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Research paper thumbnail of H NMR Spectroscopic Study of the Solution Structure of a Conjugated Polymer

The structure of poly[2-methoxy-5-(2¢-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) solutions w... more 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 1 H NMR spectroscopy. The resonance bands of the polymer backbone protons appear at much lower frequencies in CDCl 3 compared to their positions in aromatic solvents. This has been attributed to the p-p self-stacking interaction of the polymer segments in the aliphatic solvent, which is replaced by a polymer-solvent p-p 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.

Research paper thumbnail of H NMR Spectroscopic Study of the Solution Structure of a Conjugated Polymer

The structure of poly[2-methoxy-5-(2¢-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) solutions w... more 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 1 H NMR spectroscopy. The resonance bands of the polymer backbone protons appear at much lower frequencies in CDCl 3 compared to their positions in aromatic solvents. This has been attributed to the p-p self-stacking interaction of the polymer segments in the aliphatic solvent, which is replaced by a polymer-solvent p-p 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.

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