Transport-morphology relationships in segmented polybutadiene polyurethanes: 1. Experimental results

Myrna Serrano*, William J. MacKnight, Edwin L. Thomas, Julio M. Ottino

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The microphase-separated morphology in a series of well characterized polybutadiene polyurethanes with hydroxy-terminated polybutadiene (HTPBD) endcapped with 2,4-toluene diisocyanate (TDI) as the soft segment (SS) phase, and the combination of 2,4-toluene diisocyanate and 1,4-butanediol (BDO) as the hard segment (HS) phase, has been investigated by transmission electron microscopy (TEM) and sorption studies using N2, O2 and CO2. This system constitutes a model segmented polyurethane copolymer composed of amorphous rubbery and glassy domains. Evidence for the presence of phase separation is inferred from the scattering and phase contrast mechanisms of imaging. However, it is not possible to assign specific domain morphologies such as spherical, lamellar or cylindrical, based solely on the results of TEM. Complementary evidence of the domain presence is provided from the transport results; in particular, phase inversion and domain connectivity. Incomplete phase separation was indicated from the combined transport-morphology results for samples with less than 33 wt % hard segment.

Original languageEnglish (US)
Pages (from-to)1667-1673
Number of pages7
JournalPolymer
Volume28
Issue number10
DOIs
StatePublished - Sep 1987

Keywords

  • electron microscopy
  • morphology
  • phase separation
  • polybutadiene polyurethanes
  • transport

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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