Structure Property Characterizations in Segmented Polyurethane Block Copolymers

Abstract

The relationships between microdomain structure and properties in segmented polyurethane elastomers have been elucidated by application of a number of sophisticated characterization techniques. Solid state deuterium NMR spectroscopy was used to explore the degree of phase separation in elastomers based upon 4,4'-diphenylmethane diisocyanate (MDI), butane diol(deuterium labelled)(BDO), and oxyethylene end-capped polyoxypropylene; and to study molecular motions in model hard segments of MDI/BDO and 2,4-toluene diisocyanate/BDO. The influence of morphological transitions on hydrogen bonding in the elastomers was examined by performing Fourier transform infrared spectroscopy simultaneously with a Differential Scanning Calorimeter (DSC) experiment. The origins of multiple endotherms in crystallizable polyurethanes were probed by performing simultaneous Small-Angle X-Ray Scattering (SAXS)/DSC and Wide-Angle X-Ray Diffraction (WAXD)/DSC experiments. Real-time SAXS and WAXD experiments have also been accomplished in order to characterize the kinetics of crystallization and microphase separation.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1986
Accession Number
ADA173581

Entities

People

  • Jeffrey T Koberstein

Organizations

  • Princeton University

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DTIC Thesaurus Topics

  • Availability
  • Biomedical And Dental Materials
  • Block Copolymers
  • Chemical Engineering
  • Classification
  • Contracts
  • Copolymers
  • Diffraction
  • Elements
  • Engineering
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  • Materials
  • Materials Science
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  • Polyurethanes
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Fields of Study

  • Chemistry
  • Materials science

Readers

  • Polymer Science and Technology

Technology Areas

  • Microelectronics