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Molecular Orientation Evolution and Solvent Evaporation During Electrospinning of Atactic Polystyrene Using Real-Time Raman Spectroscopy

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Abstract:

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 (THF) 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, THF, 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–1 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.

Keywords: ELECTROSPINNING; MOLECULAR ORIENTATION; POLYSTYRENE; RAMAN SPECTROSCOPY; REAL-TIME MONITORING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/11-06235

Affiliations: 1: Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, USA 2: Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, USA. rabolt@udel.edu

Publication date: August 1, 2011

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