Microphase separation of segmented poly(urethane urea) block copolymers

J. T. Garrett, J. Runt, J. S. Lin

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182 Scopus citations

Abstract

Two series of well-defined poly(urethane urea) multiblock copolymers were synthesized to investigate the phase-separated morphology of this family of materials. Series I copolymers were synthesized from 2000 g/mol poly(tetramethylene oxide) [PTMO], 4,4′-methylene di(p-phenyl isocyanate) [MDI], and ethylenediamine (EDA), with hard segment contents ranging from 14 to 47 wt %. Series II copolymers (all with hard segment concentrations of 22 wt %) were prepared from the same PTMO and MDI and a diamine mixture of EDA and 1,4-diaminocyclohexane. The microdomain morphology was characterized using small-angle X-ray scattering, and the scattering data were analyzed using the approach of Bonart and Muller. The series I and II copolymers were found to have relatively low overall degrees of phase separation [ranging from approximately 20% at the lowest hard segment contents to greater than 40%], contrary to the common notion that these copolymers are well phase separated materials. The introduction of the second diamine results in reduced phase separation, presumably as a consequence of disruption of hard segment hydrogen bonding.

Original languageEnglish (US)
Pages (from-to)6353-6359
Number of pages7
JournalMacromolecules
Volume33
Issue number17
DOIs
StatePublished - Aug 22 2000

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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