Processing of multifunctional polymer composite nanofibers by electrospinning method and their characterization

Date

2025-6-25

Author

Çakar, İlknur

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In the present work, the electrospinning parameters such as solution concentration, solvent type, feed rate, applied voltage and tip-to-collector distance were optimized to produce smooth poly(methyl methacrylate) (PMMA) fibers. Also, the effect of halloysite nanotubes (HNTs), boron phosphate (BPO4) and poly(ethylene glycol) (PEG) addition on the properties of the electrospun fibers was investigated. The produced samples were characterized in terms of their morphologies, burning and thermal behavior, dye adsorption capacities and wettability. The preliminary results demonstrated that the optimal electrospinning parameters were 20 wt.% polymer solution concentration, 1:3 acetone (ACE)/N,N dimethylformamide (DMF) solvent ratio, 25 kV applied voltage, 0.4 ml/h feed rate and 15 cm tip-to-collector distance. Addition of HNT and BPO4 resulted in an increase in average fiber diameter, limiting oxygen index (LOI) and water contact angle of the PMMA-based composite fibers compared to neat PMMA fibers. Conversely, inclusion of PEG into PMMA matrix led to decrease in fiber diameter. The produced fibers were tested for the capability to adsorb methylene blue (MB) and methyl orange (MO) from aqueous solutions. Water contact angle measurements revealed that the addition of additives increased the hydrophobicity. The presence of HNT and BPO4 in the samples led to increase in their methylene blue adsorption capacities. PMMA/PEG-based composite containing 5 wt.% BPO4 was selected for kinetic and isotherm studies. The adsorption kinetics were well described by the pseudo-second-order model, and equilibrium data showed a better fit with the Langmuir model. Additionally, the highest LOI value of 24.5% O2 was obtained for PMMA/1 wt.% BPO4 composite.

Subject Keywords

Electrospinning, Poly(methyl methacrylate), Halloysite nanotubes, Boron phosphate, Poly(ethylene glycol), Dye adsorption

URI

https://hdl.handle.net/11511/115422

Collections

Graduate School of Natural and Applied Sciences, Thesis