A Study of the Isothermal Crystallization Kinetics of Poly(Bis(Trifluoroethoxy)Phophazene) and Poly(Bis(Phenylphenoxy)Phosphazene).

Abstract

The kinetics of isothermal crystallization of two polyphosphazene polymers, poly(bis(trifluoroethoxy)phosphazene) and poly(bis(phenylphenoxy)phosphazene), have been studied utilizing a modified differential scanning calorimeter (DSC) technique and the depolarized light intensity (DLI) technique. The kinetics of transformation of both and isotropic to 2-D pseudohexagonal mesophase as well as the mesophase to 3-D orthorhombic phases have been measured and analyzed using Avrami theory. Classical nucleation theory has been utilized for estimating values of the surface free energies of the nuclei during crystallization. Keywords: Phenyl radicals. (MJM)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1989
Accession Number
ADA207459

Entities

People

  • J. H. Magill
  • R. J. Ciora Jr.

Organizations

  • University of Pittsburgh

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Crystal Growth
  • Crystallization
  • Crystals
  • Engineering
  • Equations
  • Free Energy
  • Kinetics
  • Materials
  • Measurement
  • Military Research
  • Nitrogen
  • Phase Transformations
  • Three Dimensional
  • Transition Temperature
  • Transitions
  • Two Dimensional

Fields of Study

  • Chemistry

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology