Determination of molecular-weight distribution of polymers by microcolumn exclusion chromatography

Kever, J. J.; Belen'kii, B.G.; Gankina, E.S.; Vilenchik, L.Z.; Kurenbin, O.I.; Zhmakina, T.P.

doi:10.1016/s0021-9673(00)82701-6

Cited by 16 publications

(4 citation statements)

References 2 publications

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“…10 Ishii and Takeuchi 11,12 illustrated that the high permeability of microscale columns made highly efficient separations (100 000 plates) possible by SEC. Others have illustrated useful applications of microscale SEC [13][14][15] and discussed optimum instrumentation for the technique. 16 Due to the small volumes involved in microscale separations, the extracolumn contribution to band broadening must be carefully controlled.…”

Section: Microscale Chromatography Has Found Numerous Applications In...mentioning

confidence: 99%

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Improvements in Polymer Characterization by Size-Exclusion Chromatography and Liquid Chromatography at the Critical Condition by Using Enhanced-Fluidity Liquid Mobile Phases with Packed Capillary Columns

1998

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Microscale chromatography has found numerous applications in liquid chromatography. The combination of enhanced-fluidity liquid mobile phases with packed-capillary LC is evaluated for polymer characterization using size-exclusion chromatography (SEC) and liquid chromatography at the critical condition (LCCC) phase. Separations of polystyrene polymers and copolymers are completed using liquid chromatography at the critical condition. The critical conditions of polystyrene polymers were approached by changing the concentration of CO(2) in the mixture combined with temperature and pressure variation. Because the solvent strength of enhanced-fluidity liquid mixtures is affected by temperature and pressure variation, the solvent strength could be fine-tuned to accurately find the critical condition. Long packed capillaries could be used in this application because the enhanced-fluidity mobile phases have low viscosities. High efficiencies resulted. The performance of packed-capillary and analytical-scale analytical columns containing the same packing material was compared for a challenging separation at the critical condition.

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Section: Microscale Chromatography Has Found Numerous Applications In...mentioning

confidence: 99%

“…Ishii and Takeuchi , illustrated that the high permeability of microscale columns made highly efficient separations (100 000 plates) possible by SEC. Others have illustrated useful applications of microscale SEC − and discussed optimum instrumentation for the technique …”

mentioning

confidence: 99%

Improvements in Polymer Characterization by Size-Exclusion Chromatography and Liquid Chromatography at the Critical Condition by Using Enhanced-Fluidity Liquid Mobile Phases with Packed Capillary Columns

1998

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“…In this case the pressure in the pump chamber increases from P, = QK (6) to P' = QK' (7) for the time…”

Section: Optimization Of the Eluent Delivery System For Msecmentioning

confidence: 99%

Optimization of the eluent delivery system for micro size‐exclusion chromatography

Alexandrov

Belen'kii

Gotlib

et al. 1992

J Microcolumn Separations

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Abstract. The problems of microcolumn size-exclusion chromatography and its instrumentation are considered. It is shown that the reproducibility of retention times of a micro-gel chromatograph depends on the stability of eluent delivery by a syringe micropump. It is possible to increase this stability and to suppress the relaxation processes related to the changes in hydrodynamic column resistance and in the solvent temperature in the pump chamber.In order to suppress instability when columns of 0.5-mm inner diameters are used, the volume of the eluent delivery system should be as small as possible (Vp < 1 mL) and the system should be thermostatted at AT (P,(a/fl)6 where P, is the pressure under conditions of constant pump pressure, a and fl are the coefficients of thermal expansion and compressibility of the liquid, and 6 is the permissible retention time error (At&).

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“…They compare the column's performance with that of a commercial high-performance SEC column and evaluate the effects of column temperature and of varying the column inner diameter on the resolution. Kever et al (16B,17B,18B) develop high-resolution microcolumns (0.6 X 300 mm) with a mixed silica bed. Heitz (9B) obtains high resolution in the SEC analysis of oligomers using a coiled column of poly(tetrafluoroethylene) tubing and a "soft" poly(vinyl acetate) gel packing.…”

Section: Columns and Column Packing Materialsmentioning

confidence: 99%

Size exclusion chromatography

Hagnauer¹

1982

Anal. Chem.

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Determination of molecular-weight distribution of polymers by microcolumn exclusion chromatography

Cited by 16 publications

References 2 publications

Improvements in Polymer Characterization by Size-Exclusion Chromatography and Liquid Chromatography at the Critical Condition by Using Enhanced-Fluidity Liquid Mobile Phases with Packed Capillary Columns

Improvements in Polymer Characterization by Size-Exclusion Chromatography and Liquid Chromatography at the Critical Condition by Using Enhanced-Fluidity Liquid Mobile Phases with Packed Capillary Columns

Optimization of the eluent delivery system for micro size‐exclusion chromatography

Size exclusion chromatography

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