Block Copolymer Based Porous Carbon Fiber-Synthesis, Processing, and Applications

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Carbon materials exhibit diverse properties, with porous carbons offering large surface areas and tunable pore structures for various applications.
• Porous carbon fibers (PCFs) provide hierarchical porosity and enhanced ion transport, but conventional synthesis methods using sacrificial agents lead to nonuniform pores and challenging additive removal.
• Developing controlled synthesis strategies for PCFs is crucial for advancing their performance in emerging technological fields.

Purpose of the Study:

• To explore the use of block copolymer precursors for synthesizing porous carbon fibers (PCFs) with controlled pore structures.
• To investigate the influence of synthesis conditions on the properties of PCFs derived from block copolymers.
• To demonstrate the impact of controlled porosity on PCF performance in applications like energy storage and composites.

Main Methods:

• Synthesis of block copolymer precursors using reversible addition-fragmentation chain transfer (RAFT) polymerization.
• Fabrication of porous carbon fibers from block copolymer precursors via controlled pyrolysis and fiber spinning.
• Characterization of PCF structure, porosity, and properties, including surface area, electrical conductivity, and mechanical performance.

Main Results:

• Block copolymer precursors allow for the preparation of PCFs with tunable pore sizes and narrow pore size distributions.
• PCF properties, including mechanical strength and electrical conductivity, are significantly influenced by block copolymer composition, pyrolysis conditions, and fiber spinning humidity.
• Controlled porosity in PCFs enhances surface area, electrical/ionic conductivity, and polymer-matrix interactions, crucial for targeted applications.

Conclusions:

• Block copolymer-based synthesis offers a superior approach to producing well-defined porous carbon fibers compared to traditional methods.
• Tailoring block copolymer architecture and processing conditions provides precise control over PCF morphology and properties.
• These advanced PCFs hold significant potential for high-performance applications in energy storage, advanced composites, and separation technologies.