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Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

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Biocomposites Based on Biopolyamide with Reduced Water Absorption and Increased Fatigue Strength.

Patrycja Bazan1, Elisabeth Egholm Jacobsen2, Anna Olsen3

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Microsilica enhances biopolyamide composites, improving fatigue strength by up to 15% and reducing water absorption. This modification boosts mechanical properties and durability for advanced material applications.

Keywords:
fatigue strengthhybrid polymer compositesmicrosilicareinforcing fiberswater absorption

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Area of Science:

  • Materials Science
  • Polymer Science

Background:

  • Biopolyamide composites are susceptible to water absorption, which can degrade mechanical properties.
  • Microsilica is a potential additive for enhancing polymer matrix composites.

Purpose of the Study:

  • To investigate the effect of microsilica on the properties of biopolyamide composites.
  • To evaluate the influence of microsilica on water absorption and mechanical performance, including fatigue strength.

Main Methods:

  • Biopolyamide matrix composites were modified with varying concentrations of microsilica (0.5-2%).
  • Hybrid composites with aramid, basalt, and carbon fibers, plus 2% microsilica, were fabricated.
  • Water absorption, diffusion velocity, mechanical properties, microstructure, and accelerated fatigue tests were performed.

Main Results:

  • Microsilica incorporation improved fatigue strength by approximately 15% (base), 5% (aramid), and 10-15% (basalt, carbon).
  • Microsilica significantly reduced water absorption in the polymer composites.
  • Enhanced mechanical properties and fatigue resistance were observed with microsilica addition.

Conclusions:

  • Microsilica is an effective additive for enhancing the fatigue strength and mechanical properties of biopolyamide composites.
  • Reduced water absorption due to microsilica can improve composite durability in humid conditions.
  • The study highlights the potential of microsilica for developing more robust and long-lasting polymer composites.