THERMAL FIELD-FLOW

Currently, there are several molecular weight separation techniques, such as OTHdC, PCHdC, SEC, thermal field flow fractionation (ThFFF), and sedimentation field flow fractionation (SdFFF). The molecular weight separation range... [Pg.607]

SEC, size exclusion chromatography OTHdC, open tubular hydrodynamic chromatography PCHdC, packed column hydrodynamic chromatography ThFFF, thermal field flow fractionation. [Pg.609]

Venema, E., deLeeuw, P., Rraak, J.C., Poppe, H., Tijssen, R. (1997). Polymer characterization using online coupling of thermal field flow fractionation and hydrodynamic chromatography. J. Chromatogr. A 765(2), 135-144. [Pg.125]

Most data about the Ludwig-Soret effect of polymers in solution have been obtained from thermal field-flow fractionation (TFFF), developed by Giddings and coworkers [17,18]. TFFF is one member of the family of field-flow fractionation techniques, which are all characterized by a laminar flow of the polymer solution or colloidal suspension within a relatively narrow channel. An external field, which may be gravitation, cross-flow, or temperature as in TFFF, is applied... [Pg.4]

Column Parameters in Thermal Field-Flow Fractionation, M. E. Hovingh, G. E. [Pg.299]

Thermal Field-Flow Fractionation Extension to Lower Molecular Weight Separations by Increasing the Liquid Temperature Range Using a Pressurized System, J. C. Giddings, L. K. Smith, and M. N. Myers, Anal. Chem., 47, 2389 (1975). Flow Field-Flow Fractionation A Versatile New Separation Method, J. C. Giddings, F. J. Yang, and M. N. Myers, Science, 193, 1244 (1976). [Pg.299]

Thermal Field-Flow Fractionation Using Supercritical Fluids, J. J. Gunderson and J. [Pg.304]

Comparison of Polymer Resolution in Thermal Field-Flow Fractionation and Size Exclusion Chromatography, J. J. Gunderson and J. C. Giddings, Anal. Chim. Acta, 189, 1 (1986). [Pg.304]

Myers MN, Chen P, Giddings JC (1993) Polymer separation and molecular-weight distribution by thermal field-flow fractionation. In Provder T (ed) Chromatography of polymers characterization by SEC and FFF. American Chemical Society, Washington, DC, pp 47-62... [Pg.177]

Giddings JC, Kumar V, Williams PS, Myers MN (1990) Polymer separation by thermal field-flow fractionation high speed power programming. In Craver CD, Provder T (eds) Polymer characterization physical properties, spectroscopic, and chromatographic methods. American Chemical Society, Washington, DC, pp 1-21... [Pg.178]

Schimpf ME (1987) Characterization of polymers and their thermal diffusion by thermal field-flow fractionation. PhD Thesis, University of Utah, USA... [Pg.185]

In thermal field flow fractionation (TFFF), a temperature gradient is applied. The primary potential advantage of this technique is that it can be used to size particles in the range 0.01 pm to 0.001 pm, an order of magnitude smaller than SFFF. Fffractionation market a TFFF polymer fractionator channel module with 286/16 MHz IBM compatible PC, super VGA color monitor workstation to include data acquisition software, hardware and data analysis software. A linear UV detector and single channel high performance pump are optional. [Pg.282]

Determination of Molecular Weight and Size of Ultrahigh Molecular Weight Polymers Using Thermal Field-Flow Fractionation and Light Scattering... [Pg.93]

The early research of Myers et al. [1,2] shows that polymer thermal field-flow fractionation (ThFFF) retention and thermal diffusion are solvent dependent. Recently, Sisson and Giddings [3] indicated that polymer ThFFF retention could be increased by mixing solvents. Rue and Schimpf [4] extended the molecular-weight range that can be retained by ThFFF to much lower molecular weights (<10 kDa) by using solvent mixtures without using extreme experimental conditions. There are several other reports on the effect of solvents on polymer retention, selectivity, and the universal calibration in FFF in last few years [5]. [Pg.1506]

The retention of polymer molecules in thermal field-flow fractionation is determined by the diffusion coefficient and the thermal diffusion coefficient Dj, illustrated approximately by [8]... [Pg.1506]

Thermal FFF (thermal field-flow fractionation) is an elution-type separation technique applicable to the characterization of various synthetic organic polymers with molecular weights higher than about 10 [1], In thermal FFF, a dilute solution of polymer sample is injected into a thin ribbon-shaped flow channel across which an external field (in the form of a temperature gradient) is applied. Under the influence of the temperature gradient, different components of the sample are carried down the channel at different velocities, leading to the elution of different components at different times and separation is achieved. [Pg.1605]

Thermal field-flow fractionation (TFFF) belongs to the historically oldest subtechniques of FFF. It is based on the principle of thermal diffusion. In early works... [Pg.506]