Accession Number : ADA301168

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

Corporate Author : NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH

PDF Url : ADA301168

Report Date : 19 OCT 1995

Pagination or Media Count : 20

Abstract : 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.

Descriptors :   *FIBERS, *X RAY DIFFRACTION, *ACRYLONITRILE POLYMERS, *KINETICS, *PYROLYSIS, VELOCITY, TRANSIENTS, MEASUREMENT, TEMPERATURE, ACTIVATION, MICROSTRUCTURE, DYNAMICS, PARAMETERS, CRYSTAL LATTICES, RESOLUTION, CRYSTALLIZATION, OXIDATION, CHEMICAL REACTIONS, TRANSLATIONS, CHARTS, WIDE ANGLES, CHINA, CHINESE LANGUAGE.

Subject Categories : Textiles
      Physical Chemistry
      Polymer Chemistry
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE