Nozzle‐Pressurized Gyration: A Novel Fiber Manufacturing Process

Abstract

An innovative development of pressurized gyration is presented, incorporating a directional nozzle system. Thus, nozzle-pressurized gyration is used to prepare polymeric fibers. In this work, three different polymeric fibers (polycaprolactone, polyvinylpyrrolidone, and polyethylene oxide) manufactured by the original pressurized gyration and nozzle-pressurized gyration are compared. Under the same processing parameters (working pressure, rotational speed, and collection distance), nozzle-pressurized gyration is proved to be a highly efficient spinning technology for uniform and uniaxially oriented fiber products. The effects of the spinning vessel geometry on the morphology and alignment of gyrospun fibers are elucidated. This work also reveals the relationship between fiber morphology and collection distance in nozzle-pressurized gyration. Varying the collection distance provides a useful approach to the synthesis of uniform fibers with anisotropic arrangement.

Facile One-Step Synthesis of PVDF Bead-on-String Fibers by Pressurized Gyration for Reusable Face Masks

“…This may lead to variances in the degrees of chain entanglement, leading to the lower viscosity of the PVDF solution using 50% acetone. If the surface tension of the solution is too high, the centrifugal force and the gas pressure cannot overcome the surface tension [ 9 , 27 , 28 ]. Thus, polymer jets cannot be formed.…”

“…The relatively large difference in production yield of PG PVDF can be observed (see standard deviations in Figure 10 ), especially for the 25P5A5D sample, which may result from the instability of the polymer flow due to the introduction of airflow. Nevertheless, this problem can be tackled by using a PG setup with nozzles [ 27 ].…”

Pressurized Gyration: Fundamentals, Advancements, and Future

“…Nozzle-pressurized gyration (nozzle-PG), as the name suggests, replaces the small orifices on the PG spinning vessel with external nozzles. [35] Nozzle-PG is the novel sister technology of the Reproduced with permission. [52] Copyright 2022, Elsevier.…”

Casein fibres for wound healing

“…For this study, casein from bovine milk (CAS: 9000-71-9) was obtained from Scientific Laboratory Supplies (Ireland) in powder form. PCL of average Mn 80 000 (CAS: 24980-41-4) was obtained from Sigma-Aldrich (Gillingham, UK) and was used as the carrier polymer to incorporate casein into, the molecular weight being chosen to ensure that the fibres had sufficient polymer chain entanglement and could produce viable fibres [31][32][33][34]. As casein was the main active ingredient and the focus of the study, high loadings of it in solution form would be favourable; for this reason, a high weight loading of 50 wt% casein was prepared by adding casein to a 15% (w/v) solution of PCL, dissolved in chloroform (CAS: 67-66-3), obtained from Sigma-Aldrich (Gillingham, UK).…”