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SGIC 2D Frequently Asked Questions

We are aware that acquiring a lab instrument is an important decision, furthermore if Polyolefins’ research is related with your core business.

Although you can ask directly to our consultants whenever you want, you may prefer to know first the answers to the most typical questions about our instruments. Here are packed the most relevant questions about SGIC 2D.


Questions


Answers

What is the purpose of SGIC 2D instrument?
The Two-Dimensional Solvent Gradient Interaction Chromatograph (SGIC 2D) instrument performs a fractionation of the polymer according to composition by solvent gradient HPLC technique in adsorption mode followed by a second separation by Gel Permeation Chromatography (GPC/SEC) of the fractions eluted from the first dimension.
The SGIC (Solvent Gradient Interaction Chromatography) technique using carbon based adsorbents was developed by The DOW Chemical Company to characterize composition distribution in polyethylene copolymers. The SGIC 2D instrument by Polymer Char (sole licensee by The Dow Chemical Company to market this instrument), automates this technique by using a reliable hardware and a especially designed control software.

Does SGIC 2D provide physical fractions?
SGIC 2D is an analytical instrument designed to obtain the bivariate distribution in a three-dimensional plot as well as recovered GPC and TREF profiles in a fully automated way, but it doesn’t provide any physical fraction. It might be possible to collect the TREF fractions as they elute from the columns, however, the instrument is not optimized for this purpose and the process is not automated. Please refer to the PREP mc2 for an automated fractionation instrument.

How many samples can be run at a time and how long will they take?
Up to 42 samples can be run with no supervision required, in about 3 to 9 hours per sample depending on the desired resolution.

How many grams of sample do I need for a SGIC 2D analysis?
The standard amount used in SGIC 2D analysis is around 30mg.

Which solvents can be used?
1.2.4-Trichlorobenzene (TCB) and Orto-Dichlorobenzene (oDCB), decane, 1-decanol, ethylene glycol monobutylether (EGMBE), decaline, or others considering as a second dimension solvent to keep compatibility with the detector. To use other solvents please consult Polymer Char first.

What kind of sample preparation is required by the user?
No sample preparation is required by the user but weighing the dry samples and putting them inside of the vials in the autosampler tray. The rest of the steps are performed by the instrument automatically: filling, dissolution, column loading, solvents gradient, GPC columns injection, final cleaning, etc. Therefore, when a run is finished, another can be started immediately.

Do I need to handle solvents?
Solvents don’t need to be handled at any time; the whole process is fully automated and the instrument is in charge of all the needed steps: filling, dissolution, column loading, solvents gradient, GPC columns injection, final cleaning, etc.

Which is the detector used for concentration in SGIC 2D?
SGIC 2D incorporates an infrared detector to measure the concentration of each fraction going out of the column and then being injected into the GPC columns. This detector can be Polymer Char’s IR4 or IR5 in its OEM version and therefore composition information can be obtained simultaneously. The use of IR5 detector is Polymer Char's recommendation for this instrument thanks to its outstanding sensitivity both in concentration and in composition.

Where are the columns located?
SGIC 2D instrument incorporates an interaction chromatography column, which is located in the instrument top oven. GPC columns are located and isolated in the main oven, always kept at a constant high temperature for its optimum preservation.

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