Microstructure analysis of PET via Raman spectroscopy and x-ray diffraction
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Polyethylene terephthalate (PET) is a polymer applied in a broad field of applications requiring specific mechanical properties. For the tailoring of PET properties, its microstructure has to be controlled and characteristic parameters such as crystallinity and orientation of the polymer chains have to be investigated. In general, X-ray scattering is used, which has the disadvantage of recalculation data from an inverse room. In contrast, polarized Raman spectroscopy allows direct investigation of polymer micro-structure since for semi-crystalline polymers such as PET peaks can be assigned, which are only sensitive for chemical structure an do not change with polarization direction of incident light. Beside, also peaks can be found which change their intensity with polarization of the laser. These peaks can be used to determine the degree of crystallization (705 cm-1 and 998cm-1), as well as orientation of polymer chains (705 cm-1 and 1616 cm-1) Raman imaging allow the determine local crystallinity- and orientation distributions on different positions on the sample. The aim of this study is to find a correlation of micro-structure and mechanical properties using X-ray as well as Raman microscopy. Therefore the micro structure of an amorphous and an isotropic crystallized PET, as well as PET stretched to different strain rates will be investigated.