Characterization of polymers

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 molar mass, polydispersity and the viscosity of the polymer sample are determined. Here suitable sample preparation is important in order to dissolve the polymers. The degradation - the destruction of the characteristics of the material - has to be avoided though. An ideal solution for the sample preparation is the Variable Speed Rotor Mill PULVERISETTE 14 classic line. Here a final fineness of < 80 µm ís achieved. An embrittlement of the polymer with liquid nitrogen, or the grinding while adding dry ice avoid the degradation. The following graphics illustrate the analysis of PE (polyethylene) and PP (polypropylene):