A novel approach to electrospinning of pristine and aligned MEH-PPV using binary solvents
2019/11/27 21:19:33
Zhong, W., F. Li, L. Chen, Y. W. Chen and Y. Wei
Pristine and aligned electrospun fibers of poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) have been fabricated by electrospinning. The key to success was using a binary solvent system, in which a poor solvent was introduced to increase interchain interactions of MEH-PPV. At the same time, the poor solvent should have a low surface tension and high conductivity. The emission spectra of pristine MEH-PPV in electrospun fibers, spin coating film and dilute solution were acquired and analyzed. The emission anisotropy of aligned electrospun fibers was investigated by polarized emission measurement. For pristine MEH-PPV fibers, the emission anisotropy is 0.47 at emission peak, indicating alignment of MEH-PPV chains along the electrospun fiber axis. For MEH-PPV/poly (epsilon-caprolactone) (PCL) electrospun fibers, the interchain energy transfer in MEH-PPV was significantly depressed. As a result, MEH-PPV/PCL electrospun fibers exhibited a strong blue shift of emission maximum and increased emission anisotropy of 0.66 compared with pristine MEH-PPV electrospun fibers. The ease of electrospinning of pristine MEH-PPV provides new opportunities for its application in unique optoelectronic devices.
- Journal: Journal Of Materials Chemistry
- Volume: 22
- Issue: 12
- Pages: 5523-5530
- ISSN: 0959-9428
- DOI: 10.1039/c2jm15970h
- Year: 2012
- Number:
- Type:
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