1H NMR spectroscopic study of the solution structure of a conjugated polymer

M. Habibur Rahman, Hsin Lung Chen, Show An Chen, Peter P.J. Chu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The structure of poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4- phenylenevinylene] (MEH-PPV) solutions with a number of common deuterated organic solvents was studied by means of 1H NMR spectroscopy. The resonance bands of the polymer backbone protons appear at much lower frequencies in CDCl3 compared to their positions in aromatic solvents. This has been attributed to the π-π self-stacking interaction of the polymer segments in the aliphatic solvent, which is replaced by a polymer-solvent π-π interaction in the aromatic solvents. In mixed solvent systems with an aliphatic solvent component and an aromatic one, the intensities of the polymer resonances pass through a maximum at intermediate solvent compositions. This has been attributed to the minimum aggregation tendency of the polymer at these solvent compositions. The results suggest that a mixed solvent system constituting an aliphatic component and an aromatic component might be a choice for casting films of hairy-rod type conjugated polymers if minimization of aggregate domains in the films is desired.

Original languageEnglish
Pages (from-to)490-495
Number of pages6
JournalJournal of the Chinese Chemical Society
Volume57
Issue number3 B
DOIs
StatePublished - 2010

Keywords

  • Aggregation
  • Conjugated polymer
  • MEH-PPV
  • NMR
  • Pi-pi-stacking
  • Polymer-solvent interaction
  • Solution structure

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