We study the effect of the gap size on the molecular orientation and crystalline structure of uniaxially well‐aligned nylon‐6 nanofibers produced in the gap between negatively charged metal plates. The relative intensities of several absorbance bands are found to be different in the parallel‐ and perpendicularly polarized FTIR spectra. X‐ray analysis indicates that the metastable γ‐form is predominant in as‐spun nylon‐6 nanofibers, and is transformed into the thermodynamically stable α‐form by increasing the gap size. The polymer chains are thought to be oriented perpendicular to the fiber direction, and the molecular orientation to the fiber axis is enhanced on increasing the gap size. magnified image
We report that the metallized single nanofibers could be successfully prepared by a combined technique of electrospinning and metallization. The mechanical properties of the metallized single nanofibers were investigated by using recently developed tensile test machine. It was found that the metallized single (polyurethane and polystyrene) nanofibers exhibited higher mechanical properties depending on the thickness of the deposited metal layers. For instance, compared with pure PU single nanofibers (Young`s modulus ca. 170 MPa), Young`s modulus for the metallized PU single nanofibers with Cu layers of 30 nm and 50 nm were increased to ca.610 MPa and ca.750 MPa, respectively. Furthermore, the tensile strength of 50 nm Cu-deposited PS single nanofibers (ca. 3.27 GPa) was clearly higher than those of pure PS (ca. 0.76 GPa) and 30 nm Cu-deposited PS (ca. 3.09 GPa) single nanofibers. The results may be attributed to the formation of metallic hard-coating layers onto the surface of single nanofibers.
We studied the effect of gap size on molecular orientation and crystalline structure of theuniaxially well-aligned nylon 6 nanofibers produced in the gap of the negatively charged metal plates. As evidenced by polarized FT-IR spectroscopy, relative intensity in several absorbance bands, including the N-H stretching, amide I, II, and III vibrations were found to be different in the parallel and perpendicular polarized FT-IR spectra. Moreover, X-ray analysis indicated that the metastable γ-form was predominant in the as-spun nylon 6 nanofiber, and was transformed into the thermodynamically stable α-form by increasing the cap size. These results suggested that the polymer chains were oriented perpendicular to the fiber direction. Molecular orientation to the fiber axis was enhanced as increasing the gap size.
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