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Related Concept Videos

Plasticizers01:31

Plasticizers

75
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
75

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Mouldable Conductive Plastic with Optimised Mechanical Properties.

Arfat Anis1, Abdullah Alhamidi1, Zahir Bashir2

  • 1SABIC Polymer Research Center (SPRC), Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia.

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|February 10, 2024
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Summary

This study developed a conductive plastic using carbon fibers in a PBT/rPET blend, achieving electromagnetic interference shielding and improved mechanical properties. The formulation offers a viable solution for high-performance conductive materials.

Keywords:
carbon fibreconductive plasticmechanical propertiespolymer blendrecycled PETreinforced polymer composite

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Area of Science:

  • Materials Science and Engineering
  • Polymer Science
  • Nanotechnology

Background:

  • Achieving electrical conductivity in plastics for applications like electrostatic charge dissipation and electromagnetic interference (EMI) shielding often compromises mechanical properties.
  • Traditional conductive fillers like carbon black and CNTs can decrease tensile strength, elongation, and impact resistance.
  • There is a need for conductive plastic formulations that maintain or enhance mechanical integrity alongside electrical performance.

Purpose of the Study:

  • To develop an injection mouldable conductive plastic formulation with EMI shielding capabilities.
  • To achieve good mechanical properties, including stiffness, strength, and impact resistance, in the conductive plastic.
  • To investigate the use of short carbon fibers as a conductive filler in a PBT/rPET matrix, enhanced with SEBS rubber.

Main Methods:

  • Formulation of a plastic matrix using a 50/50 blend of PBT and recycled PET (rPET).
  • Incorporation of short carbon fibers (CF) as the conductive filler.
  • Addition of styrene-ethylene-butadiene-styrene (SEBS) rubber as a toughening agent to enhance impact resistance.
  • Evaluation of mechanical properties (modulus, strength, impact resistance) and conductivity.
  • Microscopic analysis (Scanning Electron Microscopy) to assess filler-matrix bonding.

Main Results:

  • The PBT/rPET blend exhibited low initial impact resistance, which was improved by SEBS, though with a reduction in modulus and strength.
  • Short carbon fibers successfully restored and surpassed the original modulus and strength of the PBT/rPET matrix while imparting conductivity.
  • The formulation achieved conductivity in the EMI shielding range with good bonding between carbon fibers and the PBT/rPET matrix.
  • The final material demonstrated enhanced modulus, strength, and impact resistance compared to the base PBT/rPET.

Conclusions:

  • An injection mouldable conductive plastic formulation with high conductivity and improved mechanical properties (modulus, strength, impact resistance) was successfully developed.
  • Short carbon fibers are an effective conductive filler for PBT/rPET blends, offering a balance of performance and cost-effectiveness.
  • The developed material presents a viable solution for applications requiring both electrical conductivity and robust mechanical performance.