Molecular dynamics study in PU/PBDO anisotropic elastomers by proton NMR relaxometry

A. Taborda, N. Louro, P. J. Sebastião, J. L. Figueirinhas, M. H. Godinho

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work we present a proton spin-lattice relaxation study of the molecular dynamics in an urethane/urea anisotropic elastomer film and in the two precursor pre-polymers, using conventional and fast field cycling NMR techniques. The precursor pre-polymers used were polypropylene oxide with three isocyanate terminal groups (PU) and polybutadiene diol (PBDO). The proton spin-lattice relaxation time T 1 dispersions were obtained at several different temperatures in the frequency range of 4 kHz to 100 MHz. The results show that while the molecular dynamics in the two precursor pre-polymers is well explained by the Rouse model, the solid elastomer film exhibits a relaxation dispersion where regions I, II and III of molten chain dynamics are clearly seen. The solid anisotropic elastomer film shows a molecular dynamical behaviour similar to other isotropic networks.

Original languageEnglish
Pages (from-to)119/[319]-126/[326]
JournalMolecular Crystals and Liquid Crystals
Volume450
Issue number1
DOIs
Publication statusPublished - 1 Jul 2006

Keywords

  • Anisotropic elastomers
  • Molecular dynamics
  • NMR

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