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Keysight Technologies Statistical Variation and Strain-Rate Sensitivity of the Mechanical Properties of Individual PET Fibers Application Note Introduction crystalline phases [3]. The final part of the curve represents slippage between Poly(ethylene terephthalate), or microfibrils. It is important to note here PET (also known as polyester), is a that the changes in elastic properties thermoplastic polymer used extensively of a PET fiber during these different as synthetic fiber. PET fibers are popular deformation regimes were significant because of their improved wrinkle and have been measured previously resistance, durability and high color using continuous dynamic analysis retention [1, 2]. Most characteristic (CDA) [4]. physical properties of PET fibers are attributed to the presence of benzene During the deformation of the rings, which also lead to high stiffness amorphous regions, stress of the polymer chains [1]. concentration in the surface layer of the fiber results in surface cracks and The polymer chains in one individual crazing in the PET fibers (horizontal PET fiber can be distributed in arrows in Figure 1). The propagation crystalline, oriented semi-crystalline of one or few of these cracks through and non-crystalline (amorphous) the sample is a stochastic process regions [3]. A PET fiber consists of depending on the distribution of microfibrils aligned along the fiber axis. crystalline and amorphous regions in These microfibrils, in turn, consist of the core of the fiber. Hence, it is not crystalline and amorphous regions, only important to characterize the