Viscosity detectors signal tracings

In operation, the viscometer of Figure 2 will generate two separate signal detector traces for recording. The differential log-anplifier will generate a viscosity (In hi) trace vdiile the concentration detector will generate a concentration (c) trace. 

Figure 11 illustrates an SEC separation of a sample of 3-conponent polystyrene mixture with the dual concentration and viscosity detectors of Figure 10. The top trace shows the concentration elution profile of the SEC separation as detected by a uv-photometer. The bottom trace records the same SEC separation, except with the viscometer signal from the log-amplifier output.

Figure 2. Signal tracings from the three detectors showing excess LS intensity, specific viscosity, and concentration signals, for a sample with a Flory-Schulz MWD, polydispersity of 2, and a Mark-Houwink exponent of 0.725.

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