Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Chromatography permeation

Gel permeation chromatography, exclusion chromatography. gel filtration chromatography. A technique for separating the components of a mixture according to molecular volume differences. A porous solid phase (a polymer, molecular sieve) is used which can physically entrap small molecules in the pores whilst large molecules pass down the column more rapidly. A solvent pressure up to 1000 psi may be used. [Pg.98]

Two classes of micron-sized stationary phases have been encountered in this section silica particles and cross-linked polymer resin beads. Both materials are porous, with pore sizes ranging from approximately 50 to 4000 A for silica particles and from 50 to 1,000,000 A for divinylbenzene cross-linked polystyrene resins. In size-exclusion chromatography, also called molecular-exclusion or gel-permeation chromatography, separation is based on the solute s ability to enter into the pores of the column packing. Smaller solutes spend proportionally more time within the pores and, consequently, take longer to elute from the column. [Pg.593]

At first glance, the contents of Chap. 9 read like a catchall for unrelated topics. In it we examine the intrinsic viscosity of polymer solutions, the diffusion coefficient, the sedimentation coefficient, sedimentation equilibrium, and gel permeation chromatography. While all of these techniques can be related in one way or another to the molecular weight of the polymer, the more fundamental unifying principle which connects these topics is their common dependence on the spatial extension of the molecules. The radius of gyration is the parameter of interest in this context, and the intrinsic viscosity in particular can be interpreted to give a value for this important quantity. The experimental techniques discussed in Chap. 9 have been used extensively in the study of biopolymers. [Pg.496]

This chapter contains one of the more diverse assortments of topics of any chapter in the volume. In it we discuss the viscosity of polymer solutions, especially the intrinsic viscosity the diffusion and sedimentation behavior of polymers, including the equilibrium between the two and the analysis of polymers by gel permeation chromatography (GPC). At first glance these seem to be rather unrelated topics, but features they all share are a dependence on the spatial extension of the molecules in solution and applicability to molecular weight determination. [Pg.583]

Gel permeation chromatography (GPC) is the term found most widely in the polymer literature. In this context it is used most widely as an analytical... [Pg.642]

Salt Effects. The definition of a capacity factor k in hydrophobic interaction chromatography is analogous to the distribution coefficient, in gel permeation chromatography ... [Pg.56]

Bentone-34 has commonly been used in packed columns (138—139). The retention indices of many benzene homologues on squalane have been determined (140). Gas chromatography of C —aromatic compounds using a Ucon B550X-coated capillary column is discussed in Reference 141. A variety of other separation media have also been used, including phthaUc acids (142), Hquid crystals (143), and Werner complexes (144). Gel permeation chromatography of alkylbenzenes and the separation of the Cg aromatics treated with zeofltes ate described in References 145—148. [Pg.424]

MFI = melt flow index IV = intrinsic viscosity in CH2CI2 at 25°C From gel-permeation chromatography using polystyrene standards. [Pg.280]

Fig. 3. Molecular weight distribution curves as determined by gel-permeation chromatography. A represents i9f2v (9-phthahc resins B, highest molecular... Fig. 3. Molecular weight distribution curves as determined by gel-permeation chromatography. A represents i9f2v (9-phthahc resins B, highest molecular...

See other pages where Chromatography permeation is mentioned: [Pg.501]    [Pg.431]    [Pg.537]    [Pg.642]    [Pg.642]    [Pg.642]    [Pg.643]    [Pg.647]    [Pg.649]    [Pg.651]    [Pg.437]    [Pg.43]    [Pg.49]    [Pg.49]    [Pg.53]    [Pg.139]    [Pg.144]    [Pg.192]    [Pg.276]    [Pg.332]    [Pg.539]    [Pg.24]    [Pg.25]    [Pg.300]    [Pg.368]    [Pg.390]    [Pg.403]    [Pg.408]    [Pg.11]    [Pg.166]    [Pg.172]    [Pg.300]    [Pg.149]    [Pg.279]    [Pg.280]    [Pg.343]    [Pg.360]    [Pg.366]    [Pg.431]   
See also in sourсe #XX -- [ Pg.81 ]




SEARCH



Cell permeation chromatography

EXPERIMENT 4 GEL PERMEATION CHROMATOGRAPHY USING DUAL DETECTORS (UV AND Rl)

Exclusion chromatography gel permeation

Fractionation and gel permeation chromatography

Fractionation gel permeation chromatography

Fractionation of Polyacrylamide by Gel Permeation Chromatography in Water

Gel Permeation (or Size-Exclusion) Chromatography (GPC, SEC)

Gel permeation chromatography

Gel permeation chromatography Curve

Gel permeation chromatography GPC columns

Gel permeation chromatography GPC) method

Gel permeation chromatography analysis

Gel permeation chromatography calibration curve

Gel permeation chromatography elution curves

Gel permeation chromatography experiment

Gel permeation chromatography of polymers

Gel permeation chromatography studies

Gel permeation chromatography technique

Gel permeation chromatography, GPC

Gel permeation chromatography-mass spectrometry

Gel permeation/size exclusion chromatography

Gel-Permeation Chromatography (GPC) and Analysis of Plastics Additives

Gel-filtration/permeation chromatography

Gel-permeation chromatography (GPC separations

Gel-permeation chromatography apparatus

Gel-permeation chromatography system

High pressure gel permeation chromatography

High-performance gel permeation chromatography

High-temperature gel permeation chromatography

In gel permeation chromatography

Measurement by gel permeation chromatography

Methods gel-permeation chromatography

Molar mass determination permeation chromatography

Molecular weight by Gel permeation chromatography

Molecular weight determination by gel permeation chromatography

Multidetection gel permeation chromatography

Poly permeation chromatography

Polymer gel-permeation chromatography

Polymerisation kinetics by gel permeation chromatography (GPC)

Size exclusion chromatography total permeation

Suspension polymerization gel permeation chromatography

© 2024 chempedia.info