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Effects of Processing Parameters on the Mechanical, Thermo-Mechanical and Creep-Recovery Properties of Unidirectional Carbon Fiber Reinforced Thermoplastic Polypropylene Composites.

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Title: Effects of Processing Parameters on the Mechanical, Thermo-Mechanical and Creep-Recovery Properties of Unidirectional Carbon Fiber Reinforced Thermoplastic Polypropylene Composites.
Authors: Dong, Shaoce1 (AUTHOR) scdong@hit.edu.cn, Xie, Siwei1,2 (AUTHOR), Zhou, Ping2,3 (AUTHOR), Zhang, Puxuan1,4 (AUTHOR), Zhang, Yutan1 (AUTHOR), Hong, Bin2,3,4 (AUTHOR), Xian, Guijun1,3 (AUTHOR), Li, Chenggao1,4 (AUTHOR)
Source: Polymers (20734360). Jun2026, Vol. 18 Issue 11, p1342. 21p.
Subjects: Carbon composites, Polypropylene, Flexural strength, Mechanical behavior of materials, Thermal properties, Strains & stresses (Mechanics)
Abstract: Processing parameters play a key role in the mechanical, thermo-mechanical and creep-recovery properties of unidirectional carbon fiber reinforced thermoplastic polypropylene (CF/PP) composites because of high matrix viscosity, which governs their impregnation and interfacial bonding. This study systematically investigates the effects of molding temperature (190~210 °C), pressure (1~3 MPa), and holding time (5~15 min) on its short beam strength (SBS), storage modulus, loss modulus, tan δ, creep strain, strain recovery, and crystallinity using a Taguchi experimental design. The results presented that processing parameters have a huge effect on CF/PP composites' SBS, and through the experimental design, the SBS could be improved by 68.1% (21.3~35.8 MPa). Holding time is the most influential parameter for SBS and damping performance, while temperature and pressure interact strongly, highlighting the importance of parameter synergy. There was a strong negative correlation between the crystallinity degree and the SBS of CF/PP composites, and a higher crystallinity degree means a sharper and higher melting peak. Creep-recovery tests reveal near-complete recovery (87~102%) at 30 °C, which decreases to 71~79% at 80 °C due to increased matrix mobility. Finally, it was confirmed that the relatively low SBS of CF/PP composites comes from the void and incomplete matrix impregnation of fibers. The above results advance the design of high-performance, sustainable thermoplastic composites for civil and structural engineering applications. [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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  Data: Effects of Processing Parameters on the Mechanical, Thermo-Mechanical and Creep-Recovery Properties of Unidirectional Carbon Fiber Reinforced Thermoplastic Polypropylene Composites.
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  Data: <searchLink fieldCode="AR" term="%22Dong%2C+Shaoce%22">Dong, Shaoce</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> scdong@hit.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Xie%2C+Siwei%22">Xie, Siwei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Ping%22">Zhou, Ping</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Puxuan%22">Zhang, Puxuan</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yutan%22">Zhang, Yutan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hong%2C+Bin%22">Hong, Bin</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xian%2C+Guijun%22">Xian, Guijun</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Chenggao%22">Li, Chenggao</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Jun2026, Vol. 18 Issue 11, p1342. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Carbon+composites%22">Carbon composites</searchLink><br /><searchLink fieldCode="DE" term="%22Polypropylene%22">Polypropylene</searchLink><br /><searchLink fieldCode="DE" term="%22Flexural+strength%22">Flexural strength</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+properties%22">Thermal properties</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Processing parameters play a key role in the mechanical, thermo-mechanical and creep-recovery properties of unidirectional carbon fiber reinforced thermoplastic polypropylene (CF/PP) composites because of high matrix viscosity, which governs their impregnation and interfacial bonding. This study systematically investigates the effects of molding temperature (190~210 °C), pressure (1~3 MPa), and holding time (5~15 min) on its short beam strength (SBS), storage modulus, loss modulus, tan δ, creep strain, strain recovery, and crystallinity using a Taguchi experimental design. The results presented that processing parameters have a huge effect on CF/PP composites' SBS, and through the experimental design, the SBS could be improved by 68.1% (21.3~35.8 MPa). Holding time is the most influential parameter for SBS and damping performance, while temperature and pressure interact strongly, highlighting the importance of parameter synergy. There was a strong negative correlation between the crystallinity degree and the SBS of CF/PP composites, and a higher crystallinity degree means a sharper and higher melting peak. Creep-recovery tests reveal near-complete recovery (87~102%) at 30 °C, which decreases to 71~79% at 80 °C due to increased matrix mobility. Finally, it was confirmed that the relatively low SBS of CF/PP composites comes from the void and incomplete matrix impregnation of fibers. The above results advance the design of high-performance, sustainable thermoplastic composites for civil and structural engineering applications. [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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        Value: 10.3390/polym18111342
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        Text: English
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        PageCount: 21
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      – SubjectFull: Carbon composites
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      – SubjectFull: Polypropylene
        Type: general
      – SubjectFull: Flexural strength
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      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Thermal properties
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      – SubjectFull: Strains & stresses (Mechanics)
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      – TitleFull: Effects of Processing Parameters on the Mechanical, Thermo-Mechanical and Creep-Recovery Properties of Unidirectional Carbon Fiber Reinforced Thermoplastic Polypropylene Composites.
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            NameFull: Dong, Shaoce
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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