Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: New Instruments and Methods

CPP 28.3: Vortrag

Dienstag, 17. März 2015, 14:30–14:45, C 264

Non-destructive methods to determine the degree of crosslinking in polymeric materials — Gabriele Eder and •Volker Uhl — Austrian Research Institute for Chemistry and Technology (OFI), Vienna, Austria

The degree of crosslinking of many polymeric materials has a high impact on some technically important physical properties like hardness, elasticity, ductility or solubility. The main task of the work presented is to show that several quick and non-destructive characterization methods suited to determine the degree of crosslinking of polymeric component parts can be directly used to derive technically relevant physical or mechanical parameters. This can be achieved when a direct correlation between the measured and the physical properties of interest exist. As example, two series of variably cross-linked HDPE components were chosen, a material widely used for tubings and pipes, and investigated with various non-destructive methods. NIR-spectroscopy, confocal Raman spectroscopy and scanning acoustic microscopy proved to yield measured quantities directly correlated to the dose of irradiation used to crosslink the polymer. The results of these methods were validated against crosslinking data determined with conventional chemical analysis based on the solubility of the polymer. Furthermore, the degree of crosslinking was put into relation to characteristic mechanical parameters like Young's modulus and tensile strength, which were determined by mechanical testing.