Journal
APPLIED SPECTROSCOPY
Volume 65, Issue 8, Pages 858-865Publisher
SAGE PUBLICATIONS INC
DOI: 10.1366/11-06235
Keywords
Real-time monitoring; Raman spectroscopy; Polystyrene; Molecular orientation; Electrospinning
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Funding
- National Science Foundation [NSF DMR0704970]
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Real-time Raman spectroscopy was successfully utilized to monitor solvent evaporation and molecular orientation during electrospinning of atactic polystyrene (a-PS). The use of a binary solvent system of N,N-dimethyl formamide (DMF) and tetrahydrofuran (THE) provided a stable, straight jet during the experiment. The prominent Raman bands centered at 866 cm(-1), 914 cm(-1), and 1004 cm(-1), unique to DMF, THE, and a-PS, respectively, were used to monitor solvent concentration changes along the electrospinning jet for two different a-PS solutions. In addition, the changes in relative intensity for the radial skeletal ring vibration of the aromatic group of a-PS at 623 cm I in two different polarization geometries, ZZ and YY, were monitored for orientation information. This study reports the first quantitative vibrational spectroscopic measurement during the electrospinning process. A significant change in concentration and orientation was observed during the process. The changes are explained in relation to the electrospinning process.
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