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Polyphenylene Sulfide-Based Compositions with Solid Fillers for Powder Injection Molding.

Dmitry V Dudka1, Azamat L Slonov2, Khasan V Musov2

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This study demonstrates Powder Injection Molding (PIM) feasibility for Polyphenylene Sulfide (PPS) using optimized Low-Density Polyethylene (LDPE) binders. Carbon fiber reinforcement significantly enhanced mechanical properties in the PIM-processed PPS components.

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polyphenylene sulfidepowder moldingsuspensionsvisco-elastic propertiesviscosity

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Area of Science:

  • Materials Science
  • Polymer Engineering
  • Manufacturing Technology

Background:

  • Powder Injection Molding (PIM) is established for metals and ceramics but underutilized for high-performance thermoplastics.
  • Polyphenylene Sulfide (PPS) is a promising linear aromatic polymer suitable for powder-based manufacturing.
  • Developing suitable PIM feedstocks is crucial for expanding PPS applications.

Purpose of the Study:

  • To investigate the feasibility of manufacturing Polyphenylene Sulfide (PPS) components using Powder Injection Molding (PIM).
  • To develop and optimize Polyethylene (PE)-based feedstocks incorporating PPS and various solid fillers.
  • To evaluate the impact of different fillers on the rheological and mechanical properties of PPS PIM feedstocks.

Main Methods:

  • Formulation of PE-based binders with varying ratios of Low-Density Polyethylene (LDPE) and paraffin.
  • Incorporation of Polyphenylene Sulfide (PPS) powder and solid fillers (chalk, talc, carbon fibers) into the binder system.
  • Rheological analysis to assess feedstock processability for complex geometries.
  • Optimization of sintering conditions to achieve desired mechanical properties.
  • Characterization of mechanical performance, including elastic modulus and flexural strength.

Main Results:

  • A modified LDPE/paraffin binder system (70:30 wt.%) enabled a significant increase in PPS loading to 50 wt.%, ensuring stable molding.
  • Rheological analysis confirmed the processability of the developed composite feedstocks for complex shapes.
  • Optimal sintering conditions were identified to meet mechanical property requirements.
  • Carbon fiber reinforcement resulted in a 33% increase in elastic modulus and a 20% increase in flexural strength.

Conclusions:

  • Powder Injection Molding (PIM) is a viable technology for manufacturing components from Polyphenylene Sulfide (PPS).
  • Optimized PE-based feedstocks with high PPS content are achievable, enabling stable molding processes.
  • Carbon fibers provide effective reinforcement, significantly enhancing the mechanical properties of PIM-processed PPS composites.