‐equilibrium

Greschner, Georg S.

doi:10.1002/macp.1981.021821029

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…The temperature of operation is below the -temperature of the solute, and separation efficiency increases sharply with decreasing temperature. A fully automated chromatograph has been designed (247), and applications have been reported (248)(249)(250).…”

Section: Chromatography the Determination Of Molecular Weight Distributionmentioning

confidence: 99%

Molecular Weight Determination

Cooper

2004

Encyclopedia of Polymer Science and Technology

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Methods to determine molecular weight averages and distributions of polymeric and oligomeric materials have been devised and developed over many decades. Most of the early classical techniques were primary methods which usually yield only a single molecular weight average, based on theory and measurable constants. Of the classical methods only ultracentrifugation can determine a molecular weight distribution. Secondary methods, which depend on the availability of calibration materials, have largely supplanted the older classical techniques. Methods based on fractionation, with molecular weight characterization of the fractions, or chromatography, with continuous determination of molecular weight, are currently used to generate molecular weight distributions. Newer methods based on dynamic light scattering and viscoelastic measurements are available to determine the molecular weight distribution of difficulty soluble materials. Development of methods to describe the molecular weight and compositional distribution of multimer polymers continues to be a vibrant research area.

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Section: Chromatography the Determination Of Molecular Weight Distributionmentioning

confidence: 99%

Molecular Weight Determination

Cooper

2004

Encyclopedia of Polymer Science and Technology

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“…However, temperatures lower than this are used for better separation results, due to the solubility of UHPS and the low resolution near to this region 15. The theoretical background of PDC was extensively investigated and explained by Greschner 16–20 including the thermodynamics of molecular transport, the flow equilibrium and the deformation concept.…”

Section: Introductionmentioning

confidence: 99%

Separation of linear and star‐shaped polystyrenes by phase distribution chromatography

Boye

Scharfenberg

Lederer

2010

J of Separation Science

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The phase distribution chromatographic technique was optimized and applied for the separation of linear and star-shaped polystyrene (PS). For this purpose non-crosslinked, ultra high molecular weight PS coated on different supporting materials was used. The stability of the coating under chromatographic conditions was tested by thermo gravimetric analysis and microscopic techniques. The modification of different column packing materials was tested. Separation according to branching was indicated for different molecular weights of linear and star-shaped PS. The resolution of the separation was improved by changing the density of the stationary phase and the temperature. The separation results were supported by cloud point measurements and the determination of the critical conditions for linear and star-polymers at the same molecular weight.

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Phase distribution chromatography (PDC) as a method for the investigation of polymers in solution, 3. Determination of narrow molecular weight distributions

Greschner

1982

Makromol. Chem.

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Phase distribution chromatography (PDC) is demonstrated to be a powerful method for the correct determination of narrow molecular weight distributions. This is shown by comparing the molecular weight distributions (MWD) of polystyrenes obtained from PDC measurements with those obtained by Baker-Williams fractionation and by gel permeation chromatography. Four problems are formulated and analyzed which are closely connected with the calculation of the MWD from a measured PDC-elution curve at temperatures below the theta point of the system. Thus, the theory of PDC outlined previously is tested.

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Phase distribution chromatography (PDC) as a method for the investigation of polymers in solution, 2. Flow‐equilibrium

Cited by 7 publications

References 9 publications

Molecular Weight Determination

Molecular Weight Determination

Separation of linear and star‐shaped polystyrenes by phase distribution chromatography

Phase distribution chromatography (PDC) as a method for the investigation of polymers in solution, 3. Determination of narrow molecular weight distributions

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