Research on the Characteristics of Dynamic Pyrolysis and the Kinetics ofCyclization for PAN Fibers Using In Situ X-Ray Diffraction Techniques

摘要

This article uses in situ x ray diffraction techniques to study PAN(polyacrylonitrile) preoxidation processes. In a series of resolution charts obtained from wide angle measurements and varying with sample pyrolysis times at different temperatures, calculations are made of sample crystallinities, microcrystalline dimensions, crystal lattice spacing, and aromatization indices. In conjunction with this, explanations are given for the transient cases associated with these parameters following along with changes in experimental conditions. At the same time, descriptions are also done of cyclization kinematics behavior associated with PAN fibers during preoxidation processes. Solutions are made for cyclization reaction speeds and activation parameters at various temperatures.