Rheological Properties and Melt Spinning Application of Controlled-Rheology Polypropylenes via Pilot-Scale Reactive Extrusion

Ho Suk Ji, Geunyeop Park, Hyun Wook Jung

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Based on pilot-scale twin-screw reactive extrusion, the structural and rheological properties of controlled-rheology polypropylenes (CR-PPs) are investigated, where the effects of peroxide content and extrusion conditions such as screw configuration, extrusion temperature, and screw speed are prioritized. The active chain cleavage reaction by a small peroxide content of less than 600 ppm inside the extruder gradually increases the melt index and narrows the molecular weight distribution of CR-PPs, thereby affording favorable properties that are applicable to the fiber spinning process. The mechanical properties of CR-PPs are slightly degraded owing to the generation of unsaturated chain ends during the reactive extrusion, which suppresses crystal growth. Under all extrusion conditions, the chain scission and thermal degradation of polypropylene samples occur actively in the harsh twin-screw extruder compared with those in the mild twin-screw extruder. Finally, it is confirmed that CR-PPs can be suitably applied to the melt-spinning process for staple fiber production, thereby guaranteeing a more stable spinning process window against draw resonance instability.

Original languageEnglish
Article number3226
Issue number15
Publication statusPublished - 2022 Aug

Bibliographical note

Funding Information:
This research was supported by the Ministry of Trade, Industry, and Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (Grant No. 20004044). The authors express their gratitude to the S-Oil Technical Service & Development Center for their research collaboration and financial support.

Publisher Copyright:
© 2022 by the authors.


  • controlled-rheology polypropylene
  • melt spinning process
  • peroxide-initiated degradation
  • pilot-scale reactive extrusion
  • rheological properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics


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