Reconcentration of diluted polymer solutions by full adsorption/desorption procedure: II. Desorption of macromolecules by a narrow pulse of displacer

Nguyen, Son Hoai; Berek, Dušan

doi:10.1002/(sici)1099-0518(19990201)37:3<267::aid-pola3>3.0.co;2-w

Cited by 14 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A review on the recent progress in combining a full adsorption/desorption procedure with SEC (FAD/SEC) to the separation and characterization of co-polymers has been published by Nguyen and Berek [287]. FAD includes complete and selective adsorption of the polymer sample to be separated from a solvent promoting adsorption onto an appropriate adsorbent, which is packed into a designed LC-type microcolumn.…”

Section: Polymersmentioning

confidence: 99%

Chapter 5 Size-exclusion chromatography

Silberring¹,

Kowalczuk²,

Bergquist³

et al. 2004

Journal of Chromatography Library

View full text Add to dashboard Cite

Section: Polymersmentioning

confidence: 99%

Chapter 5 Size-exclusion chromatography

Silberring¹,

Kowalczuk²,

Bergquist³

et al. 2004

Journal of Chromatography Library

View full text Add to dashboard Cite

“…The reconcentration of diluted polymer solutions based on full ad-sorption=desorption (FAD) of polymers within an appropriate adsorbent has been proposed and tested [7,8] . As the name implies, this original pro-54…”

Section: Reconcentration Of Highly Diluted Polymer Solutionsmentioning

confidence: 99%

“…The concentration profiles of desorbing liquid pulse can be monitored, for example, with a density detector [8] . It is necessary to elucidate the dynamics of attachment and detachment processes, the role of adsorli-desorli microgradients formed during eluent switching and the desorli pulse progression, as well as the effects of macroscopic parameters of the systems.…”

mentioning

confidence: 99%

Separation and Characterization of Polymers Applying Full Adsorption/Desorption Approaches

Nguyen

Berek

2002

International Journal of Polymer Analysis and Characterization

View full text Add to dashboard Cite

The present contribution is a review of the recent progress in combining a full adsorption=desorption procedure with size exclusion chromatography (FAD=SEC) for the separation and characterization of (co)polymers. FAD includes complete and selective adsorption of the polymer sample to be separated from an adsorption promoting-liquid (adsorli) onto an appropriate adsorbent, which is packed in an especially designed LC-like (micro)column. In the following steps, macromolecules are successively displaced from the adsorbent by different eluents with increasing desorbing strength. Adsorption and desorption of macromolecules are generally governed by their molecular characteristics, primarily by their molar mass (MM) and their chemical nature, that is, by their chemical composition (CC). Therefore, fractionation of polymers according to these parameters can be reached in the course of the FAD process. In this respect, a coupling of an SEC instrument with the FAD column has turned out to be very advantageous. The on-line SEC enables monitoring the amount, molar mass and molar mass distribution of macromolecules leaving the FAD column. In this way, constituents of polymer blends can be discriminated and independently characterized.Advantages and problems associated with the applications of FAD approaches are outlined. The assessment of dynamic adsorption=desorption of macromolecules onto=from solid surfaces as part of the optimization procedure is discussed as well.Polymer science and technology is required to meet product and market needs. The effectiveness of R & D should be carried out with a strong regard to product quality, as well as to safety, health and environmental values like waste reduction and energy conservation. Recently, we have witnessed rapid development of high-performance polymeric materials, e.g., polymer blends, copolymers, sequenced and functionalized polymers, i.e., complex polymer systems. Complex polymers exhibit multiple distributions, namely molar mass distribution, chemical composition distribution, distribution of functionalities, distribution of sequence lengths and possibly also physical, structural and topological distributions. These distributions are well known to affect both the processing ability and the end-use properties of polymeric materials. Therefore, the establishment of relationships between structure, processing and properties is of great importance for the development of novel polymeric materials. As a result, measurement of average properties is often inadequate to fully characterize and elucidate the nature of such materials. In other words, methods that do not involve any separation, such as osmometry, light scattering, viscometry, NMR or FT-IR and classical methods for end-group determination, can yield only average values, e.g., molar mass, chemical composition and functionality, but not their distribution(s). A combination of separation and characterization techniques or multidimensional approaches represents one of the options to fulfill the complicated task of analys...

show abstract

Molecular characterization of statistical copolymers: 1. Potential and limitations of full adsorption-desorption procedure in separation of statistical copolymers

Berek

Nguyen

Pavlineč

2000

J. Appl. Polym. Sci.

Self Cite

View full text Add to dashboard Cite

Dynamic integral desorption isotherms for a series of poly(methyl methacrylate) homopolymers and poly(methyl methacrylate)-polystyrene statistical copolymers were measured. Nonporous silica was the full adsorption-desorption (FAD) column packing and various adsorption-promoting and desorption-promoting liquids were used. The aim of this study was to evaluate the applicability of the FAD approach for separation of statistical copolymers. The effects of the adsorbing liquid and desorbing liquid nature were demonstrated on the positions and shapes of desorption isotherms. The desorption isotherms also strongly depended on both (co)polymer molar mass and copolymer chemical composition. This indicates large fractionation potential of the FAD procedure. Simultaneously, the interference of both above parameters prevents the direct use of FAD for fractionation of the copolymers. It is anticipated that the fractionation and/or reconcentration potential of the FAD procedure can be very effectively utilized in combination of FAD with size-exclusion chromatography and/or with gradient elution liquid adsorption chromatography.

show abstract

Reconcentration of diluted polymer solutions by full adsorption/desorption procedure: II. Desorption of macromolecules by a narrow pulse of displacer

Cited by 14 publications

References 5 publications

Chapter 5 Size-exclusion chromatography

Chapter 5 Size-exclusion chromatography

Separation and Characterization of Polymers Applying Full Adsorption/Desorption Approaches

Molecular characterization of statistical copolymers: 1. Potential and limitations of full adsorption-desorption procedure in separation of statistical copolymers

Contact Info

Product

Resources

About