The low intra-vial variability obtained for all PLA solutions demonstrates the excellent repeatability of the IVA Versa Analyzer. The combination of automated solvent handling, controlled dissolution conditions and dual-capillary differential viscometry minimizes experimental variability and ensures highly consistent intrinsic viscosity measurements.
When considering independent sample preparations, the intermediate precision remained at 0.57%, confirming the robustness of the complete analytical workflow. This result is particularly relevant for PLA characterization, where the absence of a dedicated international IV standard requires analytical methods capable of demonstrating their own reliability and consistency.
These results confirm that the IVA Versa provides a practical and reliable alternative to conventional manual glass viscometry, delivering excellent repeatability and intermediate precision while reducing operator dependency and improving laboratory safety and productivity.
Fig. 1.- Consistency of IV profiles obtained from independent PLA preparations.
Figure 1 shows the IV profiles obtained from six independently prepared PLA solutions. All traces exhibit very similar peak positions, peak shapes and signal intensities throughout the analysis range. The close overlap observed among the profiles indicates a high degree of consistency between sample preparations and analytical measurements.
No significant shifts, distortions or anomalous responses were observed, suggesting stable dissolution conditions and consistent instrument performance during the analysis sequence. The excellent agreement among the profiles is consistent with the low variability observed in the intrinsic viscosity measurements and supports the overall robustness of the analytical workflow.
