Abstract: This article detects the content of residual monomer in the PAN spinning solution through gas chromatography, studies the impact of the residual monomer content on the production environment, and analyzes to obtain the minimum standard of the residual monomer content. It studies the effect of the residual monomer on the properties of the spinning solution, and finds that due to the continuous polymerization reaction, the residual monomer acrylonitrile will increase the viscosity and solid content of the spinning solution due to its own reaction. It further studies the impact on the strength and fuzziness of the carbon fiber, and finds that with the reduction of the residual monomer, it will be beneficial to the production of the carbon fiber and the improvement of the performance of the carbon fiber, and analyzes to obtain the requirements for the residual monomer content suitable for the production of carbon fiber. In addition, starting from aspects such as the vacuum degree, temperature, and film surface area in the de-monomerization process, it analyzes the impact of related methods to reduce the residual monomer content, and helps the rationalization of production.

Key words: carbon fiber, polymerization, residual monomers, composites