Fractionation can be caused by a variety of chemical, biological, or physical processes and is employed in various areas of science, engineering and technology.
Fractionation systems are designed to separate an analyte from a sample into equal portions or fractions. It does so in accordance with either the analytes physical or chemical properties, such as by size, density, or bonding ability. In column chromatography, for example, fractionation occurs by difference of affinity whereas in cell fractionation, the cells components are fractioned out by difference in mass. Fractionation instruments provide hands-off, programable, and repeatable options for separating desired samples.
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| Company | Polymer Char | Polymer Char | Polymer Char | Polymer Char | Polymer Char |
| Item | TREF Instrument | CRYSTAF Instrument | CRYSTEX® QC Instrument | SGIC 2D Instrument | TGIC Instrument |
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| Catalog Number | TREF | CRYSTAF | CRYSTEX QC | SGIC 2D | TGIC |
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| Description | Temperature Rising Elution Fractionation has been the most comprehensive technique for the characterization of the Chemical Composition Distribution (CCD) in polyolefins, and Polymer Char’s TREF is the first fully automated apparatus implementing this technique.
TREF can be converted into a CRYSTAFTemperature Rising Elution Fractionation has been the most comprehensive technique for the characterization of the Chemical Composition Distribution (CCD) in polyolefins, and Polymer Char’s TREF is the first fully automated apparatus implementing this technique.
TREF can be converted into a CRYSTAF-TREF combined system capable of running both techniques by using the same hardware. Each technique can provide complementary information on the CCD in some complex resins.
Features - Full automation of the TREF techniques to measure the CCD
- 5 samples can be analyzed sequentially with no supervision required, with an analysis time of 6 hours per sample.
- Possibility of adding other detectors like Viscometer or Light Scattering.
- Easy convertible into a CRYSTAF-TREF apparatus.
- Possibility of subambient operation (down to -20ºC) for low crystallinity samples.
... Read More | CRYSTAF instrument performs Crystallization Analysis Fractionation technique to separate the polymer by its comonomer content. The process is done in a single temperature ramp, while the polymer solution concentration is monitored by using the infrared detector IR4 of Polymer Char.
CRYSTAF can be CRYSTAF instrument performs Crystallization Analysis Fractionation technique to separate the polymer by its comonomer content. The process is done in a single temperature ramp, while the polymer solution concentration is monitored by using the infrared detector IR4 of Polymer Char.
CRYSTAF can be converted into a CRYSTAF-TREF combined system capable of running both techniques by using the same hardware. Each technique can provide complementary information on the CCD in some complex resins.
Features - Full automation of the CRYSTAF technique to measure the CCD
- Analysis of 5 samples in 8 hours.
- Convertible into a CRYSTAF-TREF apparatus.
- Possibility of subambient operation (down to -20ºC) for low crystallinity samples.
... Read More | CRYSTEX® QC measures the Soluble Fraction % (amorphous fraction) in polypropylene and other polyolefin resins.
This instrument is an automated alternative to the traditional wet chemistry method based on xylene solubility, known for being time consuming and requiring constant manual CRYSTEX® QC measures the Soluble Fraction % (amorphous fraction) in polypropylene and other polyolefin resins.
This instrument is an automated alternative to the traditional wet chemistry method based on xylene solubility, known for being time consuming and requiring constant manual handling of solvent at high temperature. CRYSTEX® QC is easy to operate and obtains the amorphous phase content in a short time. It eliminates the need to handle solvent manually and uses less flammable solvents than Xylene (TCB or oDCB), increasing the safety level in the laboratory.
The instrument automates the entire analysis process, including dissolution, separation of the soluble fraction from the crystalline matrix, and analysis by the online detectors.
Precise quantification is achieved by means of an infrared detector that also delivers ethylene content information. Moreover, the instrument measures intrinsic viscosity by means of a built-in dual capillary viscometer. All results (concentration, ethylene content and intrinsic viscosity) are obtained for the whole sample, the amorphous fraction, and the crystalline fraction.
Up to 4g of polymer can be analyzed, one sample at a time with CRYSTEX QC. For an equally automated analysis of multiple samples (up to 42), known to be homogenous (pelletized), can be performed using the same technology in the CRYSTEX® 42.
Features - Fully-automated analysis of the soluble (amorphous) fraction in polypropylene and other polyolefins.
- A sample can be analyzed every 2.5 hours (including dissolution and rinsing time) without manual operation.
- No need for accurate weighing of sample nor manual solvent handling.
- No external filtration nor solvent evaporation required.
- Additional measurement of ethylene content and intrinsic viscosity for the fraction, the crystalline fraction, and whole sample.
- For Process /QC laboratories in production plants.
- Compatible with other polyolefin materials such as LDPE, and adaptable to other solubility tests (heptane or hexane solubles).
... Read More | The Two-Dimensional Solvent Gradient Interaction Chromatograph (SGIC 2D) instrument is the only high temperature SGIC equipment commercially available. The system performs an analytical fractionation of the polymer according to chemical composition by selective adsorption/desorption on a HPLC columnThe Two-Dimensional Solvent Gradient Interaction Chromatograph (SGIC 2D) instrument is the only high temperature SGIC equipment commercially available. The system 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.
The instrument is fully automated and the whole process is controlled by the virtual instrumentation software. 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 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.
The composition molar mass interdependence is measured in hours instead of days, with limited solvent consumption and no manual intervention, in an intrinsically safe set-up.
Features - Fully automated instrument to measure the chemical composition – molar mass interdependence of complex and functional Polyolefins.
- Of special interest for polar or low crystallinity Polyolefins.
- Detection performed in TCB and in isocratic mode: a linear IR detector can be used instead of a non-linear ELSD. Compatible with molar-mass
- -sensitive detectors.
- No solvents handling, fully automated process, including in-line filtration.
- Flexible definition of the number of fractions and the solvent gradient profile.
- Bivariate distribution results presented as contour or 3D surface graphs.
- Automated analysis of a sequence of samples, with flexibility to use different methods for each one.
... Read More | The TGIC Instrument is a fully automated Thermal Gradient Interaction Chromatograph Instrument for measuring Composition Distribution in Elastomers and Low Crystallinity Polyolefin Copolymers.
Features - Fully automated operation with no manual solvent handling. Integrated vial filling with solvent,
The TGIC Instrument is a fully automated Thermal Gradient Interaction Chromatograph Instrument for measuring Composition Distribution in Elastomers and Low Crystallinity Polyolefin Copolymers.
Features - Fully automated operation with no manual solvent handling. Integrated vial filling with solvent, sample dissolution and in-line filtration.
- Fast analysis time of around 2-3 hours including sample dissolution.
- Analysis of up to 42 samples sequentially, with the possibility of using different methods each one.
- Both TGIC and CEF analyses can be performed in the same instrument with dedicated software packages.
- Easy incorporation of Polymer Char’s on-line Viscometer for composition molar mass interdependence.
- Option to integrate IR5 MCT detector for maximum sensitivity in both concentration and composition signals.
... Read More |
| Type | Temperature Rising Elution Fractionation | Crystallization Analysis Fractionation | Soluble Fraction Determination, Amporphous Content Measure, Quality Control, Production Control | Two-Dimensional Solvent Gradient Interaction Chromatograph | Thermal Gradient Interaction Chromatography |
| Applications | Chemical Composition Distribution (CCD) in Polyolefins | Chemical Composition Distribution (CCD) in Polyolefins | Inquire | Analysis of samples of low crystallinity or complex polarity distribution | Measuring Composition Distribution in Elastomers and Low Crystallinity Polyolefin Copolymers |
| Detector(s) | Infrared Detector IR4 and Viscometer | Infrared Detector IR4 | Infrared Detector IR4 | Infrared Detector IR4 and IR5 MCT | Infrared Detector IR4 and IR5 MCT, Viscometer |
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