Simple improvements to Gilch synthesis and molecular weight modulation of MEH-PPV

The solvent and temperature used in the Gilch synthesis of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) were varied to achieve an improved set of reaction conditions. A range of molecular weights from 20 to 500 kg mol −1 were obtained in moderate to near-quantitative yields. T...

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Bibliographic Details
Published in:Polymer chemistry 2020-04, Vol.11 (16), p.2831-2837
Main Authors: O'shea, Riley, Wong, Wallace W. H
Format: Article
Language:English
Subjects:
Chemical synthesis
Low molecular weights
Molecular weight
NMR
Nuclear magnetic resonance
Photoluminescence
Polymer chemistry
Polyphenylene vinylene
Solvents
Spectra
Toluene
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Summary:The solvent and temperature used in the Gilch synthesis of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) were varied to achieve an improved set of reaction conditions. A range of molecular weights from 20 to 500 kg mol −1 were obtained in moderate to near-quantitative yields. The best conditions for producing low molecular weight MEH-PPV (32 kg mol −1 , 97% yield) was to use n -pentane as the reaction solvent at 25 °C. For high molecular weight (397 kg mol −1 , 65% yield), toluene at 55 °C gave the best result. The photophysical properties for all MEH-PPV samples were examined and no significant variation was found between samples obtained under different polymerization conditions. The solvent and temperature used in the Gilch synthesis of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) were varied to achieve an improved set of reaction conditions.
ISSN:1759-9954
1759-9962
DOI:10.1039/d0py00072h