Comparison of two electrospinning processes in obtaining finer polymer nanofibers |
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Authors: | Deng-Guang Yu Jian-Mao Yang Lan Li Ping Lu Li-Min Zhu |
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Institution: | 1.School of Material Science & Engineering,University of Shanghai for Science and Technology,Shanghai,China;2.Research Center for Analysis and Measurement,Donghua University,Shanghai,China;3.College of Chemistry, Chemical Engineering and Biotechnology,Donghua University,Shanghai,China |
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Abstract: | Two different electrospinning processes (traditional single fluid one and a modified coaxial electrospinning with organic
solvent as sheath fluid) are investigated in relation to their capability of producing thinner nanofibers. Both the modified
coaxial electrospinning and single fluid electrospinning can produce thinner nanofibers with polyvinylpyrrolidone (PVP) as
a polymer model and using a poor volatile solvent N, N-dimethylacetamide (DMAc) in different ways. However the traditional
single fluid process was less effective compared to the modified coaxial process, as it suffered more from the limitation
of polymer chain entanglement threshold for maintaining structural uniformity of nanofibers. Using DMAc as sheath fluid in
the modified process facilitated formation of thinner nanofibers without sacrificing their quality. The mechanism should be
that an appropriate DMAc surrounding to the core polymer jet helps to retain it in a fluid state to experience a longer time
electrical drawing, with little adverse influence on the polymer chain entanglements. Nanofiber diameters could also be tailored
in a linear manner using the modified coaxial process simply through manipulating the sheath solvent flow rates. The modified
coaxial process described here extends the capability of electrospinning process and opens a new way to obtain thinner nanofibers
with fine structural uniformity. |
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