The Origin of Multiple Melting in Polyurethane Block Copolymers

Abstract

The morphology of multiphase polymeric materials is often a strong function of temperature as well as thermal history. For example, the temperatures at which apparent multiple melting endotherms are observed in some materials are found to be sensitive to the thermal annealing conditions. The availability of synchrotron radiation sources makes possible the collection of small and wide angle x-ray scattering data during a differential scanning calorimetry experiment. The technique is applied to examine the possible origins of multiple endotherms and annealing induced morphological changes in segmented polyurethane - poly(ether-ester) copolymers. The results of the polyurethane experiments are compared to thermal-mechanical measurements of softening behavior, from which a number of structure-property relations may be inferred.

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Document Details

Document Type
Technical Report
Publication Date
Mar 27, 1990
Accession Number
ADA220050

Entities

People

  • A. F. Galambos
  • J. T. Koberstein
  • T. P. Russell

Organizations

  • University of Connecticut

Tags

DTIC Thesaurus Topics

  • Block Copolymers
  • Chemical Engineering
  • Connecticut
  • Copolymers
  • Diffraction
  • Macromolecules
  • Materials
  • Materials Science
  • Phase Separation
  • Scattering
  • Softening
  • Softening Point
  • Spectra
  • Thermal Analysis
  • Transitions
  • X Ray Scattering
  • X Rays

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology
  • Systems Analysis and Design

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference
  • Microelectronics