Models for molecular motions within polymer chains. Part 1. A solid-state NMR study of hexane-1,6-diyl bis(p-nitrobenzoate)

J P Kujanpaa, F G Riddell

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1 Citation (Scopus)

Abstract

Solid-state NMR experiments on hexane-1,6-diyl bis(p-nitrobenzoate) and its 1,1,6,6- and 2,2,5,5-deuteriated derivatives present a coherent view of the molecular dynamics of the central alkyl chain. The techniques used include C-13 CP/MAS spectra, H-2 quadrupole echo spectra, associated with measurements of C-13 T-1 rho relaxation times, H-2 and C-13 T-1 relaxation times and quadrupole echo reduction factors. Molecular dynamics in the central chain are dominated by librational motions at the CH2 groups that can best be approximated by a six-site conical model. The activation energies for these librations are ca. 35 kJ mol(-1). gauche-trans flips in the chain can be ruled out as the origin of the effects observed.

Original languageEnglish
Pages (from-to)2225-2231
Number of pages7
JournalJournal of Chemical Society, Perkin Transactions 2
Issue number11
DOIs
Publication statusPublished - 2000

Keywords

  • C-13 CP/MAS NMR
  • H-2 NMR
  • SEGMENTAL DYNAMICS
  • GROUP ROTATION
  • DEUTERON NMR
  • PHASE
  • RELAXATION
  • EXCHANGE
  • SPECTROSCOPY
  • POLYETHYLENE

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