Method for regulating composition and structure of mesophase pitch through thermal copolymerization reaction

Abstract

The invention relates to a method for regulating the composition and structure of mesophase pitch through a thermal copolymerization reaction. The method comprises the following steps: firstly, addingan aromatic active component containing a branched chain into high-aromaticity fused ring pitch, so as to ensure that a pitch material is uniformly mixed at a thermal state; secondly, ensuring that the uniformly mixed pitch material is subjected to self pressure boost in a closed container, so as to be subjected to thermal copolymerization reaction; thirdly, performing melt spinning treatment, oxidation resistance non-melting treatment and high-temperature carbonization treatment on mesophase pitch obtained through thermal copolymerization reaction, so as to obtain mesophase pitch based carbon fiber. Through the regulation of the composition and the structure of the mesophase pitch material, the purpose of reducing of the splitting degree of the mesophase pitch based carbon fiber is realized, so that the structure and the performance of the carbon fiber are improved.

Description

technical field [0001] The invention belongs to the technical field of mesophase pitch-based carbon fibers, and in particular relates to a method for regulating the composition and structure of mesophase pitch through cothermal polymerization. Background technique [0002] Mesophase pitch is an aggregate of condensed ring aromatic hydrocarbons with regular and orderly molecular arrangement. It has the advantages of high carbon yield, melt-controlled orientation, and easy graphitization. It is a high-quality precursor raw material for the preparation of high-performance and multi-functional carbon materials. The raw material of spinnable mesophase pitch used as high-performance mesophase pitch-based carbon fiber has the following basic requirements: low heteroatom and ash content, moderate molecular size, narrow molecular weight distribution, uniform molecular structure composition, high aromaticity and condensation degree Low, rich in alkyl short chains and naphthenic groups...

AI Technical Summary

Problems solved by technology

Among them, the molecular orientation degree of the radial radial structure fiber is high, the crystal growth and development are perfect after graphitization treatment, and the crystallite size is large, so it has excellent axial electrical and thermal conductivity. Stress concentration at the center of the circle due to inconsistency with the orientation direction leads to wedge-shaped splitting, which inevitably leads to fiber structure damage and performance degradation