| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 102 === By using the coaxial electrospinning technique the Nylon 6/Nylon 4,6 core/shell fibers can be produced, and the melt-crystallization of Nylon 6 in the fiber core region was studied. 4 wt% Nylon 6/formic acid and 15 wt% Nylon 4,6/formic acid solutions were delivered to the inner and outer channel of coaxial spinneret for electrospinning to prepare Nylon 6/Nylon 4,6 core/shell fibers. By fixing the flow rate of outer channel (Qs) and changing the flow rate of the inner channel (Qc), uniform fibers with average diameter about 105~120 nm were obtained. And we use the differential scanning calorimetry with a rate 10 oC/min to heat the fibers to 260 oC, and then cool it back to 25 oC to observe the melt-recrystallization behavior of Nylon 6 in the core/shell fibers. We found out that the peak temperature of melt-recrystallization was 210 oC, which is 20 oC higher than that we measured from Nylon 6 cast film of 190 oC. And the crystallinity of Nylon 6 decreased with the Qc used in electrospinning process decreased. By using Fouier transform infrared spectroscopy, we also found out that the melt-recrystallization crystal of Nylon 6 in the core/shell fibers was a form crystal.
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