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.

Descriptive Note:

Corporate Author:

NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1995-10-19

Pagination or Media Count:

20.0

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.

Subject Categories:

  • Textiles
  • Physical Chemistry
  • Polymer Chemistry
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE