Electrospinning of poly(methyl methacrylate) nanofibers in a pump-free process

Abstract

Abstract:The effects of processing parameters, including solution concentration, viscosity, nozzle diameter, voltage bias and the nozzle to collector distance, on the morpho logy and diameters of poly(methyl methacrylate) (PMMA) fibers have been systematically investigated, using a unique pump-free electrospinning method. For PMMA solution concentrations less than the critical entanglement concentration, c e , prolate spheroidshaped droplets or beads with fibers were formed, whereas at concentrations above c e , good quality beadfree fibers were formed. Quantitative analysis revealed a linear dependence between the solution viscosity and fiber diameter. Larger fiber diameters were achieved by increasing the nozzle diameter and voltage bias. Increasing the bias voltage has the additional effect of broadening the diameter distribution, as a result of splaying and splitting. By contrast, when the strength of the electrical field was reduced by increasing the distance between the nozzle and collector, the overall fiber dia meter was reduced.

Light trapping by porous TiO2hollow hemispheres for high efficiency photoelectrochemical water splitting

“…The morphology of the electrosprayed nanostructures critically depends on the strength of the polymer chain interactions, which determines the surface tension generated during the extrusion process. 23,26 Here, a relatively low molecular weight PMMA was used since it has a shorter molecular chain with less entanglement. This encourages the formation of beads instead of fibres as the weak entanglement is insufficient to balance the surface tension.…”

“…This observation is qualitatively in agreement with a previous electrospinning study on nanofibers. 26 Needles with a larger diameter form a wider Taylor cone shape and, hence, a larger HHS diameter. Fig.…”

Chromaticity Properties of Curcuminoids Dye Nanofibers Prepared by Electrospinning for White Light Down-Conversion

“…Different concentrations of the PMMA/DMF (5,10 and 15wt%) were prepared for this study in order to get fibers with different morphologies. The best preparation method to ensure the complete solution of the PMMA in the mixture required enough stirring for 24 hours at room temperature [11,12].…”

Experimental and theoretical study on the electrospinning nanoporous fibers process

“…In order to reduce its local charge per unit surface area, the unstable jet ejects a smaller jet from the surface of the primary jet [28]. In addition, increasing the applied voltage has the additional effect of broadening the diameter distribution, as a result of splaying and splitting [29]. And splay events are more likely to occur for the higher molecular masses.…”