Facile one-pot formation of ceramic fibres from preceramic polymers by pressurised gyration

Muthusubramanian, Shanmugam; Pierin, Giovanni; Colombo, Paolo; Edirisinghe, Mohan

doi:10.1016/j.ceramint.2015.01.065

Cited by 24 publications

(18 citation statements)

References 29 publications

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“…The results here also strongly suggest that the applied pressure has significant influence on the as-spun fibre morphology, and an increased polymer concentration will decrease bead on string formation [26]. With the polymer concentration increasing, the bead size, fibre diameter and average inter-bead distance also increased in both the 10 and 15 wt% solutions at the same forming conditions.…”

Section: Fibre Morphologysupporting

confidence: 65%

“…It also facilitates the volatile solvent (acetone) evaporation that takes place in the radial direction of jets. Hence a sharp separation of solid and liquid phase occurs and this leads to collapse at the surface [26] as shown in Figure 4(b). As shown in Figure 4 (b) and (d), the bead size and inter-bead distance value were positively skewed, and it is obvious that a narrower size distribution was obtained at a higher applied pressure.…”

Section: Fibre Morphologymentioning

confidence: 99%

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Beads, beaded-fibres and fibres: Tailoring the morphology of poly(caprolactone) using pressurised gyration

Hong

Edirisinghe

Muthusubramanian

2016

Materials Science and Engineering: C

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This work focuses on forming bead on string poly(caprolactone) (PCL) by using gyration under pressure. The fibre morphology of bead on string is an interesting feature that falls between bead-free fibres and droplets, and it could be effectively controlled by the rheological properties of spinning dopes and the major processing parameters of the pressurised gyration system which are working pressure and rotating speed. Bead products were not always spherical in shape and tender to be more elliptical, therefore both their width and length were measured. The average bead width and length produced spanned a range 145 -660µm and 140 -1060µm, respectively. The average distance between two adjacent beads (i.e. inter-bead distance) and the bead size (width and length) are shown to be a function of processing parameters and polymer concentration. An interesting morphology i.e. beads with short fibre was observed when using a high polymer concentration. Bead on string structure agglomeration was promoted by a low polymer concentration. Formation of droplets or agglomerated bead on string is promoted below 5wt% polymer concentration, and beads with short fibre were present in the microstructure beyond a polymer concentration of 20 wt%.

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Section: Fibre Morphologysupporting

confidence: 65%

Section: Fibre Morphologymentioning

confidence: 99%

Beads, beaded-fibres and fibres: Tailoring the morphology of poly(caprolactone) using pressurised gyration

Hong

Edirisinghe

Muthusubramanian

2016

Materials Science and Engineering: C

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“…It was experimentally observed that the 3 wt% solution could not be spun into fibers and therefore produced droplets during spinning. The critical polymer concentration and chain entanglement is of crucial importance . The critical polymer concentration for chain entanglement for our PEO can be estimated using the intrinsic viscosity of our PEO [25] and its estimation for PEO using the method of Barnes et al, and is ≈0.7 wt%.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Application of Pressure-Infusion-Gyration to Generate Polymeric Nanofibers

Hong

Muthusubramanian

Edirisinghe

2017

Macromol. Mater. Eng.

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Polymeric nanofibers are a fascinating class of material that has been widely used in a myriad of applications, including fiber reinforced composites, protective clothing, and chemical sensors. Here, the science of the combined application of external pressure, controlled infusion of polymer solution and gyration, which allows mass production of uniform polymeric nanofibers in a single step, is uncovered. Using poly(ethylene oxide) as an example this study shows the use of this novel method to fabricate polymeric nanofibers and nanofibrous mats under different combinations of processing parameters such as working pressure (1 × 10 5 to 3 × 10 5 Pa), rotational speed (10 000-36 000 rpm), infusion rate (500-5000 µL min −1 ), and fiber collection distance (4-15 cm). The morphologies of the nanofibers are characterized using scanning electron microscopy and anisotropy of alignment of fiber is studied using 2D fast Fourier transform analysis. A correlation between the product morphology and the processing parameters is established. The produced fibers are in a range of 50-850 nm at an orifice-to-collector distance of 10 cm. The results indicate that the pressure coupled infusion gyration (PCIG) offers a facile way for forming nanofibers and nanofiber assemblies.

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“…Die entry pressures increase through a change in geometry, rotational velocity, or the addition of an external pressure coupling, such as in the pressurized gyration process . A combination of any of these modifications could potentially widen the overall range of fiber producing viscosities.…”

Section: Discussionmentioning

confidence: 99%

A study of rheological limitations in rotary jet spinning of polymer nanofibers through modeling and experimentation

Rogalski

Botto

Bastiaansen

et al. 2020

J of Applied Polymer Sci

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The recently popularized method of rotary jet spinning (RJS) or centrifugal spinning is investigated to evaluate the rheological limitations of polymer solutions and melts to optimal spinnability. The influence of Newtonian or non-Newtonian behavior of the polymer on spinnability is discussed. We observe that highly viscous polymers tend to block the die channels within a rotary jet spinneret and therefore suggest the use of relatively low Newtonian viscosities of between 1 and 10 Pa s for optimal fiber production. Computational fluid dynamics simulations are used in conjunction with experimental data to establish important processing parameters, such as typical shear rates in the device and optimal polymer melt or solution viscosities. A theoretical model for RJS is compared to measured fiber diameters. The comparison shows that although fiber diameters can be estimated very roughly in the case of polymer solutions, the prediction of fiber diameter in the case of polymer melts require further modeling work.

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Facile one-pot formation of ceramic fibres from preceramic polymers by pressurised gyration

Cited by 24 publications

References 29 publications

Beads, beaded-fibres and fibres: Tailoring the morphology of poly(caprolactone) using pressurised gyration

Beads, beaded-fibres and fibres: Tailoring the morphology of poly(caprolactone) using pressurised gyration

Simultaneous Application of Pressure-Infusion-Gyration to Generate Polymeric Nanofibers

A study of rheological limitations in rotary jet spinning of polymer nanofibers through modeling and experimentation

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