Chemical composition separation of synthetic polymers by reversed-phase liquid chromatography

Schunk, T. C.

doi:10.1016/0021-9673(93)80821-o

Cited by 44 publications

(17 citation statements)

References 52 publications

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“…Curvature in the very low p range has been observed earlier and can be ascribed to the effect of the (butyl) end group on the total free energy of transfer of the first oligomers [32]. Deviations from linearity in the higher p range for other types of oligomers and homologues have been shown to occur at the critical carbon number and have been ascribed to a change in sorption mechanism from 'dissolution' in the bonded layer to physical adsorption [19,41].…”

Section: Hplc Equipment 33 Determination Of Phase Ratio and Ksec Vamentioning

confidence: 69%

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Study on the retention behaviour of low-molar-mass polystyrenes and polyesters in reversed-phase liquid chromatography by evaluation of thermodynamic parameters

Philipsen¹,

Claessens

Lind³

et al. 1997

Journal of Chromatography A

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. (1997). Study on the retention behaviour of low-molar-mass polystyrenes and polyesters in reversed-phase liquid chromatography by evaluation of thermodynamic parameters. Journal of Chromatography, A, 790(1-2), 101-116. DOI: 10.1016/S0021-9673(97)00739-5 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractPolymers can be characterized under sorption conditions, to obtain information on molar mass and chemical composition. In order to get a better understanding of their retention behaviour under such conditions, the evaluation of thermodynamic parameters obtained from van't Hoff analyses on low-molar-mass polystyrenes (PS) and polyesters (PE) in various THF-water mixtures on a C column is described in this study. Linear van't Hoff behaviour was observed in almost all 18 cases. Negative values for both DH and DS were found for both PS and PE oligomers, which increase with increasing %THF. For DS this is explained from multi-site attachment effects. For PS, the non-linear relations between DH and DS, and degree of polymerization ( p) could be properly described by the Stockmayer-Fixman equation. Although less clear, similar trends were found for PE. For PS, evidence for penetration effects of oligomer chains into the bonded chains was obtained. Martin plots for both PS and PE were shown to be non-linear in all investigated eluent compositions. The extent of non-linearity is suggested to depend on the conformation of a polymer in solution. No distinct enthalpy-entropycompensation temperature (EECT) independent of p was found for PS, thus confirming the findings of an earlier study in which no exact molar mass independence was found under critical conditions. Further evaluation of EECT for PS oligomers revealed a retention mechanism independent of the binary eluent composition. This indicates that conclusions from this study can also be used for a qualitative understanding of sorption mechanisms in the gradient elution mode. Finally, for PS it was shown that DG equals zero under critical conditions, thus confirming theoretical predictions. © 1997 Elsevier Science B. V.

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Section: Hplc Equipment 33 Determination Of Phase Ratio and Ksec Vamentioning

confidence: 69%

“…From the observed trends of DH /TDS versus p, it mainly based on adsorption rather than partitioning could be concluded that these differences are highly [32]. Furthermore it is known that different sites of significant.…”

Section: Hplc Equipment 33 Determination Of Phase Ratio and Ksec Vamentioning

confidence: 93%

Study on the retention behaviour of low-molar-mass polystyrenes and polyesters in reversed-phase liquid chromatography by evaluation of thermodynamic parameters

Philipsen¹,

Claessens

Lind³

et al. 1997

Journal of Chromatography A

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“…Reversed-phase liquid chromatographic techniques have been used for the characterization of both copolymers and resins [11]. In the first part of this series of papers, we clearly demonstrated the applicability of GPEC under reversed-phase conditions for the characterization of (co)polyester resins according to differences in chemical microstructure [8].…”

Section: Introductionmentioning

confidence: 77%

Characterization of low-molar-mass polymers by gradient polymer elution chromatography II. Solubility effects in the analysis of polyester resins under reversed-phase conditions

Philipsen¹,

Cooker

Claessens

et al. 1997

Journal of Chromatography A

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“…Thus, there is a need for separation techniques resolving polymers according to chemical composition. The use of interaction based liquid chromatography (LC) for the separation of synthetic polymers according to chemical composition has increased lately, and this approach has proven to be a promising alternative to SEC for the separation of polymers and determination of molecular weight distributions in polydisperse polymers [2].…”

Section: Introductionmentioning

confidence: 99%

Temperature-programmed packed-capillary liquid chromatographic separation of polystyrenes

Bruheim

Molander

et al. 2001

Chromatographia

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SummaryTemperature-programmed packed capillary liquid chromatography with UV detection has been used for the separation of a wide range of polysf,/renes. The low thermal mass of the reversed phase packed capillary columns (0.32-mm internal diameter) allowed rapid temperature programming for retention control. By the use of temperature gradients as steep as 40~ 9 min 1, rapid separations (11 minutes) of polysf,/rene standards (2000-400000) could be achieved. Furthermore, the oligomers of the polyslyrene 1000 standard were resolved using temperature programming. When replacing tetrahydrofurane with acetonitrile as mobile phase component, peak splitting within the ohgomer peaks was observed, revealing some information about the tacticify of the polysf,/rene 1000 sample.

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Chemical composition separation of synthetic polymers by reversed-phase liquid chromatography

Cited by 44 publications

References 52 publications

Study on the retention behaviour of low-molar-mass polystyrenes and polyesters in reversed-phase liquid chromatography by evaluation of thermodynamic parameters

Study on the retention behaviour of low-molar-mass polystyrenes and polyesters in reversed-phase liquid chromatography by evaluation of thermodynamic parameters

Characterization of low-molar-mass polymers by gradient polymer elution chromatography II. Solubility effects in the analysis of polyester resins under reversed-phase conditions

Temperature-programmed packed-capillary liquid chromatographic separation of polystyrenes

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