热稳定化过程中PAN纤维热应力与热化学反应的关联性

The relationships between the thermal stress changes and the thermo-chemical reaction of six different PAN fibers during oxidative stabilization were studied using DSC, FTIR, EA, WAXD, and thermal stress analysis. Results show that the temperature for which a thermal stress begins and the temperature at which it reaches a maximum correlate well with exothermal start and peak temperatures from DSC. This indicates that the changes in thermo-chemical stress can be also used to characterize the speed and extent of the cyclization reaction of the PAN fibers. The changes in the thermal stress peaks can also be correlated with the changes in fiber structure, such as composition, element content, degree of domain orientation, aromatization index and density, implying that thermo-stress can be used control the fiber structure online during a continuous thermal stabilization process.