Microstructural organization of polydimethylsiloxane soft segment polyurethanes derived from a single macrodiol

Taeyi Choi, Jadwiga Weksler, Ajay Padsalgikar, James Runt

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

Segmented polyurethane (PU) block copolymers were synthesized using 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol as hard segments and oligomeric ethoxypropyl polydimethylsiloxane (PDMS) as the soft segments, with hard segment contents ranging from 26 to 52 wt%. The microphase separated morphology, phase transitions, and degrees of phase separation of these novel copolymers were investigated using a variety of experimental methods. Like similar copolymers with mixed ethoxypropyl PDMS/poly(hexamethylene oxide) soft segments, PU copolymers containing only ethoxypropyl PDMS soft segments were found to consist of three microphases: a PDMS matrix phase, hard domains, and a mixed phase containing ethoxypropyl end group segments and dissolved short hard segments. Analysis of unlike segment demixing using small-angle X-ray scattering demonstrates that degrees of phase separation increase significantly as copolymer hard segment content increases, in keeping with findings from Fourier transform infrared spectroscopy measurements.

Original languageEnglish (US)
Pages (from-to)4375-4382
Number of pages8
JournalPolymer
Volume51
Issue number19
DOIs
StatePublished - Sep 2010

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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