Electrospinning of linear homopolymers of poly(methyl methacrylate): exploring relationships between fiber formation, viscosity, molecular weight and concentration in a good solvent

Gupta, Pankaj; Elkins, Casey L.; Long, Timothy Edward; Wilkes, Garth L.

doi:10.1016/j.polymer.2005.04.021

Cited by 735 publications

(586 citation statements)

References 42 publications

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“…Fiber morphologies are shown to be greatly affected by critical chain overlap concentration. [ 27 ] Thus, as the polymer concentration increases, the overlapping of polymer chains form suffi cient entanglement networks of polymer chains. Bead-free continuous fi bers are formed when the polymer concentration is above the critical concentration.…”

Section: Resultsmentioning

confidence: 99%

Forming of Polymer Nanofibers by a Pressurised Gyration Process

Muthusubramanian

Edirisinghe

2013

Macromol. Rapid Commun.

195

296

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A new route consisting of simultaneous centrifugal spinning and solution blowing to form polymer nanofibers is reported. The fiber diameter (60–1000 nm) is shown to be a function of polymer concentration, rotational speed, and working pressure of the processing system. The fiber length is dependent on the rotational speed. The process can deliver 6 kg of fiber per hour and therefore offers mass production capabilities compared with other established polymer nanofiber generation methods such as electrospinning, centrifugal spinning, and blowing.

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Section: Resultsmentioning

confidence: 99%

Forming of Polymer Nanofibers by a Pressurised Gyration Process

Muthusubramanian

Edirisinghe

2013

Macromol. Rapid Commun.

195

296

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“…The entanglement of polymer chain largely suppresses jet formation [20] and within a certain viscosity range, when the viscosity of polymer solution is increased up to a critical value, the fibre diameter increases as well, and the relaxation time needed for the elongation of polymer jet increases due to the incremental amounts of physical entanglement between polymer chains. Yet the polymer jet could still keep a certain shape post-stretching and finally forms bead free uniform fibre [21,22], but if the viscosity approaches and drops below the critical value, fibres with bead on string structure will be formed. Figure 3 (a-e) shows the bead size/average inter-bead distance distribution and SEM images of products generated by 5 wt%, 10 wt%, 15 wt%, 20 wt% and 25 wt% solutions at 36,000 rpm rotation speed and without the application of any pressure.…”

Section: Fibre Morphologymentioning

confidence: 99%

“…The combination of these two against the solution's surface tension enables fibre formation. Generally, the centrifugal force will increase with higher rotation speed [20], and normal stresses in the non-Newtonian fluid exist, which in contrast to shear stresses, causes the stresses to act in the same direction as the deformation plane [21]. The change in rotation speed during gyration determines the final fibre diameter.…”

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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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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“…On the other hand, when electrospun at 19, 14, 10 and 10 wt% concentrations, uniform nanofibers were produced, as the polymer solution was sufficiently viscous. 24,25 Figure 5 shows the effects of the molecular weight of the polymer and the viscosity of the polymer solution on the nanofiber diameter. Polymers with molecular weights of 1.2Â10 5 , 2.2Â10 5 , 4.2Â10 5 and 5.5Â10 5 were prepared at concentrations of 19, 14, 12 and 10 wt%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation of ultrafine uniform electrospun polyimide nanofiber

Fukushima

Karube

Kawakami

2010

Polym J

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This paper reports the preparation of bead-free ultrafine uniform nanofibers with a narrow fiber diameter distribution from fluorinated polyimide by electrospinning. Increasing the electrical conductivity of polymer solutions by the addition of salts and decreasing the discharge rate of water from the polymer by decreasing the humidity in the surrounding air decreases the diameter of the electrospun nanofiber. Ultrafine uniform nanofibers were achieved using these new salt and humidity conditions, and we successfully prepared bead-free ultrafine uniform nanofibers with a narrow range of nanoscale diameters (33±5 nm). Polymer Journal (2010) 42, 514-518; doi:10.1038/pj.2010.33; published online 28 April 2010Keywords: electrospinning; fluorinated polyimide; humidity; nanofiber; salt INTRODUCTION Nanoscale fibers prepared by the electrospinning method have received a great deal of attention, as electrospinning is capable of producing fibers with diameters in the nanometer range. 1-4 Electrospun nanofibers possess many unique properties including a large specific surface area and superior mechanical properties, and they have potential use as nanoscale building blocks. Nanofibers have been successfully prepared for many applications such as filters, optical and chemical sensors, catalyst systems, scaffolds for tissue regeneration and immobilized enzymes. 5-10 However, the applications are currently somewhat limited by the fact that most electrospun nanofibers are in the form of nonwoven mats composed of disordered nanofibers. Aligned nanofibers can be used in a variety of electrical, optical, mechanical and biomedical applications.Recently, we reported the synthesis of novel nanofibrous fluorinated polyimide membranes using an electrospinning method on a specially designed collector composed of conductive aluminum plates and glass insulator materials that can be removed from the apparatus. 11 The electrospun nanofibers were deposited across the plates and uniaxially aligned to the collector. In addition, multilayer stacked nanofibrous membranes consisting of three-dimensionally ordered nanopores were produced, and the water flux properties of the nanofibrous membranes were measured. The distance between the uniaxially aligned nanofibers decreased with deposition time, and the collector resulted in square nanopores with a regular diameter of approximately 200 nm. The nanopores prepared by the uniaxially aligned nanofibers had a significantly more regular structure than that formed by nonwoven nanofibers.The nanopore size or the distance between the uniaxially aligned nanofibers strongly depended on the nanofiber diameter. Many papers report a uniform nanofiber without beads with a diameter of

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Electrospinning of linear homopolymers of poly(methyl methacrylate): exploring relationships between fiber formation, viscosity, molecular weight and concentration in a good solvent

Cited by 735 publications

References 42 publications

Forming of Polymer Nanofibers by a Pressurised Gyration Process

Forming of Polymer Nanofibers by a Pressurised Gyration Process

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

Preparation of ultrafine uniform electrospun polyimide nanofiber

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