Differential refractive index traces

Figure 4 shows the differential refractive index traces obtained for an unexposed film (trace A) and a film exposed to 300 mJ/cn (trace B). The peak labeled PAG is attributed to the unphotolyzed photoactive compound. This peak disappears after... [Pg.295]

Figure 4.25 A typical gel permeation chromatogram. The lower trace with short vertical lines is the differential refractive index while the upper curve is an absorption plot at a fixed ultraviolet frequency. The short vertical lines are syphon dumps numbered consecutively from the time of injection of the sample. The units of the ordinate depend on the detector, while those of the abscissa can be in terms of syphon volumes (counts) or volume of solvent.

$Figure 4.25 A typical gel permeation chromatogram. The lower trace with short vertical lines is the differential refractive index while the upper curve is an absorption plot at a fixed ultraviolet frequency. The short vertical lines are syphon dumps numbered consecutively from the time of injection of the sample. The units of the ordinate depend on the detector, while those of the abscissa can be in terms of syphon volumes (counts) or volume of solvent.$

Figure 4.6 Aqueous SEC of 2a. Differential refractive index detector (dRI) and differential viscometric detector (Vise.) traces are shown in black and gray, respectively.

$Figure 4.6 Aqueous SEC of 2a. Differential refractive index detector (dRI) and differential viscometric detector (Vise.) traces are shown in black and gray, respectively.$

Toluene extracts of a silicone rubber revealed three major molar mass fractions at 210 kDa, 1,490 Da, and 300 Da, as shown in the GPC trace (using differential refractive index detection) in Fig. 8a. (35) This represents a broad MMD which is beyond the capability of MS to determine accurately. Most of... [Pg.184]

High pressure liquid chromatography is frequently used to separate and identify trace element compounds. A common detector for liquid chromatographs is the differential refractive index detector that is not element-specific. To achieve separation, mobile phase gradients or sudden changes in the composition of mobile phases are frequently needed. The differential refractive index detector will often not be able to compensate for changes in the refractive index of the mobile phase and. [Pg.25]

Application of Theory to GPC Trace Equations 6 and 9 describe the molecular weight distribution of molecules produced during polymerization. Since In gel permeation chromatography the refractive index difference is proportional to the mass of material present, the equations have to be modified to express the polymer weight and also the differential refractive increment. This requires that besides... [Pg.237]

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