Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 200, Issue -, Pages 339-344Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2018.04.045
Keywords
Molecular orientation; Polarized FT-IR; Electrospinning; Polyimide
Categories
Funding
- National Natural Science Foundation of China [21574060, 21374044]
- Major Special Projects of Jiangxi Provincial Department of Science and Technology [20114ABF05100]
- Technology Plan Landing Project of Jiangxi Provincial Department of Education [GCJ2011-24]
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Quantitative explanation on the improved mechanical properties of aligned electrospun polyimide (PI) nanofibers as the increased imidization temperatures is highly required. In this work, polarized FT-IR spectroscopy is applied to solve this problem. Based on the polarized FT-IR spectroscopy and the molecular model in the fibers, the length of the repeat unit of PI molecule, the angle between the fiber axis and the symmetric stretching direction of carbonyl group on the imide ring, and the angle between the PI molecular axis and fiber axis are all investigated. The Mark-Howink equation is used to calculate the number-average molar mass of PI molecules. The orientation states of PI molecules in the electrospun nanofibers are studied from the number-average molar mass of PI molecules and the average fiber diameter. Quantitative analysis of the orientation factor of PI molecules in the electrospun nanofibers is performed by polarized FT-IR spectroscopy. (C) 2018 Elsevier B.V. All rights reserved.
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