Abstract
Polyester fibers take a leading position among all chemical fibers. The unique properties of these fibers are due to the presence of aliphatic and aromatic parts in macromolecular chains and the regular molecular structure. Poly(ethylene terephthalate) (PET) is the predominant polyester used for fiber production, not only because of its good end-use properties and economy of production but in particular because of the ease of physical and chemical modification, suppressing negative and enhancing positive properties of PET. Despite the fact that PET and modified PET fibers were widely investigated, there are still no fully described phenomena of predicting the mechanical behavior and tensile failure based on the structure or manufacturing parameters. One of the main reasons is the complex character of changes during fiber manufacturing and modifications of structure during influence of stress field, temperature, time and environmental factors.
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