High-Modulus Low-Cost Carbon Fibers from Polyethylene Enabled by Boron Catalyzed Graphitization

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Current polyacrylonitrile-based carbon fibers (CFs) are expensive, limiting market growth.
• Polyethylene is a low-cost, high-carbon precursor for industrial-grade CFs.
• Sulfonated polyethylene (SPE)-derived CFs have not met the required 200 GPa tensile modulus.

Purpose of the Study:

• To develop a cost-effective method for producing high-modulus carbon fibers.
• To investigate the catalytic effect of boron on polyethylene graphitization.
• To achieve industrial applicability thresholds for CFs derived from polyethylene.

Main Methods:

• Development of a boron-catalyzed graphitization process for sulfonated polyethylene (SPE).
• Carbonization of SPE at temperatures up to 2400 °C.
• Characterization of CF properties using Wide Angle X-ray Diffraction (WAXRD).

Main Results:

• Boron addition catalyzed graphitization, initiating around 1200 °C (a 400 °C reduction).
• Achieved >400 GPa tensile modulus at 2400 °C.
• Attained 200 GPa tensile modulus and 2.4 GPa tensile strength at 1800 °C.

Conclusions:

• Boron catalysis significantly enhances the graphitization of SPE-derived carbon fibers.
• The developed process yields high-performance CFs meeting industrial standards at practical temperatures.
• This offers a viable, low-cost alternative to traditional carbon fibers for various applications.