Abstract
Polyacrylonitrile (PAN) fibers are typically used as precursor fibers for carbon fiber production, produced through wet-spinning processes. The drawing process of the spun fiber can be classified into dry and wet drawing processes. It is known that the drawing stability and stretching ratio differ depending on the drawing process; however, the elementary characteristics are approximately similar. In this study, the mechanical properties of PAN fibers have been examined based on these two drawing processes with the differences analyzed through the analysis of microstructures. Further, to examine the composition of the fiber, element analysis has been conducted, and thereafter, the microstructure of the fiber is examined through X-ray diffraction analysis. Finally, the characteristics of PAN fibers and its mechanical properties has been examined according to each drawing condition. There are differences in moisture content and microstructure according to the drawing process, and it affects the tensile behavior. The results obtained could have potential implications if the processes are combined, as it could result in a design for a stable and highly efficient drawing process.
Highlights
Polyacrylonitrile (PAN) fibers are typically used as a precursor of carbon fibers, with more than 90% of the total carbon fiber produced being based on them [1]
The PAN-based precursor fibers are primarily manufactured by wet spinning process, including dry-jet wet spinning, and is the most researched among all carbon fiber precursors, with the aim to improve the physical properties because the mechanical properties of precursors have a significant influence on the mechanical properties of carbon fibers [4]
The microstructure changes of spun fibers were examined based on their drawing process using synthesized PAN copolymers
Summary
Polyacrylonitrile (PAN) fibers are typically used as a precursor of carbon fibers, with more than 90% of the total carbon fiber produced being based on them [1]. The PAN-based precursor fibers are primarily manufactured by wet spinning process, including dry-jet wet spinning, and is the most researched among all carbon fiber precursors, with the aim to improve the physical properties because the mechanical properties of precursors have a significant influence on the mechanical properties of carbon fibers [4]. For the improvement of mechanical properties and manufacturing process, many studies have been conducted to improve physical properties and process stability by controlling the copolymers and molecular weight of PAN [5]. MA and IA have been used occasionally because of their high efficiency through various combinations and polymerization [7] They can improve the stability of the post-spinning process efficiently with a content of less than 2% [8]. A study on the manufacturing process of high molecular weight fibers has been conducted using dry-jet wet spinning process [13]
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