Analytical Instrumentation

  • Fully-automated high-temperature GPC/SEC system with highly sensitive infrared detector for molar mass distribution and chemical composition analysis of polyolefins

Fully-automated high-temperature GPC/SEC system with highly sensitive infrared detector for molar mass distribution and chemical composition analysis of polyolefins

Aug 13 2019 Read 199 Times

With extensive experience in the development of high-temperature instruments for polyolefin analysis, Polymer Char offers the GPC-IR® instrument, a reliable multiple detector Gel Permeation

Chromatography (GPC) system dedicated to the characterisation of polyolefins. It can be integrated with one of two options of high-stability infrared (IR) detectors with outstanding baseline and simultaneous detection of total concentration and chemical composition, which adds a new dimension to the GPC analysis. The built-in IR detection provides the most comprehensive characterization of polymers such as HDPE, PP, LDPE, LLDPE, EP copolymers, EVA, EBA and others in the group of polyolefins.

The two different infrared detectors available are: IR5 MCT, with enhanced sensitivity and stability to measure concentration and chemical composition (SCB/1000TC); and the classic IR4, which offers a broader spectral range enabling the analysis of the carbonyl group containing copolymers. Other detectors that can be coupled to the GPC-IR® system are Polymer Char’s four-capillary bridge viscometer and a Multi-Angle Light Scattering for the determination of absolute molar mass and study of Long Chain Branching (LCB). This triple-detection system thus, provides the most complete and comprehensive results for polyolefin characterization.

Additionally, Polymer Char’s GPC-IR® brings forth a level of automation that adds reliability to the final results. The instrument automatically performs all sample preparation steps including the initial filling of vials with solvent and in-line filtration. As a result, neither vial transfer nor manual handling of solvent is required throughout the whole analytical process. Other key automation features are incorporated to overcome historical problems usually arisen when working with high-temperature GPC/SEC analysis, including the company’s Sample Care protocols that preserve the integrity of the sample along the whole analytical cycle.

Finally, data processing becomes simple and powerful thanks to the GPC One® Software, a comprehensive calculations software package developed in collaboration with the industry leaders that integrates all detectors’ signals.

Polymer Char’s GPC-IR® stands as a new generation of instruments for polyolefin characterization in terms of repeatability, automation, and reliability.

Simplified and fully-automated high-temperature GPC instrument aimed at control laboratories in the polyolefin industry

GPC-QC high-temperature GPC instrument for quality control in polyolefin manufacturing lines. The instrument has a compact and simple design with a reliable approach based on Polymer Char’s recently developed QC platform, and it provides robust and precise Molar Mass Distribution for process control.

For quality control purposes, the industry has traditionally relied on physical parameters related to an average of the MMD, such as melt flow index (MFI) and density. These parameters are not enough when producing complex multiple reaction products, some of them having multimodal MMD. It is in these occasions when GPC-QC can provide significant value by measuring the whole MMD. GPC-QC delivers the complete Molar Mass Distribution for one sample through a simplified workflow, while keeping a fully-automated sample preparation and an analysis free of manual solvent handling throughout the entire process. The complete analysis takes 30 minutes including dissolution.

The IR detection, implemented in the instrument through Polymer Char’s integrated IR4 or IR5 MCT detectors, is highly stable, contributing to the overall reliability of the instrument.

The IR detector also provides simultaneous chemical composition information, which is key for controlling the production of heterogeneous resins. Moreover, for a truly complete analysis, the instrument can also measure intrinsic viscosity by means of a built-in dual-capillary viscometer that can be incorporated as an additional feature. Important applications for GPC-QC are:  pilot plants, plant start-ups, monitoring grade changes in multi-reactor processes, monitoring the microstructure of pipe resins, and processors’ laboratories.



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