Influence of Side-Groups on Thermotropic Behavior of Polyorganophosphazenes

Abstract

Structural and morphological investigations of polyphosphazenes with different kinds of side groups have made in an attempt to understand the T(1) thermotropic transitions. Solution grown crystals and cast films of phosphazene homopolymers were prepared and investigated by DSC, electron microscopy and x-ray diffraction. It has been established that the T(1) and the Tg values are roughly linearly related with the size of side groups. The interplanar distances expressed as d(100) delta in thermotropic state also shows a linear relation with the side group dimensions. Polymorphic forms have been found for most polyphosphazenes that exhibit a T(1) temperature, the location of which is influenced by the side groups.

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Document Details

Document Type
Technical Report
Publication Date
Jul 08, 1988
Accession Number
ADA197852

Entities

People

  • J. H. Magill
  • M. Kojima

Organizations

  • University of Pittsburgh

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Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Diffraction
  • Electron Diffraction
  • Electron Microscopy
  • Engineering
  • Films
  • Glass Transition Temperature
  • Materials
  • Materials Science
  • Military Research
  • Molecules
  • Polymers
  • Scattering
  • Transition Temperature
  • Two Dimensional
  • X Rays
  • X-Ray Diffraction

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  • Materials Science and Engineering.
  • Polymer Science and Technology

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  • Microelectronics