Glass packing, porous

The porous glass packed columns did not yield high resolution separations, but the major species present in a latex were adequately separated. Figure 1. Insoluble polymer, when present, was excluded from the pores and eluted at interstitial volume. Elution order of remaining species was soluble polymer, unreacted monomers, and water. In both types of resins studied, no separation of the two unreacted monomers was achieved. A single chromatographic peak, that included both monomers, was obtained. 

In the investigation reported herein, an attempt has been made to maximize peak separation and minimize peak broadening for aqueous GPC of polyacrylamides with CPG porous glass packings. 

A. R. Cooper and J. F. Johnson, J. Appt Polym. Set, 13 1487 (1969). Gel Permeation Chromatography Effect of Treatment with Hexamethyldisilazane on Porous Glass Packings. 

Gel permeation chromatography experiments with aqueous polymer solutions under carefully controlled conditions may be used to characterize a number of widely different pol3nner types. Solvents may be chosen which "shrink" molecules to dimensions which are resolvable in commercially available porous glass packings. For a series... 

Fig I. Geometries for the formation of an internal solid surface in volume samples Stacked planar glass slides, porous materials, nonporous colloidal particle dispersions, and densely packed colloidal particles. 

Gaseous and particulate pollutants are withdrawn isoldnetically from an emission source and collected in a multicomponent sampling train. Principal components of the train include a high-efficiency glass- or quartz-fiber filter and a packed bed of porous polymeric adsorbent resin (typically XAD-2 or polyurethane foam for PCBs). The filter is used to collect organic-laden particulate materials and the porous polymeric resin to adsorb semivolatile organic species (com-... 

The term porosity refers to the fraction of the medium that contains the voids. When a fluid is passed over the medium, the fraction of the medium (i.e., the pores) that contributes to the flow is referred to as the effective porosity of the media. In a general sense, porous media are classified as either unconsolidated and consolidated and/or as ordered and random. Examples of unconsolidated media are sand, glass beads, catalyst pellets, column packing materials, soil, gravel and packing such as charcoal. 

Chromatographic Packings Prepared by Physical Adsorption of Polymers on Silica or Porous Glass... 

It is possible to build within the formation a porous pack that is a mixture of fibers and the proppant. The fibrous material may be any suitable material (e.g., natural or synthetic organic fibers, glass fibers, ceramic fibers, carbon fibers). 

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