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Carbonized Hemp Fiber for Use in Composites
Sodiq B Yusuf1, Michael R Maughan2, Armando G McDonald1
1Forest and Sustainable Products Program, Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID 83844, USA.
Materials (Basel, Switzerland)
|June 13, 2025
Summary
Carbonized hemp fiber (CHF) enhances phenol resorcinol formaldehyde (PRF) composites, improving thermal stability and hydrophobicity. While flexural strength was lower than hemp fiber composites, extruded CHF composites demonstrated superior mechanical properties.
Area of Science:
- Materials Science
- Polymer Science
- Composite Materials
Background:
- Phenol resorcinol formaldehyde (PRF) based composites are widely used.
- Enhancing the properties of PRF composites is an ongoing area of research.
- Natural fibers offer a sustainable alternative for composite reinforcement.
Purpose of the Study:
- To investigate carbonized hemp fiber (CHF) as a reinforcement for PRF composites.
- To compare the performance of CHF with hemp fiber (HF) and wood fiber (WF) in PRF composites.
- To evaluate the extrudability and mechanical properties of CHF-PRF composites.
Main Methods:
- Hemp fiber was carbonized at 1000 °C under N2 atmosphere.
- Compression molding was used to prepare composites with varying fiber loadings (0-50%).
- Dynamic rheology, thermogravimetric analysis (TGA), and mechanical testing were performed.
Main Results:
- CHF composites exhibited superior thermal stability and hydrophobicity compared to HF and WF composites.
- Uncured composites showed pseudoplastic behavior, indicating potential for extrusion.
- Extruded CHF composites demonstrated better mechanical properties than extruded HF and WF composites.
Conclusions:
- Carbonization enhances the thermal stability and hydrophobicity of hemp fibers in PRF composites.
- CHF-PRF composites show promise as extrudable materials with improved durability.
- CHF is a viable reinforcement for developing high-performance PRF composites.
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