Method for calculating the degree of cyclization of heat-stabilized polyacrylonitrile fibers by dsc

By fitting the relationship between the heating rate βh and Ti in the DSC method, the calculated degree of cyclization of thermally stabilized polyacrylonitrile fibers was corrected, solving the problem of negative cyclization calculated by the DSC method, thus improving the testing accuracy and the stability of carbon fiber production.

CN122193295APending Publication Date: 2026-06-12ZHONGFU SHENYING CARBON FIBER
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHONGFU SHENYING CARBON FIBER
Filing Date
2026-03-09
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

In the existing technology, when the DSC method is used to determine the degree of cyclization of heat-stabilized polyacrylonitrile fibers, the increased heat of reaction in the early stage of the pre-oxidation reaction leads to a negative value in the calculation, which affects the accuracy of the degree of cyclization calculation and hinders its application in production practice.

Method used

By fitting Ti and PANF data at different heating rates in DSC tests, the relationship between Ti, OF and heating rate βh was obtained. The Ti values ​​of PANF and OF were adjusted to be consistent to eliminate the difference in actual cyclization reaction time. The corrected degree of cyclization was calculated using the formula EOR (%) = (ΔHPANF-ΔHOF)/ΔHPANF.

Benefits of technology

It improves the accuracy of cyclization degree testing, enhances the stability of carbon fiber production and the efficiency of new product development, and reduces human error in data processing.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122193295A_ABST
    Figure CN122193295A_ABST
Patent Text Reader

Abstract

This invention relates to the field of carbon fiber production testing technology, and provides a method for calculating the degree of cyclization of heat-stabilized polyacrylonitrile (PAN) fiber using DSC, comprising: taking heat-stabilized PAN fiber or pre-oxidized fiber (OF) and the corresponding PAN precursor fiber (PANF) for DSC testing; processing the OF and PANF samples using the built-in software of the DSC instrument to obtain the initial temperatures of PANF and OF, respectively. T i,PANF , T i,OF and enthalpy ΔH PANF , ΔH OF PANF was used to test different heating rates. β h Below T i,PANF By fitting the curve, the relationship between the two can be obtained. T i,OF As T i,PANF The rate of correction is obtained by substituting into the relation. β h ;by β h The integral enthalpy of PANF was obtained by DSC testing. ΔH PANF The corrected degree of cyclization using the DSC method is calculated. The method provided by this invention improves the accuracy of cyclization degree testing.
Need to check novelty before this filing date? Find Prior Art