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Polymers size exclusion chromatography

Trathnigg, B., Feichtenhofer, S., and Kollroser, M., Quantitation in liquid chromatography of polymers size-exclusion chromatography with dual detection, /. Chromatogr. A, 786, 75, 1997. [Pg.381]

Even with condensed tannins, one finds that very mildly acidic conditions can cause anthocyanin groups to split off the polymer. Size exclusion chromatography of condensed tannins (Thompson et al., 1972) always reveals mixtures of oligomers. What is the true tannin molecule ... [Pg.469]

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]

Stmctural and chemical modification of urethane containing polymer matri-ces with macrocycles - calixarenes having reactive hydrazide groups have been carried out and stmcture, physico chemical and sensor properties of polyure-thanesemicarbazides (PUS) synthesised have been studied. The polymers obtained (on the base of polypropylene glycol MM 1000 and polysiloxane diol MM 860, hexamethylene diisocyanate and calixarene dihydrazide) are identified by IR-spectroscopy, size exclusion chromatography (SEC), DSC, WAXS and SAXS methods. [Pg.327]

PREPARATION OF BEADED ORGANIC POLYMERS AND THEIR APPLICATIONS IN SIZE EXCLUSION CHROMATOGRAPHY... [Pg.3]

Microspherical polymer beads are widely used as packing materials for chromatography and a variety of other applications. Size exclusion chromatography is based on pore size and pore-size distribution of microbeads to separate... [Pg.5]

Heitz et al. (33) also described the preparation of polyvinyl acetate cross-linked with butanediol divinyl ether. The polymer is the base of the Merckogel series of size exclusion chromatography packings, and its hydrolyzed derivative, polyvinyl alcohol, is marketed as Fractogel and Toyopearls. [Pg.9]

A trend in chromatography has been to use monosized particles as supports for ion-exchange and size-exclusion chromatography and to minimize the column size, such as using a 15 X 4.6-mm column packed with 3-/rm polymer particles for size exclusion chromatography. The more efficient and lower back pressure of monosized particles is applied in the separation. [Pg.23]

II. AMERICAN POLYMER GEL-PERMEATION/SIZE EXCLUSION CHROMATOGRAPHY (GPC/SEC) COLUMN REPACKING... [Pg.160]

Showa Denko K.K. started the Shodex HPLC business in 1973 by developing columns to determine the molecular weight distributions of polymers produced at its petrochemical plant. Since then, more than 600 items of columns have been developed to achieve various kinds of analyses. Among them are several series of columns that can be used for size exclusion chromatography. The abundant variety of columns is one of the important characteristics of Shodex. Any kind of analytical requirements can be satisfied by choosing the appropriate column supplied by Showa Denko. [Pg.171]

The packed columns of Shodex OHpak SB-800HQ series are packed with polyhydroxymethacrylate gels and are designed for use with high-resolution, high-speed aqueous size exclusion chromatography. The packed columns are best suited for the analysis of water-soluble polymers and proteins (Table 6.8). [Pg.193]

High-performance size exclusion chromatography is used for the characterization of copolymers, as well as for biopolymers (3). The packings for analyses of water-soluble polymers mainly consist of 5- to 10-/Am particles derived from deactivated silica or hydrophilic polymeric supports. For the investigation of organosoluble polymers, cross-linked polystyrene beads are still the column packing of choice. [Pg.219]

DESIGN, PROPERTIES, AND TESTING OF POLYMER STANDARDS SERVICE SIZE EXCLUSION CHROMATOGRAPHY (SEC) COLUMNS AND OPTIMIZATION OF SEC SEPARATIONS... [Pg.267]

Size exclusion chromatography (SEC, also known as GPC and GFC) has become a very well accepted separation method since its introduction in the late-1950s by works of Porath and Flodin (1) and Moore (2). Polymers Standards Service (PSS) packings for SEC/SEC columns share this long-standing tradition as universal and stable sorbents for all types of polymer applications. In general, PSS SEC columns are filled with spherical, macroporous cross-linked, pressure-stable, and pH-resistant polymeric gels. [Pg.267]

For the classical form of size exclusion chromatography in organic solvents, packings based on highly cross-linked styrene-divinylbenzene are used. For SEC of polar polymers using polar or aqueous solvents, packings based on a polar methacrylate polymer are used. Diol-derivatized silica is used for the separation of proteins and other polar polymers. The different packings will be discussed in sections dedicated to their different application areas. [Pg.326]

SIZE EXCLUSION CHROMATOGRAPHY COLUMNS FROM POLYMER LABORATORIES... [Pg.349]

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See also in sourсe #XX -- [ Pg.4 ]



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