Nowadays, thanks to the electrospinning process, polymeric fibers in nanoscale diameters (10–500 nm) are easily producible. During the last decade, the electrospinning technique has been greatly investigated and developed. One of the most important fields of study on the electrospinning process is the influence of effective parameters on electrospun nanofibers and nanoweb properties. In this study, using polyamide-6 (PA-6)/formic acid polymer solution, three important parameters of the electrospinning process, including polymer solution concentration, needle-tip-to-collector distance, and needle length, were precisely studied. The solution concentration is a very important parameter that affects the nanowebs’ homogeneity and nanofibers’ diameter evenness. Scanning electron microscopy (SEM) analysis of the electrospun nanowebs showed that among five polymer solution concentrations (5, 10, 15, 20, and 25 wt%), 25 wt% was more suitable and provided the homogeneity and reproducibility of PA-6 nanowebs. It has been found that the needle-tip-to-collector distance had a considerable influence on the nanofibers’ diameter and the nanoweb collection zone. Morphological investigation and statistical studies showed that the nanofibers’ diameter increased with the reduction of the needle-tip-to-collector distance. Moreover, the average diameter of the nanoweb collection zone decreased by the reduction of this distance. The effect of needle length on the nanofibers’ morphology and nanowebs’ collection zone was investigated. Statistical analysis of the obtained results revealed that the increase of needle length significantly increased the average nanofibers’ diameter. Inversely, the diameter of the nanoweb collection zone reduced when needle length increased. All previously mentioned studies helped to define the optimal electrospinning condition to produce the bead-free, non-branched, and homogeneous PA-6 electrospun nanofibers and nanowebs.
In the title compound, C12H12N2O2S, the aromatic rings are oriented at a dihedral angle of 79.48 (4)°. Intramolecular C—H⋯O hydrogen bonds result in the formation of two five-membered rings with envelope conformations. In the crystal structure, intermolecular N—H⋯O hydrogen bonds link the molecules. π–π Contacts between the benzene rings, [centroid–centroid distance = 4.211 (3) Å] may further stabilize the structure.
Spacer fabrics found vast applications as medical textile due to their intrinsic and unique properties such as good air permeability, breathability, compressibility and comfort. The aim of this study is to utilize weft knitted spacer fabric as pressure garment to apply more uniform interface pressure on limb than common commercial fabrics. Initially, different weft knitted spacer fabrics by varying the spacer fabric thickness (0.8, 1.2 and 1.8 mm) and elastane yarn content (25, 30, 35 and 40%) were produced. Then, mean interface pressure was obtained through conducting the Mannequin test. Based on the Mannequin test results, spacer fabrics with similar applied interface pressure to commercial one were selected to perform human limb test. According to the results, the spacer fabric with the thickness of 1.8[Formula: see text] and elastane yarn content of 25% not only applied interface pressure comparable to commercial fabric, but also exhibited the most uniform interface pressure mapping on human limb among those studied. Also experimental results showed the superior performance of spacer knitted fabrics with elastane yarn than the single jersey knitted fabrics as pressure garments.
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