Solvent‐Independent Molecular Weight Determination of Polymers Based on a Truly Universal Calibration

Diffusion‐ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences. Polystyrene and poly(ethylene glycol) standards have been used to calibrate DOSY diffusion data for a variety of solvents, showing a high correla...

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Veröffentlicht in:Angewandte Chemie International Edition Jg. 61; H. 5; S. e202114536 - n/a
Hauptverfasser: Voorter, Pieter‐Jan, McKay, Alasdair, Dai, Jinhuo, Paravagna, Olga, Cameron, Neil R., Junkers, Tanja
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Germany Wiley Subscription Services, Inc 26.01.2022
Ausgabe:International ed. in English
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ISSN:1433-7851, 1521-3773, 1521-3773
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Abstract Diffusion‐ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences. Polystyrene and poly(ethylene glycol) standards have been used to calibrate DOSY diffusion data for a variety of solvents, showing a high correlation of data when the bulk viscosity of the solvent is accounted for following the Stokes–Einstein equation. In this way, a type of universal calibration is introduced that allows for determinations of average molecular weight that are at least as accurate as those of traditional size‐exclusion chromatography (SEC), if not better. Further, we demonstrate that DOSY calibrations can be used between laboratories, hence removing the need for individual calibration of setups as currently done. A universal calibration curve for molecular weight determination is presented. Diffusion coefficients of poly(styrene) and poly(ethylene glycol) standards are measured via diffusion‐ordered NMR spectroscopy. These diffusion/molecular weight relationships are calibrated to be solvent‐independent. This universal calibration creates a novel platform wherein molecular weights of unknown polymers can be found using the universal calibration curve independent of what solvent is used.
AbstractList Diffusion‐ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences. Polystyrene and poly(ethylene glycol) standards have been used to calibrate DOSY diffusion data for a variety of solvents, showing a high correlation of data when the bulk viscosity of the solvent is accounted for following the Stokes–Einstein equation. In this way, a type of universal calibration is introduced that allows for determinations of average molecular weight that are at least as accurate as those of traditional size‐exclusion chromatography (SEC), if not better. Further, we demonstrate that DOSY calibrations can be used between laboratories, hence removing the need for individual calibration of setups as currently done.
Diffusion-ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences. Polystyrene and poly(ethylene glycol) standards have been used to calibrate DOSY diffusion data for a variety of solvents, showing a high correlation of data when the bulk viscosity of the solvent is accounted for following the Stokes-Einstein equation. In this way, a type of universal calibration is introduced that allows for determinations of average molecular weight that are at least as accurate as those of traditional size-exclusion chromatography (SEC), if not better. Further, we demonstrate that DOSY calibrations can be used between laboratories, hence removing the need for individual calibration of setups as currently done.Diffusion-ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences. Polystyrene and poly(ethylene glycol) standards have been used to calibrate DOSY diffusion data for a variety of solvents, showing a high correlation of data when the bulk viscosity of the solvent is accounted for following the Stokes-Einstein equation. In this way, a type of universal calibration is introduced that allows for determinations of average molecular weight that are at least as accurate as those of traditional size-exclusion chromatography (SEC), if not better. Further, we demonstrate that DOSY calibrations can be used between laboratories, hence removing the need for individual calibration of setups as currently done.
Diffusion‐ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences. Polystyrene and poly(ethylene glycol) standards have been used to calibrate DOSY diffusion data for a variety of solvents, showing a high correlation of data when the bulk viscosity of the solvent is accounted for following the Stokes–Einstein equation. In this way, a type of universal calibration is introduced that allows for determinations of average molecular weight that are at least as accurate as those of traditional size‐exclusion chromatography (SEC), if not better. Further, we demonstrate that DOSY calibrations can be used between laboratories, hence removing the need for individual calibration of setups as currently done. A universal calibration curve for molecular weight determination is presented. Diffusion coefficients of poly(styrene) and poly(ethylene glycol) standards are measured via diffusion‐ordered NMR spectroscopy. These diffusion/molecular weight relationships are calibrated to be solvent‐independent. This universal calibration creates a novel platform wherein molecular weights of unknown polymers can be found using the universal calibration curve independent of what solvent is used.
Author Junkers, Tanja
Dai, Jinhuo
Voorter, Pieter‐Jan
Cameron, Neil R.
McKay, Alasdair
Paravagna, Olga
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  surname: Junkers
  fullname: Junkers, Tanja
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Keywords Polymers
Diffusion ordered spectroscopy
Molecular weight determination
Universal calibration
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Snippet Diffusion‐ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences....
Diffusion-ordered NMR spectroscopy (DOSY) allows for accurate molecular weight calibration and determination that can be corrected for solvent influences....
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SubjectTerms Calibration
Diffusion ordered spectroscopy
Einstein equations
Magnetic resonance spectroscopy
Molecular weight
Molecular weight determination
NMR
NMR spectroscopy
Nuclear magnetic resonance
Polyethylene glycol
Polymers
Polystyrene
Polystyrene resins
Solvents
Universal calibration
Title Solvent‐Independent Molecular Weight Determination of Polymers Based on a Truly Universal Calibration
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fanie.202114536
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