Analysis of twist level and take-up speed impact on the tensile properties of PVA/PA6 hybrid nanofiber yarns

Abstract

In this work, polyvinyl alcohol/nylon6 hybrid nanofiber yarns were produced to achieve good properties of each component. The influence of the twist level in the range of 3000–14,666 tpm and take-up speed in the range of 2.5–8.5 cm/min of yarns on the tensile properties was investigated. The highest strength and elongation at break of yarns were achieved in twist level and take-up speed of about 11,000 tpm (8.13±0.72 cN/tex and 72.44±7.64%) and 6.5 cm/min (6.20±0.57 cN/tex and 70.23±7.95%), respectively. Excessive values over these amounts caused a drastic decrement in tensile properties. This could be due to the loss nanofiber arrangement in the yarn structure that was confirmed by the study of orientation of the nanofibers in the yarns by the SEM images. These yarns have the potential to be used in medical applications such as a non-absorbable suture due to the drug loading ability and bio-compatibility properties of PVA nanofibers.

Synthesis and characterization of a novel polyurethane/polypyrrole‐p‐toluenesulfonate (PU/PPy‐pTS) electroactive nanofibrous bending actuator

“…Polymer nanofibers are a class of fibers with diameter less than 1 μm. Because of extremely high specific surface area and highly porous structures provided by nanofibers, they have found use in many areas including sensors and biosensors, tissue engineering, drug delivery, filtration, energy storage, enzyme immobilization, composite reinforcement, protective clothing, sutures, and insulation . Nanofibers have been made using a variety of techniques, among which the electrospinning has generated enormous interest due to its simplicity, versatility, and continuous production capability .…”

Electrospun poly (lactic acid) -cotton core-shell yarns: Processing, morphology, and mechanical properties

“…This increase can be due to the improved cohesion and frictional forces between fibers over twisting. 9,[42][43][44] The Young's modulus also showed a significant increase from around 295 cN/tex for the cotton yarns with α e ∼ 2.8-325 cN/tex for those spun at α e ∼ 3.7 (See Table S1 and Tables S4 and S5).…”

“…However, at very high twist rates, because of increasing the angle of fiber deposition to the yarn axis, a decrease in tensile strength may be occurred. 9,21,[42][43][44] Hence, in the present study, mechanical properties of single cotton and core-shell (cotton-PLA) yarns were investigated to determine the effect of the twist level on the mechanical performance of the electrospun core-shell yarns. Aiming to clarify the contribution of the core yarn on the ultimate mechanical features of the coreshell yarn, besides the rotational speed of the twisting unit during the electrospinning process, the twist level of the core yarn also changed.…”

Electro‐conductive nanofibrous structure based on PGS/PCL coated with PPy by in situ chemical polymerization applicable as cardiac patch: Fabrication and optimization

“…The nanofibers are produced employing various techniques, among which the electrospinning method is of special importance due to the simplicity and the convenient engineering. The nanofibers can be prepared in various forms such as nanocomposite nanofibers mats, nanofibrous yarns, core‐sheath structure, and so on 13–16 . Degradability is one of the key parameters in some end applications such as tissue scaffolding.…”