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SGIC 2D Overview

The Two-Dimensional Solvent Gradient Interaction Chromatograph (SGIC 2D) instrument performs an analytical fractionation of the polymer according to chemical composition by selective adsorption/desorption on a HPLC column, followed by a second separation according to molar mass on a GPC/SEC column, being the only high temperature SGIC system available in the market.

The instrument is fully automated and the whole process is controlled by the virtual instrumentation software. Once the vials with the dry polymer samples are placed in the autosampler's external tray, the instrument takes care of the vial-filling with solvent, dissolution with gentle shaking, optional in-line filtration, and injection into the HPLC column. Then the solvent gradient program starts, and the resulting fractions are injected towards the GPC/SEC columns.

The detection is done by a standard infrared detector at the exit of the GPC/SEC columns, which provides a linear response and an outstanding stability, overcoming this way the limitations in detection found in single dimension SGIC due to the varying mobile phase composition (using TCB as second solvent).

At the end of the analysis, the two-dimensional distribution interrelating molar mass and chemical composition is obtained. This combined information is often required for comprehensive characterization of complex materials. The SGIC 2D is especially suitable for the analysis of samples of low crystallinity or complex polarity distribution, when the classic cross-fractionation technique based on crystallization (TREF-GPC) does not provide the desired separation.

Polymer Char's analytical SGIC 2D instrument is a practical alternative to preparative fractionation methods, which are sometimes tedious and time consuming. The composition molar mass interdependence is now measured in hours instead of days, with limited solvent consumption and no manual intervention, in an intrinsically safe set-up.

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