Tensile Properties-Microstructure Correlations in the Hot-Drawn Nylon 6 Fiber

Semnani Rahbar, Ruhollah; Tavanaie, Mohammad Ali; Mohaddes Mojtahedi, Mohammad Reza

Tensile Properties-Microstructure Correlations in the Hot-Drawn Nylon 6 Fiber

Document Type : Research/ Original/ Regular Article

Authors

¹ Department of Textile and Leather, Faculty of Chemical and Petrochemical, Standard Research Institute (SRI)

² Department of Textile Engineering, Faculty of Engineering, University of Yazd

³ Department of Textile Engineering, Amirkabir University of Technology

Abstract

In the present work, nylon 6 fibers were hot-drawn with different number of drawing steps with a fixed total draw ratio of 4.63. FTIR spectroscopy, wide-angle x-ray diffraction, differential scanning calorimetry and birefringence measurements were used to explain the relationship between structure and tensile properties of the drawn fibers. The results show that gamma crystalline phase converts to alpha crystalline phase upon the drawing process. For three-stage drawn fibers, a higher initial modulus is achieved as compared to single and two-stage drawn fibers. The tensile properties (e.g. initial modulus) and shrinkage behavior of three-stage drawn fibers cannot be simply explained only with the crystalline structure and orientation. For understanding the relation, the interfibrillar taut-tie molecules fraction should be considered.

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