Theory of chromatographic separation of linear and star-shaped binary block-copolymers

Горбунов, А.А.; Vakhrushev, Andrey V.

doi:10.1016/j.chroma.2004.12.051

Cited by 43 publications

(32 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on this theory, one may predict the chromatographic behaviour of polymers [7] and even simulate chromatograms of complex polymers [12][13][14][15], provided that these parameters are known with sufficient accuracy.…”

Section: The Interaction Parameter In Lcmentioning

confidence: 99%

Adsorption interaction parameter of polyethers in ternary mobile phases: The critical adsorption line

Cuong

Trathnigg

2010

J of Separation Science

View full text Add to dashboard Cite

It is shown that in LC of polymers, the interaction parameter in ternary mobile phases can be described by a plane, which is determined by the dependencies in binary mobile phases. Instead of a critical adsorption point, critical conditions are observed along a straight line of composition between the two critical points in binary mobile phases. Consequently, a separation of block copolymers under critical conditions for one block by an adsorption mechanism for the other block can be achieved in ternary mobile phases of different compositions, which allows an adjustment of the retention of the adsorbing block.

show abstract

Section: The Interaction Parameter In Lcmentioning

confidence: 99%

Adsorption interaction parameter of polyethers in ternary mobile phases: The critical adsorption line

Cuong

Trathnigg

2010

J of Separation Science

View full text Add to dashboard Cite

show abstract

“…Several groups reported either experimental or simulation results, but the influence of each parameter is not yet clearly understood and even still debated. [35,[43][44][45][46] Within our study, the ''invisible'' block, polyMA, has no evident influence on the elution behavior of the block copolymer, neither from its molecular weight effect nor from its architecture effect. Thus, the critical conditions for polyMA homopolymers were used for analysis of polyMA-polySt linear and 3-arm star block copolymer with polyMA-Br as MI.…”

Section: As MImentioning

confidence: 99%

Characterization of Linear and 3‐Arm Star Block Copolymers by Liquid Chromatography at Critical Conditions

Gao

Min

Matyjaszewski

2006

Macro Chemistry & Physics

View full text Add to dashboard Cite

Summary: LCCC for polyMA homopolymers was established in order to analyze the polyMA‐polySt linear and star block copolymers. The validity of the assumption that under the LCCC for polyMA, the polyMA segment in the polyMA‐containing block copolymer is chromatographically “invisible” was verified. It was found that within the scale of investigation ($\overline M _{{\rm n},{\rm polyMA}} \leq 5\;\overline M _{{\rm n},{\rm polySt}}$), the molecular weight and architecture of the polyMA segments had no evident influence on the retention behavior of the polySt‐polyMA block copolymers and the polyMA block in the copolymer was “invisible”. The critical conditions of polyMA were used for quantitative analysis of the polySt block in the linear and 3‐arm star polyMA‐polySt block copolymers, which were synthesized by AGET ATRP in miniemulsion. It was shown that the copolymer had completely different elution peak from its MI. The calculated molecular weights of polySt blocks in the block copolymers were similar to those obtained from normal SEC analysis. Transferring the eluates from the LCCC (the first dimension) column to a SEC column (the second dimension) produced LCCC × SEC two‐dimensional chromatogram, which contained information on both chemical composition and molecular weight of the synthesized copolymers. The combination of these liquid chromatography methods clearly confirmed the high initiation efficiency of the polyMA MIs during the synthesis of block copolymers and the presence of a byproduct formed by radical‐radical coupling. magnified image

show abstract

“…al. [36], and by Gorbunov and Vakhrushev [37,38]. The theories are also available now for several types of complex macrocyclic structures, such as eightshaped and daisy-like macromolecules [39], and theta-shaped polymers [40].…”

Section: Introductionmentioning

confidence: 96%

Simulating chromatographic separation of topologically different polymers

Горбунов

Vakhrushev

2010

Procedia Chemistry

Self Cite

View full text Add to dashboard Cite

Chromatography which is sensitive to the sizes of macromolecules and to their adsorption serves as an appropriate method to separate complex polymers. Unfortunately, the molar mass also influences the chromatographic retention, thus making quite difficult the problem of separation of polydisperse polymers by their topology. By using a theory of chromatographic behavior of macromolecules, we simulate chromatograms of polydisperse polymers that differ solely in their topology, and discuss possibilities to separate complex polymers (such as eight-, tadpole-, theta-, manacleshaped polymers, etc.) from their linear, branched, or macrocyclic precursors or topo-isomeric products. As follows from the simulations, two approaches towards the separation of polydisperse polymers by topology are especially promising. The first one is the chromatography at optimized (critical or near-critical) interaction conditions, where molar-mass effects are minimized; The second one consists in combing different chromatographic modes, which allows obtaining a separation by both molar mass and topology in a 2D chromatogram. Some of the simulated chromatographic separations are qualitatively very similar to the real ones, the others are the theoretical prediction.

show abstract

Theory of chromatographic separation of linear and star-shaped binary block-copolymers

Cited by 43 publications

References 48 publications

Adsorption interaction parameter of polyethers in ternary mobile phases: The critical adsorption line

Adsorption interaction parameter of polyethers in ternary mobile phases: The critical adsorption line

Characterization of Linear and 3‐Arm Star Block Copolymers by Liquid Chromatography at Critical Conditions

Simulating chromatographic separation of topologically different polymers

Contact Info

Product

Resources

About