Phase Separation in Polyurethanes - A Deuterium NMR Study.

Abstract

Solid state deuterium NMR spectroscopy is used to address phase separation i specifically labeled polyurethanes. The hard segment is 4,4'-diphenyl-methane diisocyanate (MDI) chain extended with 2,2,3,3,-D SUB 4 butanediol and the soft segment is polyoxypropylene end-capped with oxyethylene. The samples contain 100, 70, 60 and 50 wt% hard segment. The results show 1) that the core of the hard segment microdomains is identical to the pure hard segment material with respect to molecular motion; 2) that the amount of hard segment in the interfacial regions can be quantified; 3) that the NMR and SAXS data are in good agreement concerning the fraction of interfacial hard segment; and 4) that the interfacial hard segments undergo nearly isotropic motion on a 10,000,000/s time scale, suggesting that there are few long-lived interrurethane hydrogen bonding interactions in the interfacial area. Author keywords include: Polyurethanes; Small Angle X-ray Scattering; Microphase Separation; Deuterium NMR.

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Document Details

Document Type
Technical Report
Publication Date
Feb 18, 1985
Accession Number
ADA151515

Entities

People

  • A. Galambos
  • I. Gancarz
  • J. J. Dumais
  • L. M. Leung
  • L. W. Jelinski

Organizations

  • Princeton University

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Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Chemical Engineering
  • Chemistry
  • Engineering
  • Macromolecules
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Science
  • Military Research
  • New Jersey
  • Phase Separation
  • Polymers
  • Polyurethanes
  • Scattering
  • Synthetic Polymers
  • United States
  • X Ray Scattering

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  • Polymer Science and Technology