Yıldırım, KenanUlcay, Yusuf2021-03-202021-03-2020141618-7229http://doi.org/10.1515/epoly-2013-0068https://hdl.handle.net/20.500.12885/1216In this study, macromolecular arrangements in fibers were investigated and a novel approach based on model development for partially oriented (POY) polyethylene terephthalate (PET) yarn morphology was proposed. Differential scanning calorimeter (DSC) analysis, Fourier transform infrared (FT-IR) analysis, boiling water shrinkage and tensile tests were performed through the study. DSC thermogram, FT-IR spectra, stress-strain curve, the change in the boiling water shrinkage properties and data from the literature were used to develop the model for POY PET fiber morphology. In order to make a comparison, textured PET yarn morphology was also investigated. The neck formations during tensile tests, cold crystallization on the DSC thermogram, peak formation on the FT-IR spectrum of the POY PET yarn after texturizing and shrinkage test at 971 and 845 cm(-1) and shrinkage phenomenon have been explained by this model.eninfo:eu-repo/semantics/closedAccessmodel for POY fiber structuremorphologyPET yarnstress-strain curvethermal behaviorArticle10.1515/epoly-2013-0068142WOS:000333303000004Q4Q2