Microstructural organization of three-phase polydimethylsiloxane-based segmented polyurethanes

Rebeca Hernandez, Jadwiga Weksler, Ajay Padsalgikar, James Runt

Research output: Contribution to journalArticlepeer-review

145 Scopus citations


Microphase separation is investigated for segmented polyurethane copolymers synthesized from 4,4′-methylenediphenyl diisocyanate and 1,4-butanediol as the hard segments and poly(hexamethylene oxide diol) and hydroxyl-terminated polydimethylsiloxane as soft segments. The neat PDMS-based diol exhibits two segmental relaxations corresponding to the principal repeating unit, Si(CH 3) 2O, and to the hydroxyl end-group segments. When incorporated in the polyurethanes, the siloxane units form their own phase, while the end-group segments are mixed with the second macrodiol and some short hard segment sequences. This is demonstrated by the results of dynamic mechanical analysis and wide-angle X-ray diffraction experiments. The microdomain morphology was characterized principally by small-angle X-ray scattering, and the scattering data were analyzed with a pseudo-two-phase model as well as a modified three-phase core-shell model.

Original languageEnglish (US)
Pages (from-to)5441-5449
Number of pages9
Issue number15
StatePublished - Jul 24 2007

All Science Journal Classification (ASJC) codes

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


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