Characterization of poly(methyl methacrylate) nanofiber mats by electrospinning process

Köysüren, Özcan; Köysüren, Hafize Nagehan

doi:10.1080/10601325.2016.1224627

Cited by 11 publications

(12 citation statements)

References 22 publications

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“…Regarding PC fibers [76], almost 20° difference in contact angle was observed for fibers with diameter of 1.6 µm smaller than what we produced. Additionally, in Figure 3, we showed the results for all electrospun PMMA samples that were actually very similar to previously obtained results for water [51,77] (see Table 5), confirming the same trend of contact angle independence from D f . The contact angle for PLGA, PCL, and PVDF fibers, as reported in Table 5, were almost identical for different D f .…”

Section: Resultssupporting

confidence: 89%

“…As the correlation between D f and wetting contact angle might be affected by polymers variations, we verified it for PMMA only. For PMMA meshes, with three characteristic D f from the first three groups (I-III), we obtained similar contact angles, close to 120° (Figure 4), with water and glycerol, having different D f , (Figure 1b,d,g), like in the previous study [51]. In the case of formamide with the surface tension of 58 mJm −2 with the lowest polar component among all of the liquids that we used for testing (see Table 3), the contact angle drastically decreases, and the liquid percolated into the network of fibers.…”

Section: Resultssupporting

confidence: 87%

“…We found that it was very important how the geometry of electrospun surfaces was validated. The commonly used fiber diameter was not necessarily a convincing parameter unless it was correlated with surface roughness [7,46,50,51,69]. Another important parameter that should be included in the roughness analysis of electrospun surfaces was a fraction of fibers that was strictly correlated with changes of surface free energies of 3D meshes, which was reduced by the air trapped between fibers.…”

Section: Discussionmentioning

confidence: 99%

“…Previously, many studies have shown the effect of increased contact angles, most often for water, for the decreased fiber diameter [7,46], however, the smallest fibers were often with beads and the variations of contact angles were smaller than 10° for the sizes from 0.6 to 2.2 µm [46] and between 3.5 to 8 µm another 10° [7]. Other studies actually showed the opposite, so an increase of contact angle with fibers diameter [50] or no correlation at all with D f [51]. Based on the above-mentioned studies, we tried to identify the range of fiber diameter that should not influence wetting contact angle, so we could focus in our investigation on roughness and fraction of fibers effect on wetting of polymer meshes.…”

Section: Introductionmentioning

confidence: 99%

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Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

et al. 2018

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Wettability of electrospun fibers is one of the key parameters in the biomedical and filtration industry. Within this comprehensive study of contact angles on three-dimensional (3D) meshes made of electrospun fibers and films, from seven types of polymers, we clearly indicated the importance of roughness analysis. Surface chemistry was analyzed with X-ray photoelectron microscopy (XPS) and it showed no significant difference between fibers and films, confirming that the hydrophobic properties of the surfaces can be enhanced by just roughness without any chemical treatment. The surface geometry was determining factor in wetting contact angle analysis on electrospun meshes. We noted that it was very important how the geometry of electrospun surfaces was validated. The commonly used fiber diameter was not necessarily a convincing parameter unless it was correlated with the surface roughness or fraction of fibers or pores. Importantly, this study provides the guidelines to verify the surface free energy decrease with the fiber fraction for the meshes, to validate the changes in wetting contact angles. Eventually, the analysis suggested that meshes could maintain the entrapped air between fibers, decreasing surface free energies for polymers, which increased the contact angle for liquids with surface tension above the critical Wenzel level to maintain the Cassie-Baxter regime for hydrophobic surfaces.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

et al. 2018

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“…This is probably due to the greater resistance of the solution to be stretched by the charges on the electrospinning jet (Dong et al, 2004). The trend of viscosity obtained in this study is similar to the one reported in a number of publications (Ki et al, 2005;Koski et al, 2004).…”

Section: Effect Of Viscosity and Concentrationsupporting

confidence: 90%

Processing parameters for electrospinning poly(methyl methacrylate) (PMMA)/titanium isopropoxide composite in a pump-free setup

Nyangasi¹,

Andala²,

Onindo³

et al. 2018

AAS Open Res

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Background: Electrospinning is a technique for producing nanofibers, useful in many fields of nanotechnology. The size and morphology of the nanofibers obtained depends on the polymer solution properties, the parameters of the equipment and the conditions of the surrounding. In almost all reported electrospinning set ups, a pump ,which regulates the flow of the polymer solution, has been included as one of the requirements. In this study, the effects of solution concentration, viscosity, voltage and the distance from the tip of the syringe to the aluminum collector on the morphology and diameters of poly(methyl methacrylate)(PMMA) fibers were investigated, using a pump-free electrospinning set up. Methods: Varied PMMA concentration (50 -120 mg/mL), voltage (10-18 kV) and distance (5 – 18 cm) of electrospinning were studied and the optimum electrospinning conditions identified. PMMA/ titanium isopropoxide solution of ratio 1:2 was prepared, electrospun at optimized conditions (15 kV, 18 cm, Dichloromethane/Dimethylformamide 60:40) and the fibers obtained analyzed using a scanning electron microscope. Results: Solutions of PMMA whose concentrations were less than 50 mg/mL, produced beads on fibers, whereas those at ~ 100 mg/mL formed the best bead-free fibers of diameter 350±50 nm. The results showed a direct dependence of fiber diameter on the solution viscosity. Fibers of larger diameters were obtained when the distance from the tip of the syringe to the aluminum collector and voltage were increased but at higher distances (>18 kV) fewer fibers were collected. When the voltage was steadily increased, the fibers broadened and the diameters were non-uniform due to splaying and splitting. Increasing the distance between the pipette-tip and the collector from 10 to 18 cm resulted in reduced electric field which in turn yielded fewer fibers. Conclusions: The results obtained in a pump free set-up were comparable to those eletrospun in the presence of a pump.

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Electrospun blends comprised of poly(methyl methacrylate) and ethyl(hydroxyethyl)cellulose functionalized with perichromic dyes

Dreyer

Stock

Nandi

et al. 2020

Carbohydrate Polymers

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Characterization of poly(methyl methacrylate) nanofiber mats by electrospinning process

Cited by 11 publications

References 22 publications

Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

Processing parameters for electrospinning poly(methyl methacrylate) (PMMA)/titanium isopropoxide composite in a pump-free setup

Electrospun blends comprised of poly(methyl methacrylate) and ethyl(hydroxyethyl)cellulose functionalized with perichromic dyes

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