Jet evolution and fiber formation mechanism of amylopectin rich starches in centrifugal spinning system

Abstract

This article reports the jet evolution process and fiber formation mechanism of the amylopectin rich starch solution in centrifugal spinning system, and the linear polyvinylpyrrolidone (PVP) is applied to compare with starch solution. The results indicate that jet evolution processes of starch solution include steady state and Rayleigh–Taylor instability over the whole concentration range for the spinnability investigation, which are due to the hyperbranched molecular of amylopectin. As a compression, the linear molecular chain PVP solution expresses a steady state jet under the spinning concentration. The spinnability results show that the obtained starch fibers are always containing the beads due to the Rayleigh–Taylor instability of jet, but can be effectively controlled by solution concentration and amylose/amylopectin. Instead, the PVP fibers show a rapid decreasing of beads till to almost disappear with the increasing of solution concentration, which due to the improvement of chain entanglement increase the steady state portion of jet with the increasing of concentration. The thermal properties of obtained fiber show that fibers obtained from amylose with more thermal stability.

Centrifugal spinning of viscoelastic nanofibres

“…As observed, at short times, the polymer solution is extruded into a straight jet and starts to bend in the anti-rotation direction. With increasing time, the fibre goes through a range of transient shapes, from a pedant drop, to an anti-S shape jet (Li et al 2020), to a necking point, etc. Next, the fibre continues to grow until it finally reaches the steady condition where its trajectory no longer changes with time.…”

“…Although many experimental studies have been dedicated to characterizing the CS process, such as Chen et al (2021), Li et al (2020), Lu et al (2013), Ren et al (2013), Weitz et al (2008), Mary et al (2013), Zhmayev et al (2015) and Ren et al (2015), the experimental investigations require long-term investments of fund and time and, ultimately, they are not able to provide a rigorous prediction of the effects of key flow parameters on the resultant fibre and its web quality. On the other hand, although mathematical modelling of the CS process can provide promising insight into the process, there exist several limitations and constraints that one encounters when using mathematical modelling techniques to address thin viscous fibre flows.…”

Centrifugally spun starch/polyvinyl alcohol ultrafine fibrous membrane as environmentally‐friendly disposable nonwoven

“…40,41 The possible reason was that the initial thinning of liquid jet (jet at the orifice of nozzle) was decreased with the decreasing of solution concentration. 23 As a result, the jet was extended in a larger diameter under the action of centrifugal force, capillary force, elastic and viscous stresses, 40 and the fibers with larger diameters were finally obtained after solvent evaporation.…”

“…19,20 Centrifugal spinning, which originated from cotton candy machine, received a great attention over the past few years due to the capability for nanofiber production with advantages of no polar requirement for spinning solution/melt, high productivity of fibers, controllable fluffy degree of fibrous membranes and orientation of fibers. [21][22][23][24] Till now, a variety of fibers have been successfully fabricated by centrifugal spinning, including polymer based fibers, 25,26 inorganic metal oxide fiber, 27,28 and composite fibers. 29,30 These fibers involved in the applications of tissue engineering, energy conversion/storage, and filtration.…”

Melting centrifugally spun ultrafine poly butylene adipate-co-terephthalate (PBAT) fiber and hydrophilic modification

“…21,23 Based on these, we also further studied the jet motion behavior of the starch solution and polyvinylpyrrolidone (PVP) solution. 24 The results demonstrated that the starch solution usually formed in the jet contain Rayleigh-Taylor instability due to the hyperbranched amylopectin and nally break into drops by reecting on ber membranes as beads. Unlike starch solution, the linear PVP solution could form the jet with stable motion behavior and formed the bers without beads.…”