Characterization of Polymers

The analysis of polymers is executed with the aid of gel permeability chromatography. This process is a kind of liquid chromatography similar to the HPLC. Due to the size of the molecules the separation takes place in the solution. Depending on the detector, the average value of the mol mass, polydispersity and the viscosity of the polymer sample are determined. Suitable sample preparation is important in order to dissolve the polymers. The degradation – the destruction of the characteristics of the material – however, must be avoided. A solution for the sample preparation is the Variable Speed Rotor Mill Pulverisette 14, achieving a fineness of < 80 µm. An embrittlement of the polymere with liquid ntirogen or the grinding while adding dry ice avoids degradation.

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