Abstract
In this work, two sets of high performance polyimide (PI) fibers fabricated by a more environmentally-friendly and highly efficient “reaction-spinning” method were firstly reported. The relationship between the spinning rate, chemical structure and the imidization degree of the PI precursor fibers were investigated, and the results indicated a moderate low spinning speed and relatively flexible molecular chains are both favorable for the partial imidization reaction in the spinning process. 2D WAXD results demonstrate that the rigid PDA-based PI fibers possess a higher alignment of polymer chains along the fiber axis during the spinning compared to the flexible ODA-based PIs, resulting in enhanced mechanical properties, with the tensile strength of 1.2-2.8 GPa and modulus of 53.6-111.2 GPa, respectively. Meanwhile, ODA sets of PI fibers exhibit a higher loop strength and knot strength than the commercial Aramid and PBO fibers. The process used in this study has a significant potential for realizing industrial level production of high strength and high modulus PI fibers.
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Supporting Information: Experimental procedure for the preparation of ODA- and PDA-sets PI fibers, their characteristic information and the simulation of chemical structures of BPDA-PDA and BPDA-ODA dimers. The materials are available via the Internet at http://www.springer.com/13233.
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Acknowledgments: This work was supported by the Program of Shanghai Academic Research Leader (18XD1400100), the National Key Research and Development Program of China (No. 2017YFB0308304), Special Fund of China Postdoctoral Science Foundation (2018T110323) and National Natural Science Foundation of China (No. 21774019).
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Li, Z., Dong, J., Huang, J. et al. Structure and Properties of Aromatic Polyimide Fibers Fabricated by a Novel “Reaction-Spinning” Method. Macromol. Res. 28, 1–4 (2020). https://doi.org/10.1007/s13233-020-8014-3
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DOI: https://doi.org/10.1007/s13233-020-8014-3