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Mesopores variation in polyacrylonitrile fibers during dry-jet wet spinning process

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Abstract

The mesopore structures in polyacrylonitrile (PAN) fibers during dry-jet wet spinning process were investigated by high-resolution transmission electron microscopy (HRTEM) and image analysis utilizing the ultrathin section technique. The morphologies and dimension distribution of the mesopores in the surface and core regions of the nascent fibers and PAN fibers are presented. All fibers exhibited lamellar-like structures perpendicular to the fiber axis and the mesopores were distributed between the lamellae. For nascent fibers, the size and volume of the mesopores increased with increasing air gap and decreased with increasing drawing ratio. In addition, the widths of the mesopores were larger than their lengths. Consequently, the size and content of the mesopores in nascent fibers could be adjusted by controlling coagulation conditions. During the post-spinning process, the size and volume of the mesopores in PAN fibers decreased efficiently by hot drawing in a hot water washing bath, in hot steam chambers or on hot rollers. Moreover, the lengths of the mesopores were larger than their widths. In all fiber samples, the number and size of the mesopores in the core region were larger than those in the surface region. In addition, the mechanical properties of fibers were correlated with dimension of the mesopores. Their tensile strength increased with decreasing mesopore widths and lengths.

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Acknowledgements

This work was supported by the National Natural Science Foundation, China (Grant nos. 51773110 and 51573087) and the Natural Science Foundation of Shandong Province, China (Grant nos. ZR2016EMM16 and ZR2018BEM036).

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Authors and Affiliations

  1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, China

    Quan Gao, Chengguo Wang, Meiling Chen, Shengyao Zhao, Wenli Wang & Jianjie Qin

  2. Carbon Fiber Engineering Research Center, School of Material Science and Engineering, Shandong University, Jinan, 250061, China

    Quan Gao, Chengguo Wang, Meiling Chen, Shengyao Zhao, Wenli Wang & Jianjie Qin

  3. School of Material Science and Engineering, Shandong Jianzhu University, Jinan, 250101, China

    Min Jing

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  1. Quan Gao
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  3. Chengguo Wang
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  4. Meiling Chen
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Correspondence to Chengguo Wang.

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Gao, Q., Jing, M., Wang, C. et al. Mesopores variation in polyacrylonitrile fibers during dry-jet wet spinning process. Iran Polym J 28, 259–269 (2019). https://doi.org/10.1007/s13726-019-00699-2

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  • DOI: https://doi.org/10.1007/s13726-019-00699-2

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