Structure characterization of high stretchtched polyethylene terephthalate using atomic force microscopy
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The microscopic structure of polymeric material has a big influence on its mechanical properties. An important characteristic variable is the glass transition temperature. Orientation and crystallinity of the polymer chains are influenced by temperature changes. For the characterization of such inner structure changes atomic force microscopy (AFM) is a proper tool.
The focus of this investigation is on structures of high-stretched PET samples. After microtome cutting, the polished specimen surface is examined with AFM. The structure development is investigated after various temperature treatments. Due to different temperatures and stretching, varying fibril structures are formed.
Results and Discussion
The examination near to the surface shows narrower fibril layers compared to fibril layers found in a deeper measurement position. The different fibril layer distances are formed because of the various temperature zones in the bulk sample. The edge areas are cooled down much faster than the specimen center.