Thermal Behavior of Polyphosphazenes in Relation to Structure.

Abstract

Differential scanning calorimetry has been employed to characterize polyphosphazene homopolymers. Thermal analysis provided a qualitative and quantitative description of the magnitude of the enthalpies of transition at Tg, T(1) and Tm and the relative change in these temperatures with heating, cooling and time of annealing, too. Aryloxy and alkoxy homopolymers were investigated. Changes in morphology and crystallinity were correlated with thermodynamic parameters to provide a basic understanding of mesophase formation and the conditions which influence the behavior of these flexible liquid crystal-forming macromolecules which have considerable potential technologically. Keywords: DSC thermal properties, Specific heat, Enthalpy of transition, Crystallinity, Mesophases, and Morphology.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 10, 1986
Accession Number
ADA167165

Entities

People

  • D. C. Sun
  • J. H. Magill

Organizations

  • University of Pittsburgh

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Crystal Structure
  • Crystallization
  • Enthalpy Changes
  • Equations Of State
  • Glass Transition Temperature
  • Heat Energy
  • Heat Treatment
  • Macromolecules
  • Materials
  • Materials Science
  • Military Research
  • Phase Transformations
  • Physical Properties
  • Recrystallization
  • Thermodynamics
  • Transition Temperature
  • Transitions

Fields of Study

  • Chemistry

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology