Morphology of thermoplastic polyurethanes by1H spin-diffusion NMR

Mihai A. Voda, Dan E. Demco, Alexandra Voda, Thomas Schauber, Matthias Adler, Thomas Dabisch, Alina Adams, Maria Baias, Bernhard Blümich

Research output: Contribution to journalArticlepeer-review

Abstract

The morphology and domain sizes are reported for a series of thermoplastic polyurethane (TPU) samples with different content in hard segments and the same molecular weight of the soft segments. NMR spin-diffusion experiments were employed with a 1H double-quantum dipolar filter to establish the dominant dimensionality of the spin-diffusion process, which is shown to take place in two and three dimensions for investigated samples. The correlation between mesoscopic and microscopic properties of the TPU samples is discussed. To this purpose the effective volume of the hard domains is correlated with the TPU content of the hard segments and the segmental orientation of the hard segments obtained from the 1H residual dipolar couplings. A semiquantitative model is developed to explain the functional dependence of the residual second van Vleck moment on the effective volume of the hard segments.

Original languageEnglish (US)
Pages (from-to)4802-4810
Number of pages9
JournalMacromolecules
Volume39
Issue number14
DOIs
StatePublished - Jul 11 2006

ASJC Scopus subject areas

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

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