Fused filament fabrication of polyamide 6 nanographene composite for electrostatic discharge applications

Polyamide 6 nanographene composite is a composite material that combines polyamide 6 (PA6) with nanographene particles. PA6 is a commonly used engineering plastic known for its impressive mechanical properties, while nanographene particles consist of graphene flakes at the nanoscale. In this composite, the nanographene particles are uniformly dispersed throughout the PA6 matrix, resulting in enhanced properties across multiple dimensions compared to pure PA6. These enhancements include improved mechanical strength, thermal conductivity, electrical conductivity, and barrier properties against gas and water vapor permeation.

The polyamide 6 nanographene composite applications are diverse and span various industries. In the automotive sector, the composite can be used to produce engine covers, fuel rails, and air intake manifolds, benefitting from its enhanced mechanical properties. The composite’s improved barrier properties in the food packaging industry make it an ideal choice for creating packaging materials that offer better protection against gas and water vapor permeation. Moreover, the composite finds utility in producing electronic components like connectors and switches, capitalizing on its excellent electrical conductivity and mechanical strength. Additionally, the composite’s biocompatibility and strength open up possibilities for its use in medical implants and devices.

Using polymers in composite materials brings numerous advantages, including cost-effectiveness, lightweight nature, flexibility in manufacturing, and adjustability. Particularly in Fused Filament Fabrication 3D printing, engineering thermoplastics have gained popularity due to their ability to maintain malleability even at high temperatures. However, the limited availability of thermoplastic materials has led to the developing of specialized composite filaments. Nanomaterials such as carbon additives, including graphene, carbon nanotubes, and carbon blacks, have been introduced to polymers to create high-performance functional composites. These nanomaterials have unique mechanical, thermal, and electrical properties that make them suitable for various applications. Researchers have focused on reinforcing thermoplastic matrices with nanofillers to enhance their mechanical and electrical properties, thereby increasing the multifunctionality of the resulting nanocomposites. In addition, polyamides, such as polyamide 6, hold great potential for creating fully multifunctional nanocomposites, making them highly versatile for demanding applications.

In a recent study published in the Journal of Materials Science & Engineering B, researchers from Texas State University, led by Professor Jitendra Tate, developed a multifunctional polymer nanocomposite for electrostatic discharge applications using polyamide 6 and graphene nanoplatelets. The researchers leveraged the malleability of polyamide 6 at high temperatures, making it suitable for Fused Filament Fabrication. Due to their high aspect ratio, they incorporated graphene nanoplatelets as filler material, enabling an electrically conducting network within the nanocomposite. The resulting material composite demonstrated great potential for manufacturing static discharge products, which are critical in handling electronic components. These products prevent damage to electronic components, ensure worker safety, and maintain manufacturing efficiency.

To create the nanocomposite, the researchers used a co-rotating twin-screw extruder to blend different weight percentages of graphene nanoplatelets with polyamide 6, resulting in monofilaments suitable for Fused Filament Fabrication. They conducted extensive mechanical, thermal, and electrical property evaluations using various testing methods. Scanning electron microscopy was employed to investigate the morphology of the dispersed graphene nanoplatelets in the polyamide 6 matrix. Mechanical properties, including tensile and flexural properties, were assessed following ASTM standards. Thermal stability was analyzed using thermogravimetry and differential scanning calorimetry, while electrical testing involved measuring volume resistivity.

The study revealed that adding graphene nanoplatelets to polyamide 6 significantly improved the mechanical properties of the nanocomposites. With increasing graphene nanoplatelets content, the tensile and flexural properties exhibited incremental enhancements, with a substantial increase in tensile and flexural modulus at a 6 wt% addition. In addition, the nanocomposites demonstrated excellent thermal stability and increased crystallinity at this loading level. Additionally, incorporating 2 wt% graphene nanoplatelets reduced volume resistivity, indicating the potential for fabricating static discharge products.

In conclusion, polyamide 6 nanographene composite is a highly versatile material with remarkable mechanical, thermal, and electrical properties. Its wide range of applications across industries and its enhanced characteristics compared to pure polyamide 6 make it an appealing choice for various manufacturing needs. In addition, the development of multifunctional polymer nanocomposites, such as the one utilizing polyamide 6 and graphene nanoplatelets, opens up new possibilities for creating advanced materials with superior performance in specific applications.