Flüssigchromatographie von Makromolekülen unter kritischen Bedingungen. Zur Auftrennung von Poly(oxypropylenpolyolen) nach ihrer Funktionalität

Gorškov, A. V.; Jevreinov, V. V.; Lausecker, Berthold; Pasch, Harald; Becker, Hans; Wagner, G

doi:10.1002/actp.1986.010371118

Cited by 18 publications

(4 citation statements)

References 4 publications

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“…Experimental work in the critical point is not easy, but possible. − ,− It is thus also possible to verify the above conclusions, for which the experiments are planned in the group of Trathnigg. ,,, …”

Section: Procedures For Determining the Pore Diameter And The Interac...mentioning

confidence: 96%

End-Functionalized Polymer as a Tool to Determine the Pore Size and the Interaction Parameters in Liquid Chromatography

Skvortsov

Fleer

2002

Macromolecules

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We present a general relation between the polymer excess in depletion (or adsorption) layers near a solid surface and the partition coefficient for distributing the polymer over a system of wide pores and a bulk solution. Using this relation, an analytical theory of liquid chromatography of polymers with and without specific end groups is constructed. This theory can be applied to size exclusion chromatography (SEC), critical chromatography (CC), and adsorption chromatography (AC). The dependence of the retention volume of non-, mono-, and difunctional polymers on molar mass, pore width, and two polymersurface interaction parameters is analyzed. One such interaction parameter applies to the main-chain units of the polymer, the other to the end groups. Several procedures to obtain these interaction parameters from experimental data are described. It is shown that experiments with well-defined nonfunctional, monofunctional, and difunctional polymers enable the determination of the surface area of porous and nonporous materials.

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Section: Procedures For Determining the Pore Diameter And The Interac...mentioning

confidence: 96%

End-Functionalized Polymer as a Tool to Determine the Pore Size and the Interaction Parameters in Liquid Chromatography

Skvortsov

Fleer

2002

Macromolecules

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“…In principle, a separation of polymers according to functionality can be achieved by LC at critical conditions (LCCC) 8, 12–15.…”

Section: Introductionmentioning

confidence: 99%

Characterization of PEG in monomethyl ethers of PEG by 2‐D LC

Ahmed

Trathnigg

2010

J of Separation Science

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PEGs present in samples of the corresponding monomethyl ethers are analyzed by 2-D LC with LC at critical conditions as the first and liquid adsorption chromatography as the second dimension. The fractions from the first dimension are transferred to the second one by heart-cutting using a ten-port valve. The efficiency of the separation is dramatically improved by adding water to the eluate from the first dimension before the switching valve in order to have a weaker eluent in the fraction than that of the second dimension. By this procedure, the fractions are focussed and reconcentrated. The molar mass distribution of the PEG fraction can be determined with good accuracy even at very low amounts of PEG in the PEG-monomethyl ethers (down to 0.5%).

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“…A conventional two‐dimensional (2D) analysis of polymer can be typically performed by coupling liquid adsorption chromatography at ‘critical’ conditions (LACCC) and size‐exclusion chromatography (SEC). The principle of this coupling method, also known as orthogonal chromatography, has been extensively described,1–9 and will be only briefly mentioned here.…”

mentioning

confidence: 99%

A novel software tool for copolymer characterization by coupling of liquid chromatography with matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry

Weidner¹,

Falkenhagen²,

Sauerland³

et al. 2007

Rapid Comm Mass Spectrometry

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The results of copolymer characterization by coupling of chromatography and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) techniques and subsequent calculation of copolymer composition using a novel software tool 'MassChrom2D' are presented. For high-resolution mass analysis copolymer samples were fractionated by means of liquid adsorption chromatography (LAC). These fractions were investigated off-line by MALDI-TOF MS. Various mono-n-butyl ethers of polyethylene oxide-polypropylene oxide copolymers (PEO-co-PPO) were investigated. As well as the copolymer composition presented in two-dimensional plots, the applied approach can give additional hints on specific structure-dependent separation conditions in chromatography.

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Flüssigchromatographie von Makromolekülen unter kritischen Bedingungen. Zur Auftrennung von Poly(oxypropylenpolyolen) nach ihrer Funktionalität

Cited by 18 publications

References 4 publications

End-Functionalized Polymer as a Tool to Determine the Pore Size and the Interaction Parameters in Liquid Chromatography

End-Functionalized Polymer as a Tool to Determine the Pore Size and the Interaction Parameters in Liquid Chromatography

Characterization of PEG in monomethyl ethers of PEG by 2‐D LC

A novel software tool for copolymer characterization by coupling of liquid chromatography with matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry

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