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Polyolefins: Determination of Molecular Weight and Branching Structure by GPC/SEC

16-06-2008

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), ...

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Dynamic Light Scattering - an Important Tool for Protein Crystallography and Nanotechnology

07-02-2007

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 crystallisation of proteins. DLS is also used in the ...

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On-line particle analysis in wet processes

02-02-2007

Fully automated particle size measurement technology integrated with existing plant control platforms for ease of use has the potential to deliver numerous benefits. At plants where a switch to on-line analysis has been made it is frequently easier or possible to:

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Particle shape - an important parameter in pharmaceutical manufacturing

23-01-2007

The advent of rapid and reliable measurement technologies, together with the FDA's PAT (Process Analytical Technologies) initiative, has increased the use of particle shape analysis within the pharmaceutical industry. Particle shape, like particle size which is routinely measured and controlled, ...

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Making the connection - particle size, size distribution and rheology

23-01-2007

A number of factors influence the rheology of a suspension, including particle size, particle size distribution, and the volume fraction of solids present. Here we examine the relationship between rheology and particle size parameters. Commonly used rheological terms are described and we present ...

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"Triple Detection" in Gel Permeation Chromatography

11-11-2005

Gel permeation chromatography (GPC) or also named size exclusion chromatography (SEC) is the most often used method for determining the molecular weight of natural and synthetic macromolecules. One specific strength of this method lies in the fact that by the separation process the whole ...

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