TGIC Analytical Services

Overview

High-Temperature HPLC has become recently available for the analysis of polyolefins, a field where it is better known under the name of Interaction Chromatography. It was first used in Solvent Gradient Interaction Chromatography mode (SGIC) and it is today extended with the use of a thermal gradient instead, also known as Thermal Gradient Interaction Chromatography (TGIC).

The TGIC technique using carbon-based adsorbents was developed by The Dow Chemical Company to characterize the composition distribution in polyethylene copolymers. This technique requires a cooling (adsorption) and a heating (desorption) step. Elution of the sample takes place in that last heating step, observing a linear dependence of comonomer content to desorption temperatures in a similar manner to TREF and CEF, and being molar mass-independent above 20,000 Da. TGIC will adsorb polymer molecules by the level of molecular surface in contact with the surface of the adsorbent, thus it may discriminate polymers by the level of irregularities in the chain, in a similar approach to crystallization techniques. TGIC, however, separates by adsorption and no co-elution is expected.

Resolution in TGIC is lower than in crystallization techniques but it has the possibility to extend the range of polymers to be analyzed towards the amorphous region which is limited by crystallization techniques. Then, the analyses of elastomers and other amorphous polyolefins are the main application of TGIC. TGIC is performed with a single solvent, typically o-DCB or 1, 2, 4 TCB in a Crystallization Elution Fractionation instrument (CEF) with the standard autosampler, injection system and an infrared detector, only requiring to replace the TREF column by a TGIC column.

Additional Detectors

These detectors are also used in some of our TGIC analyses:

C=O Content by IR4

C=O Content by IR4

A Carbonyls sensitive sensor can be incorporated in the infrared detector to measure the C=O/1000C tendency versus the molar mass distribution. (Depending on instrument availability)

Composition by IR5

Composition by IR5

When analyzing HDPE pipe resins, high sensitivity is required to be capable of measuring the low number of branches accurately. IR5 MCT detector was designed for this specific purpose and it is very powerful when characterizing that kind of resins.

IR6

IR6

The IR6 Detector is the latest IR Detector developed by Polymer Char with same capabilities and features than IR5 detector and the additional capability of measuring carbonyls group in the band of 1740 cm-1. IR6 Detector is recommended for users willing to analyze polyolefin type EVA, EBA, and others with carbonyls group present in IR band above.

Viscometer

Viscometer

By connecting a capillary Viscometer to a TGIC when analyzing polyolefins, the bulk Intrinsic Viscosity (IV) can be determined. The IV is provided as a function of Molar Mass (MM), and then the Universal Calibration (UC) is applied, for samples with different molecular structures.

TGIC Analytical Services Fees

CEF (Price/Sample)1-5 samples6-10 samples>10 samples
Standard (20-2-0.5)514€426€391€
Additional Services:
Subambient123€123€123€
Carbon Black178€178€178€
Additional Detectors:
Composition176€147€147€
Viscometer176€147€147€
Calibration for IR5 Composition186€ (only for the first sample)
Calibration for Viscometer109€ (only for the first sample)
Minimum sample amount>1 g

Analytical Services Frequently Asked Questions


The fractionation service is available thanks to the Instruments PREP mc2 and PREP C20, capable of fractionating samples by molecular weight or by composition (TREF or CRYSTAF). Please visit the link Preparative Fractionation for more information.

The resulting fractions are later analyzed by the corresponding technique (GPC or TREF/CRYSTAF) to check the good performance of the fractionation process. Finally, the physical fractions are sent back to the customer by courier service as well as the analysis results of the fractions, so the customer can check the separation.

For most of our analyses, you will receive a summary of the results along with an Excel file. However, the type of data and report form depends on the analytical service made. For specifics about the information sent, contact analyticalservices@polymerchar.com.

Please send an email to analyticalservices@polymerchar.com and we will be pleased to help you.

To order any analytical service, please fill in the Analytical Service Request Form. Provide all the information available about the samples to be analyzed. Sent forms will be processed as formal orders for Polymer Char records. All the information provided is considered confidential information.

If a previous quotation is required, please do not hesitate to let us know by sending an email to analyticalservices@polymerchar.com

Samples should be shipped to:

Polymer Characterization S.A.
Valencia Technology Park
Gustave Eiffel 8
Paterna, Valencia
E-46980, Spain
Attn.: Analytical Services Department

We highly recommend to use courier service instead of post mail to ensure your samples arrive in good condition.

The standard response time is 3 weeks. This time is approximate and depends on the analysis queue in the laboratory at the time of the order. Polymer Char will inform the customer at the time of the order in case the response time is expected to be longer.

Urgent services (results sent within 10 days from the samples receipt) might be requested with a 50% surcharge. Please consult with Polymer Char the availability of this service and delivery time at the time of the order.

Please refer to our Analytical Services Terms and in the first chapter, you will find the necessary amount for each technique.

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