We are analyzing https://link.springer.com/article/10.1007/s00216-010-4221-7.

Title:
Size-exclusion chromatography (SEC) of branched polymers and polysaccharides | Analytical and Bioanalytical Chemistry
Description:
Branched polymers are among the most important polymers, ranging from polyolefins to polysaccharides. Branching plays a key role in the chain dynamics. It is thus very important for application properties such as mechanical and adhesive properties and digestibility. It also plays a key role in viscous properties, and thus in the mechanism of the separation of these polymers in size-exclusion chromatography (SEC). Critically reviewing the literature, particularly on SEC of polyolefins, polyacrylates and starch, we discuss common pitfalls but also highlight some unexplored possibilities to characterize branched polymers. The presence of a few long-chain branches has been shown to lead to a poor separation in SEC, as evidenced by multiple-detection SEC or multidimensional liquid chromatography. The local dispersity can be large in that case, and the accuracy of molecular weight determination achieved by current methods is poor, although hydrodynamic volume distributions offer alternatives. In contrast, highly branched polymers do not suffer from this extensive incomplete separation in terms of molecular weight.
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Keywords {🔍}

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Topics {✒️}

dual/multi-angle light scattering molten poly[ethyleneco-alpha-olefin water-soluble sg1-based alkoxyamines high-performance size-exclusion chromatography field-flow fractionation techniques multiple-detection size-exclusion chromatography controlled/living free-radical polymerization multi-dimensional liquid chromatography field-flow fractionation field-flow fractionation [51 mark–houwink–sakurada coefficients size exclusion chromatography—homopolymers size-exclusion chromatography combined multidetector size-exclusion chromatography fluorophore-assisted carbohydrate electrophoresis article download pdf mark–houwink–sakurada parameters pulsed-laser radical polymerization size-exclusion chromatographic analysis weight-average molecular weight mark–houwink–sakurada plot mark–houwink–sakurada relation size-exclusion chromatographic assessment flow-injection polymer analysis wheat water-soluble arabinoxylans infrared/refractive index detection 13c melt-state nmr viscosity-average molecular weight chemie und pharmazie number-average molecular weight polystyrene-equivalent molecular weights divinylbenzene-linked polystyrene stars high-temperature sec system branched molecular-mass distributions weight-average intrinsic viscosity long-chain branch frequency number-average molecular weights 1h solution-state nmr diagnosing long-chain branching free-radical solution polymerization capillary electrophoresis—mass spectrometry molecular topology fractionation z-raft star polymerization pulsed-laser polymerization gel permeation chromatography gel-permeation chromatography electrospray mass spectrometry size-exclusion chromatography size exclusion chromatography size-exclusion chromatography

Questions {❓}

How does branching change SEC separation?

Schema {🗺️}

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         headline:Size-exclusion chromatography (SEC) of branched polymers and polysaccharides
         description:Branched polymers are among the most important polymers, ranging from polyolefins to polysaccharides. Branching plays a key role in the chain dynamics. It is thus very important for application properties such as mechanical and adhesive properties and digestibility. It also plays a key role in viscous properties, and thus in the mechanism of the separation of these polymers in size-exclusion chromatography (SEC). Critically reviewing the literature, particularly on SEC of polyolefins, polyacrylates and starch, we discuss common pitfalls but also highlight some unexplored possibilities to characterize branched polymers. The presence of a few long-chain branches has been shown to lead to a poor separation in SEC, as evidenced by multiple-detection SEC or multidimensional liquid chromatography. The local dispersity can be large in that case, and the accuracy of molecular weight determination achieved by current methods is poor, although hydrodynamic volume distributions offer alternatives. In contrast, highly branched polymers do not suffer from this extensive incomplete separation in terms of molecular weight.
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            Gel permeation chromatography
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            Characterization and Evaluation of Materials
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      headline:Size-exclusion chromatography (SEC) of branched polymers and polysaccharides
      description:Branched polymers are among the most important polymers, ranging from polyolefins to polysaccharides. Branching plays a key role in the chain dynamics. It is thus very important for application properties such as mechanical and adhesive properties and digestibility. It also plays a key role in viscous properties, and thus in the mechanism of the separation of these polymers in size-exclusion chromatography (SEC). Critically reviewing the literature, particularly on SEC of polyolefins, polyacrylates and starch, we discuss common pitfalls but also highlight some unexplored possibilities to characterize branched polymers. The presence of a few long-chain branches has been shown to lead to a poor separation in SEC, as evidenced by multiple-detection SEC or multidimensional liquid chromatography. The local dispersity can be large in that case, and the accuracy of molecular weight determination achieved by current methods is poor, although hydrodynamic volume distributions offer alternatives. In contrast, highly branched polymers do not suffer from this extensive incomplete separation in terms of molecular weight.
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         Gel permeation chromatography
         Branching
         Polyolefins
         Polyacrylates
         Starch
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         Characterization and Evaluation of Materials
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         Monitoring/Environmental Analysis
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