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TGIC 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 TGIC.


Questions


Answers

What is the purpose of TGIC instrument?
TGIC (Thermal Gradient Interaction Chromatography) technique using carbon based adsorbents was developed by The DOW Chemical Company to characterize composition distribution in polyethylene copolymers.
Polymer Char, unique licensee by The Dow Chemical Company to market this instrument, automates this technique by using a simple and reliable hardware and a especially designed control software.

Can I perform TREF and/or CEF techniques in my TGIC instrument?
Yes, that is possible because TGIC technique is carried out in a CEF instrument that can perform CEF and TREF techniques.

How many samples can be run at a time and how long will it take?
Up to 42 vials can be handled by the instrument autosampler, and they can be dissolved and analyzed with no supervision required. Each sample can be analyzed with different conditions, so the total time will depend on the analysis method selected for each sample.

How many grams of sample do I need for a TGIC analysis?
The standard amount used in TGIC analysis is 32mg per sample in 8 mL, therefore the instrument can be used both for research and also for quality control.

Which solvents can be used?
1.2.4-Trichlorobenzene (TCB) and Orto-Dichlorobenzene (oDCB) are the most commonly used solvents. Perchloroethylene could be used too. To use other solvents please consult Polymer Char first.

What kind of sample preparation is required by the user? How is the sample prepared?
No sample preparation is required by the user other than weighing the dry samples and putting them inside of the disposable glass vials. The rest of the steps are performed by the instrument automatically: vials filling, dissolution, filtration, injection, elution, etc.

May I use different analysis conditions for each vial within the same run?
Yes; different analysis conditions can be selected from the software for each vial within the same run, therefore, different samples can be analyzed unattended and with the appropriate dissolution time, crystallization ramp, elution ramp, pump flow, etc.

Do I need to handle solvents?
Solvents don't need to be handled at any time; the whole process is fully automated, the instrument is in charge of all the needed steps: vials filling, dissolution, filtration, injection, elution, etc.

Do I need to prefilter the samples out of the instrument?
No prefiltration step is required thanks to an in-line filter, which is integrated in the instrument as an option, connected before the TGIC column. Additionally, after each injection, this filter is automatically rinsed with a backflush to become ready and clean again for the next injection.

Which detector is used for the concentration measurement?
The instrument incorporates an infrared detector to measure the concentration of the solution that is being eluted and going out of the column. This detector can be Polymer Char's IR4 or IR5 in their integrated versions.

Can I couple additional detectors to TGIC?
A capillary viscometer detector can be connected to the instrument, to obtain information on composition-molar mass interdependence.

How can I access and review my results?
After each injection, data can immediately be accessed and calculated through the software database. Polymer Char TGIC Calculations software integrates all detectors signals in the same package. A reporting tool is available to generate reports in Excel adapted to each user needs.

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