Carbon fiber composite material and method for producing same

Fluorinated carbon fibers enhance interfacial adhesion strength by aligning surface free energy with polymer resins, improving mechanical properties and recyclability in carbon fiber composite materials.

WO2026116046A1PCT designated stage Publication Date: 2026-06-04TOHOKU UNIV +2
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TOHOKU UNIV
Filing Date
2025-11-06
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Carbon fiber composite materials using thermoplastic resins suffer from poor mechanical properties due to low interfacial adhesion strength between carbon fiber reinforcement and the resin, leading to issues like interfacial delamination and slippage, which are exacerbated when recycled.

Method used

The use of fluorinated carbon fibers, where fluorine groups are directly bonded to the carbon fiber surface to align the surface free energy with that of the polymer resin, enhancing interfacial adhesion strength.

Benefits of technology

This approach improves the mechanical properties of carbon fiber composite materials, including interfacial shear strength, while maintaining recyclability when using thermoplastic resins and preserving mechanical strength when using thermosetting resins.

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Abstract

The present invention provides: a carbon fiber composite material having high interfacial adhesive strength between a carbon fiber reinforcing material and a polymer resin and thereby excellent in dynamic characteristics (or mechanical characteristics) such as interfacial shear characteristics; and a method for producing the same. A carbon fiber composite material according to the present invention contains a carbon fiber reinforcing material and a polymer resin bonded to the carbon fiber reinforcing material, characterized in that the carbon fiber reinforcing material contains fluorinated carbon fibers. This brings the surface free energies of the fluorinated carbon fibers and the polymer resin closer together, thus increasing the bonding strength at the interface between the fluorinated carbon fibers and the polymer resin, and improving dynamic characteristics such as interfacial shear characteristics.
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