Crystallization Relationships Between Poly(bis(phenoxy)phosphazene)-(PBPP) Crystals.

Abstract

Whenever solution grown alpha-form (3-D) crystals of PBPP were heated in the thermotropic region between T(1) and Tm (the isotropic temperature) they convert to the 2D pseudohexagonal, delta-form crystals. Upon rapid quenching into liquid nitrogen the delta form frozen-in still remains upon warming to room temperature. Further heating close to T(1) produces a 3-D hexagonal modification (epsilon-form) which is a morphological modification of the monoclinic alpha-form of PBPP confirmed already by electron diffraction measurements.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1987
Accession Number
ADA183247

Entities

People

  • J. H. Magill
  • M. Kojima

Organizations

  • University of Pittsburgh

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Chemistry
  • Crystallization
  • Crystallography
  • Crystals
  • Diffraction
  • Electron Diffraction
  • Engineering
  • Heat Treatment
  • Heating
  • Materials
  • Materials Science
  • Military Research
  • Phase Transformations
  • Phosphazene
  • Polymers
  • Three Dimensional
  • Transition Temperature

Readers

  • Materials Science and Engineering.

Technology Areas

  • Microelectronics