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Abstract
The tensile loading – induced necking in notched specimens of amorphous poly(ethylene naphthalate) (PEN) was studied by conventional (DSC) and alternating differential scanning calorimetry (ADSC) and microhardness measurements. It was shown that in this PEN, similarly to amorphous copolyesters, necking occurred via cold drawing and not via true plastic deformation. The variation of the microhardness along the height and width of the necked region of the specimen reflects the specific orientation of the material during tensile loading. It was observed that the tensile loading provokes a drastic (jump-like) orientation of the macromolecules in draw direction, which even increases in the vicinity of the tip of the necked zone.