Melt-Spinnable Polyacrylonitrile-An Alternative Carbon Fiber Precursor

Area of Science:

• Materials Science
• Polymer Chemistry
• Textile Engineering

Background:

• Polyacrylonitrile (PAN) is a primary precursor for carbon fibers, but its high melting point limits processing.
• Melt-spinning offers advantages over traditional solution-spinning for PAN-based precursors.
• Developing melt-processable acrylonitrile copolymers is key to improving carbon fiber production efficiency.

Purpose of the Study:

• To review recent advancements in producing carbon fiber precursors via melt-spun acrylonitrile copolymers.
• To analyze methods for reducing the melting point of PAN and its copolymers.
• To summarize techniques for precursor modification and carbon fiber preparation.

Main Methods:

• Analysis of copolymerization with inert comonomers.
• Investigation of plasticization using solvents, additives, CO2, and ionic liquids.
• Review of preliminary precursor modification for thermal oxidative stabilization.
• Examination of crosslinking methods, particularly irradiation.
• Summary of patent information on melt-spun acrylonitrile copolymer-based carbon fibers.

Main Results:

• Various strategies exist to decrease the melting point of acrylonitrile copolymers, including eco-friendly options.
• Preliminary modifications enable melt-free stabilization and reduce processing time without compromising mechanical properties.
• Irradiation is highlighted as an effective crosslinking method.
• Melt-processable acrylonitrile copolymers are viable precursors for carbon fiber production.

Conclusions:

• Melt-spinning of modified acrylonitrile copolymers presents a promising route for efficient carbon fiber production.
• Further research into eco-friendly plasticizers and optimized stabilization techniques can enhance precursor properties.
• Patented methods indicate industrial interest and feasibility of these advanced precursors.