Biocomposites Based on Polyamide 11/Diatoms with Different Sized Frustules.

Area of Science:

• Materials Science
• Polymer Science
• Biocomposites

Background:

• Polyamide 11 (PA11) is a naturally sourced thermoplastic polymer.
• Diatomaceous earth is a natural filler with potential for polymer modification.
• Controlling filler particle size is crucial for optimizing biocomposite properties.

Purpose of the Study:

• To investigate the effect of fractionated amorphous diatomite on the mechanical properties of polyamide 11 biocomposites.
• To develop an industrially scalable method for producing tailored biocomposite materials.
• To analyze filler dispersion, particle size, and thermal properties.

Main Methods:

• Fractionation of amorphous diatomite by sedimentation to control particle size distribution.
• Preparation of biocomposites with varying filler content (2.5-20%).
• Mechanical testing (tensile, flexural, impact strength), particle size analysis (DLS), SEM for dispersion, DSC, and DMA for thermal analysis.

Main Results:

• Biocomposites with diatomaceous earth exhibited enhanced mechanical strength compared to pure PA11, particularly at 10% and 20% filler content.
• Tensile strength increased slightly, while flexural strength and modulus showed significant improvements (up to 63% and 54%, respectively).
• The sedimentation process enabled control over particle size distribution and filler dispersion.

Conclusions:

• Fractionated diatomaceous earth effectively reinforces polyamide 11 biocomposites.
• The proposed sedimentation method is simple, scalable for industrial production, and allows tuning of biocomposite properties.
• This approach offers a sustainable route to high-performance biocomposites from natural resources.