Retention Time Precision
Molar mass averages can be affected by changes in the environment and measuring conditions. Generally, these variations are the result of one or more factors including flow rate reproducibility, baseline drift and injection reproducibility. In addition to controlling column temperature, Tosoh engineers added temperature control for both pumps and inlet and outlet tubing on the EcoSEC GPC System to deliver top GPC analysis performance.
Figure 1 demonstrates the superiority of the EcoSEC GPC System for the determination of weight-average molar masses.
Reproducibility of Mw analysis |
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Column: TSKgel SuperMultiporeHZ-M, 4 µm, 4.6 mm ID × 15 cm × 2
Mobile phase: THF
Flow rate: 0.35 mL/min
Detection: RI (EcoSEC GPC System)
Temperature: 40 °C
Injection vol.: 10 µL
Samples: poly(vinyl chloride-co-vinyl acetate) and polycaprolactone |
Figure 2 shows a comparison of Mw reproducibility for a sample injected 10 times a day for 5 days on the EcoSEC GPC System compared to a conventional GPC. The reproducibility of the EcoSEC GPC System was superior by a factor of 3 to that of the conventional GPC system.
Comparing Mw reproducibility of the EcoSEC GPC System and a conventional GPC system |
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Column: TSKgel SuperMultiporeHZ-M, 4 µm, 4.6 mm ID × 15 cm × 2
Mobile phase: THF
Flow rate: 0.35 mL/min
Detection: RI
Temperature: 40 °C
Injection vol.: 10 µL
Samples: poly(vinyl chloride-co-vinyl acetate) |