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Rheological study on lower critical solution temperature behavior of organo-soluble cyano-substituted p-aramid in isotropic phase

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Abstract

Poly(2-cyano-p-phenylene terephthalamide) (CY-PPTA) has garnered significant interest as a promising precursor for super p-aramid fibers because of its organosolubility in N,N-dimethyl acetamide/lithium chloride (DMAc/LiCl) while conserving the superior properties of the resultant fibers. However, CY-PPTA has been reported to exhibit abnormal phase behavior owing to the strong dipole–dipole interactions induced by the cyano groups. Herein, we rheologically study the isotropic phases of CY-PPTA/DMAc solutions with respect to the concentration and temperature and compare them with those of CY-PPTA/sulfuric acid (H2SO4) solutions. In the isotropic region, the CY-PPTA solutions yield a higher power-law exponent of the dynamic viscosity (η') versus concentration of 6.0 (ηʹ ~ c6.0) in the DMAc system than that in H2SO4 (ηʹ ~ c3.2). Moreover, the CY-PPTA/DMAc solutions exhibit a lower critical solution temperature (LCST) behavior with increasing temperature, in contrast with the upper critical solution temperature in H2SO4. Consequently, the viscosity and exponent of the CY-PPTA/DMAc solutions increase at elevated temperatures. As shown by the Cole–Cole plot, the heterogeneity in the DMAc system becomes worse. The LCST of the CY-PPTA solution is ascribed to the intermolecular interactions between the highly polar cyano groups, which are negligible in H2SO4.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This research was supported by a Research Grant of Pukyong National University (2023 year; C-D-2023-1624-0001).

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Author notes

  1. Hyo Jeong Kim, Thanakorn Yeamsuksawat and Dae Eon Jung have equally contributed to the work.

Authors and Affiliations

  1. Department of Polymer Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan, 48513, Republic of Korea

    Hyo Jeong Kim, Yeamsuksawat Thanakorn & Youngho Eom

  2. Department of Polymer Science and Engineering, University of Massachusetts, 120 Governors Drive, Amherst, MA, 01003, USA

    Dae Eon Jung

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  1. Hyo Jeong Kim
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  2. Yeamsuksawat Thanakorn
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  3. Dae Eon Jung
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Correspondence to Youngho Eom.

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Kim, H.J., Thanakorn, Y., Jung, D.E. et al. Rheological study on lower critical solution temperature behavior of organo-soluble cyano-substituted p-aramid in isotropic phase. Korea-Aust. Rheol. J. (2024). https://doi.org/10.1007/s13367-024-00088-z

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  • DOI: https://doi.org/10.1007/s13367-024-00088-z

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