Development of Sustainable Red Algae-Sisal Fiber Composite Films via Doctor Blading.

Matthew Richards, Joshua Baird, Noah Serda, Vuong Do, Yanika Schneider

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Article in Polymers, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

5 authors.

Matthew RichardsDepartment of Chemical and Materials Engineering, San Jose State University, One Washington Square, San Jose, CA 95192, USA.

Joshua BairdDepartment of Chemical and Materials Engineering, San Jose State University, One Washington Square, San Jose, CA 95192, USA.

Noah SerdaDepartment of Chemical and Materials Engineering, San Jose State University, One Washington Square, San Jose, CA 95192, USA.

Vuong DoDepartment of Chemical and Materials Engineering, San Jose State University, One Washington Square, San Jose, CA 95192, USA.

Yanika SchneiderDepartment of Chemical and Materials Engineering, San Jose State University, One Washington Square, San Jose, CA 95192, USA.ORCID 0000-0001-6806-3049

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

This study investigated the properties of red algae (RA) biocomposite films reinforced with natural sisal fibers and plasticized with glycerol. The polymer was extracted from locally sourced red seaweed and combined sisal fibers at varying fiber loadings (0-45 wt%) using the doctor blading technique. Composite films were analyzed using a variety of methods to evaluate the chemical composition, thermal behavior and mechanical performance. Infrared spectroscopy confirmed the presence of kappa-carrageenan as the dominant polysaccharide in the RA matrix, whereas elemental analysis verified the dilution of sulfur content and enrichment of carbon with increasing fiber incorporation. Thermal stability increased with fiber loading, peaking at 30 wt% sisal fiber before decreasing slightly at 45 wt% due to poor fiber dispersion. Mechanical testing demonstrated an optimal balance between strength and flexibility at 30 wt% sisal fiber, with a 37% increase in strength compared to the pure RA film. Overall, the findings demonstrate that sisal fiber reinforcement enhances the structural integrity and stability of RA-based films, supporting their potential as biodegradable alternatives to petroleum-based plastics.

Indexed as

biocompositedoctor bladingkappa-carrageenanmechanical analysisred algae polymersisal fibersthermal analysis

Identifiers

PMID41682131

DOI10.3390/polym18030424

PMCPMC12899586

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