Polyethylene and Polypropylene are so-called Polyolefins. They are produced in large amounts every year. Depending on the process and catalyst used linear or branched polymers can be produced. In case of e. g. Polyethylene there are at least three po more
Polyolefins: Determination of Molecular Weight and Branching Structure by GPC/SECG. Heinzmann, B. Tartsch,
Viscotek, a Malvern Company
Malvern Instruments GmbH
Polyethylene and Polypropylene are so-called Polyolefins. They are produced in large amounts every year. Depending on the process and catalyst used linear or branched polymers can be produced. In case of e. g. Polyethylene there are at least three polymer types: HDPE (High Density Polytheylene), LDPE (Low Density Polyethylene) and LLDPE (Linear Low Density Polytehylene). HDPE and LLDPE are made of linear or only slightly branched macromolecules with a high level of crystallinity. They form a dense structure in the final product. LDPE is made of highly branched molecules that form a final structure with low density due to a low degree of crystallinity. To analyse the different Polyethylene structures a High Temperature GPC/SEC-System is used with Triple Detection (Low Angle Light Scattering, Viscosity Detection and Refractive Index Detection). With such a system the molecular weight distribution and branching structure of polyolefins can be determined. Therefore it can easily be analysed what kind of structure a polyolefin sample has.
Read the complete article in German here .
Dynamic Light Scattering (DLS) is an established technique in the field of protein crystallography. DLS is used to measure hydrodynamic sizes, polydispersities and aggregation effects of protein samples. These are important parameters for the crystal more
Full automation of the Morphologi G3, using Standard Operating Procedures (SOP), eliminates any user bias inherent in manual microscopy methods more
The Morphologi® G3 automated particle characterization system from Malvern® Instruments is a new analytical tool that provides high quality, statistically significant particle size and shape information. New fully automated sample dispersion device A novel fully integrated dry powder disper ... more
A collaboration between Malvern Instruments and Bio-Radhas delivered new analytical tools for the rapid identification of unknown particles. New software to support Malvern’s Morphologi G3-ID, which analyzes particle size, shape and chemical composition, enables the direct comparison of mea ... more
Malvern Instruments has established a new biopharmaceutical applications laboratory in the heart of San Diego’s biotechnology cluster. The new laboratory will enable customers and Malvern applications specialists alike to experience and use Malvern’s range of specialist biophysical characte ... more
Malvern Instruments Ltd has announced that it has completed the acquisition of MicroCal from GE Healthcare Life Sciences and has also purchased the Archimedes particle characterization system from Affinity Biosensors LLC (Santa Barbara, CA). Both of these developments extend Malvern’s portf ... more
Thresholding, dilation, erosion, reporting - these are some of the terms used in image analysis. We'll explain some of the mathematics used in converting an image into size and shape information. more
Gel Permeation Chromatography (GPC), also known as Size Exclusion Chromatography (SEC), is a very popular analytical toll for characterizing natural and synthetic polymers. The introduction of the first differential Viscometer (Viscotek Model H100) back in the early 1980's provided a quantu ... more
Squeeze flow rheometry involves compressing a material between two parallel plates in order to determine its rheological properties. Squeeze flow measurements can be made with a rotational rheometer having suitable axial capabilities (normal force and gap control) such as Kinexus and can of ... more