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

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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 19, 1995
Accession Number
ADA301168

Entities

Organizations

  • National Air and Space Intelligence Center

Tags

DTIC Thesaurus Topics

  • Acrylonitrile Polymers
  • Air
  • Air Intelligence
  • Carbon Fibers
  • Chemical Industry
  • Chemical Reactions
  • Crystal Lattices
  • Crystals
  • Diffraction
  • Kinetics
  • Materials Science
  • Measurement
  • Molecules
  • Polymers
  • Translations
  • X Rays
  • X-Ray Diffraction

Readers

  • Materials Science and Engineering.
  • Polymer Science and Engineering.
  • Polymer Science and Technology

Technology Areas

  • Space