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1 2024

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A preliminary assessment on the preparation of spirulina/PE blends by compression molding

Díaz Sara, Romero Francisco, Suárez Luis, Ortega Zaida

Composites Theory and Practice

2024

R. 24, nr 4

238--245

Substituting petrochemical plastics with biobased plastics from natural feedstock offers an environmentally friendly alternative to reduce the carbon footprint. Proteins are promising biopolymers that can be transformed into plastics and sourced from various types of biomass, such as microalgae. Microalgae, particularly spirulina, is considered an excellent renewable resource for bioplastic production due to its high protein content. This study focuses on the characterization of spirulina-polyethylene (PE) composites molded by compression molding technology. Both washed (for salt removal), and unwashed biomass were used in order to explore a potentially more sustainable and cost-effective option. Various loadings of both biomass types (5 % - 30 % by weight) were investigated, and the mechanical (tensile, flexural, and impact resistance) as well as thermal properties (thermogravimetric analysis and differential scanning calorimetry) of the resulting composites were determined. The mechanical properties remained nearly unchanged compared to neat PE when the biomass content was kept under 10 wt.% for both the washed and unwashed biomass. At higher biomass loadings, a reduction in mechanical per formance was observed; however, the molded parts maintained good aesthetics and acceptable properties. Despite the pre dictable adverse changes in thermal behavior, the processability of the materials was not affected. Differential scanning calorimetry indicated that total plasticization of the biomass protein was not achieved during the molding process. Additional ly, no significant differences were found between the washed and unwashed biomass, suggesting that using unwashed biomass could be more economically and environmentally beneficial.