Poly(dimethylsiloxane)-Polyurethane Elastomers: Synthesis and Properties of Segmented Copolymers and Related Zwitterionomers.

Abstract

A series of polyurethane block polymers based on hydroxybutyl-terminated poly(dimethylsiloxane) soft segments of molecular weight 2000 were synthesized. The hard segments consisted of 4,4'-methylenediphenylene diisocyanate (MDI) which was chain extended with either 1,4-butanediol (BD) or N-methyldiethanolamine (MDEA). The MDEA-extended materials were ionized using 1,3-propane sultone. The weight fraction of hard segments was in range 0.13-o.39. The morphology and properties of these polyurethane elastomers were studied by variety of techniques. All of these short segment block copolymers showed nearly complete phase separation. The zwitterionomer materials exhibited ionic aggregation with the hard domains. Hard segment crystallinity or ionic aggregation did not affect the morphology. Hard domain cohesion was found to be a more important factor than hard domain volume fraction in determining the tensile and viscoelastic properties of these elastomers. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1984
Accession Number
ADA148571

Entities

People

  • M. R. Nagarjan
  • P. E. Gibson
  • S. L. Cooper
  • T. G. Grasel
  • Y. Xuehai

Organizations

  • University of Wisconsin–Madison

Tags

Communities of Interest

  • Advanced Electronics
  • Biomedical

DTIC Thesaurus Topics

  • Biomedical And Dental Materials
  • Block Copolymers
  • Block Polymers
  • Chemistry
  • Detectors
  • Glass Transition Temperature
  • Hydrogen
  • Materials
  • Materials Testing
  • Phase
  • Phase Separation
  • Physical Properties
  • Polymeric Films
  • Scattering
  • Spectra
  • Tensile Properties
  • Tensile Strength

Fields of Study

  • Chemistry
  • Materials science

Readers

  • Polymer Science and Technology

Technology Areas

  • Microelectronics