By Prof. Sadao Mori, Dr. Howard G. Barth (auth.)
Although dimension exclusion chromatography (SEC) may be the preferred and regularly occurring approach for selecting the molecular weight distribution of polymeric fabrics, there were only a few texts written in this subject. up to now decade, SEC has skilled a large amount of progress in regard to column and detector know-how and new purposes. With those advances, SEC can now be used for deciding upon absolute molecular weight, polymer chain conformation and measurement, and branching, in addition to polymer answer houses. This e-book introduces the reader to the basics of SEC with emphasis on sensible features of the approach, resembling column and cellular choice, calibration, new detector features and instructions for appearing SEC on so much kinds of polymers, in particular these of business significance. This publication is meant for both these new to the sector of SEC, or for these learn employees who require a extra finished background.
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Extra info for Size Exclusion Chromatography
3. Schematic diagram of a deflection-type differential refractometer. a light source, b mask, c lens, d cell, e mirror,! optical zero glass, g optical zero adjust knob, h photocell 40 3 Instrumentation mum of the knob turn when a solvent having lower or higher RI is used as the mobile phase, then the sensitivity decreases, the maximum case being onetenth. When the position of the optical zero glass is inadequate to obtain the desired zero signal, mirror adjustments must be made by turning the mirror adjust screws slightly.
Minimum slope, the pore volume should be as large as possible. This effect can be best explained using Fig. 9 . Here we see calibration curves from a single column (Fig. 6 ml per decade of MW. The two-column set has twice the selectivity or 40% higher resolution (see Eq. 28)). As discussed in the following section, the third requirement for optimum resolution is column efficiency. 9. 2 Peak Broadening As a polymer elutes through a column, it will be fractionated on the basis of molecular size by the SEC process.
3 illustrates its principle of operation. A light beam from a light source (a tungsten filament lamp) passes through an optical mask and is collimated by a lens. The parallel beam passes through a cell that consists of sample and reference sections separated by a dividing glass plate. The incident beam is deflected at the cell, reflected by the mirror, and again deflected as it passes back through the cell. The light beam then passes through the lens and on to the photocell via the optical zero glass.
Size Exclusion Chromatography by Prof. Sadao Mori, Dr. Howard G. Barth (auth.)