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Rheology Modulation and Melt Strength Enhancement Enable Continuous Melt Spinning of PEK-C Fibers.

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Title: Rheology Modulation and Melt Strength Enhancement Enable Continuous Melt Spinning of PEK-C Fibers.
Authors: Mao, Yi1 (AUTHOR), Ke, Zhao1,2 (AUTHOR), Ma, Ying2,3 (AUTHOR), Li, Hui1 (AUTHOR) lihui@dhu.edu.cn, Hu, Zexu2,3 (AUTHOR) huzexu@dhu.edu.cn
Source: Polymers (20734360). Sep2026, Vol. 18 Issue 17, p2106. 21p.
Subjects: Melt spinning, Continuous processing, Molecular weights, Synthetic fibers, Polymerization, Fibers
Abstract: Phenolphthalein poly (aryl ether ketone) (PEK-C) is highly compatible with epoxy resin, which is applied in epoxy resin-based composites to improve their strength. Solution spinning and electrospinning techniques are often used to produce PEK-C fibers, but these techniques pollute the environment and are not productive. To address the above challenges, melt spinning may be employed, but due to the high degree of molecular chain entanglement and poor melt fluidity of PEK-C, melt spinning remains difficult. Herein, this study presents the continuous melt spinning of PEK-C fibers through rheology modulation and melt strength enhancement. A series of PEK-C samples with different molecular weights were prepared by adjusting the molar ratio of monomers. The influence of molecular weights on rheological properties was investigated via capillary rheology tests. PEK-C with molecular weight (2.01 × 104 g/mol) was chosen, and the optimal spinning temperature was determined to be 370 °C. The as-polymerized PEK-C powder was compounded into pellets; subsequently, the PEK-C pellets with enhanced melt strength were continuously processed into fiber through melt spinning. The obtained PEK-C fibers possess high tensile strength (0.56 cN/dtex) and breaking strength (1.06 cN/dtex). The mechanical properties and molecular chain orientation of PEK-C fibers were also optimized by spinning process parameters. This work presents continuous melt spinning of PEK-C fibers via rheology modulation and melt strength enhancement, which resolve the environmental and low productivity issues. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Rheology Modulation and Melt Strength Enhancement Enable Continuous Melt Spinning of PEK-C Fibers.
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Sep2026, Vol. 18 Issue 17, p2106. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Melt+spinning%22">Melt spinning</searchLink><br /><searchLink fieldCode="DE" term="%22Continuous+processing%22">Continuous processing</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+weights%22">Molecular weights</searchLink><br /><searchLink fieldCode="DE" term="%22Synthetic+fibers%22">Synthetic fibers</searchLink><br /><searchLink fieldCode="DE" term="%22Polymerization%22">Polymerization</searchLink><br /><searchLink fieldCode="DE" term="%22Fibers%22">Fibers</searchLink>
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  Label: Abstract
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  Data: Phenolphthalein poly (aryl ether ketone) (PEK-C) is highly compatible with epoxy resin, which is applied in epoxy resin-based composites to improve their strength. Solution spinning and electrospinning techniques are often used to produce PEK-C fibers, but these techniques pollute the environment and are not productive. To address the above challenges, melt spinning may be employed, but due to the high degree of molecular chain entanglement and poor melt fluidity of PEK-C, melt spinning remains difficult. Herein, this study presents the continuous melt spinning of PEK-C fibers through rheology modulation and melt strength enhancement. A series of PEK-C samples with different molecular weights were prepared by adjusting the molar ratio of monomers. The influence of molecular weights on rheological properties was investigated via capillary rheology tests. PEK-C with molecular weight (2.01 × 104 g/mol) was chosen, and the optimal spinning temperature was determined to be 370 °C. The as-polymerized PEK-C powder was compounded into pellets; subsequently, the PEK-C pellets with enhanced melt strength were continuously processed into fiber through melt spinning. The obtained PEK-C fibers possess high tensile strength (0.56 cN/dtex) and breaking strength (1.06 cN/dtex). The mechanical properties and molecular chain orientation of PEK-C fibers were also optimized by spinning process parameters. This work presents continuous melt spinning of PEK-C fibers via rheology modulation and melt strength enhancement, which resolve the environmental and low productivity issues. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.3390/polym18172106
    Languages:
      – Code: eng
        Text: English
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        PageCount: 21
        StartPage: 2106
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      – SubjectFull: Melt spinning
        Type: general
      – SubjectFull: Continuous processing
        Type: general
      – SubjectFull: Molecular weights
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      – SubjectFull: Synthetic fibers
        Type: general
      – SubjectFull: Polymerization
        Type: general
      – SubjectFull: Fibers
        Type: general
    Titles:
      – TitleFull: Rheology Modulation and Melt Strength Enhancement Enable Continuous Melt Spinning of PEK-C Fibers.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Mao, Yi
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            NameFull: Ke, Zhao
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            NameFull: Ma, Ying
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            NameFull: Li, Hui
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            NameFull: Hu, Zexu
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          Dates:
            – D: 01
              M: 09
              Text: Sep2026
              Type: published
              Y: 2026
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