Two-dimensional chromatography of complex polymers, 5 Separation of blends of styrene-butadiene rubber and butyl rubber

Heinz, Lars-Christian; Siewing, Anja; Pasch, Harald

doi:10.1515/epoly.2003.3.1.839

Cited by 7 publications

(7 citation statements)

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“…Many polymers are not well soluble in water-containing mobile phases. NPLC PB-g-PMMA, 181 PS-co-PMA, 182 PC, 183 SBR and BR, 184 EPDM-g-PMMA, 185 functional PS 76,77 AEs 186 Low orthogonality…”

Section: Two-dimensional Separations Of Polymersmentioning

confidence: 99%

Challenges in polymer analysis by liquid chromatography

2012

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Section: Two-dimensional Separations Of Polymersmentioning

confidence: 99%

Challenges in polymer analysis by liquid chromatography

2012

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“…Thus, 2DLC separates polymers not only by size, but also by chemical type. These combinations have been successfully applied to the separation of poly(bisphenol A)carbonate (PC) [157,164], functional poly(Me methacrylate) (PMMA) [130], polyesters [165], blends of styrene-butadiene rubber and butadiene rubber [166], methyl methacrylategrafted polybutadiene [167], styrene-and methyl methacrylate-grafted epoxidized natural rubber [168] and methyl methacrylate-grafted EPDM [169]. SEC can also be used to separate proteins based on size differences thus SEC × RP has also been used for biopolymer separations [129].…”

Section: Overview Of Successful Combinations-mentioning

confidence: 99%

Fast, comprehensive two-dimensional liquid chromatography

Stoll

Xiao-ping

Wang

et al. 2007

Journal of Chromatography A

373

147

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The absolute need to improve the separating power of liquid chromatography, especially for multi-constituent biological samples, is becoming increasingly evident. In response, over the past few years, there has been a great deal of interest in the development of two-dimensional liquid chromatography (2DLC). Just as 1DLC is preferred to 1DGC based on its compatibility with biological materials we believe that ultimately 2DLC will be preferred to the much more highly developed 2DGC for such samples. The huge advantage of 2D chromatographic techniques over 1D methods is inherent in the tremendous potential increase in peak capacity (resolving power). This is especially true of comprehensive 2D chromatography wherein it is possible, under ideal conditions, to obtain a total peak capacity equal to the product of the peak capacities of the first and second dimension separations. However, the very long timescale (typically several hours to tens of hours) of comprehensive 2DLC is clearly its chief drawback. Recent advances in the use of higher temperatures to speed up isocratic and gradient elution liquid chromatography have been used to decrease the time needed to do the second dimension LC separation of 2DLC to about 20s for a full gradient elution run. Thus, fast, high temperature LC is becoming a very promising technique. Peak capacities of over 2000 and rates of peak capacity production of nearly 1 peak/s have been achieved. In consequence, many real samples showing more than 200 peaks with signal to noise ratios of better than 10:1 have been run in total times of under 30 min. This report is not intended to be a comprehensive review of 2DLC, but is deliberately focused on the issues involved in doing fast 2DLC by means of elevating the column temperature; however, many issues of broader applicability will be discussed.

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“…One very typical example for the useful application of two-dimensional liquid chromatography is the deformulation of graft copolymers. , Further interesting applications regarding the 2D-LC analysis of epoxy resins, , aliphatic polyesters, , polylactides , and polyamides have been published in the past decade. Significant work has been conducted on the analysis of segmented copolymers, including block and graft copolymers, hydrophilic copolymers, − and cosmetic copolymers …”

Section: Introductionmentioning

confidence: 99%

Online Coupling of Two-Dimensional Liquid Chromatography and NMR for the Analysis of Complex Polymers

et al. 2012

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For the first time, comprehensive two-dimensional liquid chromatography (2D-LC) of complex polymers is coupled online to 1H NMR. 2D-LC is used to separate mixtures of poly(ethylene oxide)s with regard to chemical composition and molar mass. The present samples contain polymers with different end groups and chain distributions. In the first LC dimension, liquid chromatography at critical conditions (LCCC) is used for the selective separation according to the end groups. Fractions that are then uniform regarding their end groups are automatically transferred into the second LC dimension which separates the fractions regarding their chain length distributions using liquid adsorption chromatography. The eluate from 2D-LC is directly introduced into the 1H NMR for on-flow analysis. The online coupling of one- and two-dimensional chromatography with 1H NMR detection is demonstrated. The NMR is coupled to both individual separations as well as to the entire two-dimensional separation. As a result of this multidimensional analysis quantitative information is obtained on the types and topology of end groups and the chain length distributions within each functionality fraction.

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Two-dimensional chromatography of complex polymers, 5 Separation of blends of styrene-butadiene rubber and butyl rubber

Cited by 7 publications

References 0 publications

Challenges in polymer analysis by liquid chromatography

Challenges in polymer analysis by liquid chromatography

Fast, comprehensive two-dimensional liquid chromatography

Online Coupling of Two-Dimensional Liquid Chromatography and NMR for the Analysis of Complex Polymers

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