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This study explores using microalgae like Spirulina in polyethylene biocomposites to reduce plastic waste. Unwashed microalgae enhanced composite properties and improved resistance to thermo-oxidation.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biotechnology

Background:

  • Excessive plastic use causes environmental damage.
  • Biocomposites offer an eco-friendly alternative.
  • Microalgae are a sustainable source for biocomposite production.

Purpose of the Study:

  • To evaluate Spirulina (washed and unwashed) as a filler in polyethylene (PE) biocomposites.
  • To assess the impact of biomass content on composite properties.
  • To investigate the potential for reducing virgin plastic use and improving material performance.

Main Methods:

  • Biocomposites were fabricated using rotomolding with varying Spirulina biomass percentages (up to 15%).
  • Mechanical, thermal, and water uptake properties were analyzed.
  • Thermo-oxidative resistance was assessed via oxidation induction time measurements.

Main Results:

  • Composites with up to 15% biomass were successfully produced, a high ratio for rotomolding.
  • Unwashed Spirulina at higher loadings yielded superior properties compared to washed biomass.
  • Biomass addition significantly increased the oxidation induction time, enhancing thermo-oxidative resistance.

Conclusions:

  • Microalgae, particularly unwashed Spirulina, can be effectively incorporated into polyethylene biocomposites.
  • This approach reduces reliance on virgin plastics and improves material durability.
  • Utilizing unwashed biomass offers economic and environmental advantages, including reduced water consumption and costs.