Dissertations / Theses on the topic 'Blend electrospinning'
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Goktas, Ahmet. "Electrospinning Of Polystyrene/butly Rubber Blends: A Parametric Study." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609361/index.pdf.
Full text(i) an AC/DC high voltage equipment which creates high electrical potential, (ii) a syringe, and (iii) a collecting screen. The purpose of this study is to electrospin polystyrene/butyl rubber blends and to investigate the effects of electrospinning parameters on the fibers produced. In this study, polystyrene/butyl rubber blends were electrospun by changing the applied voltage, the tip-to-collector distance, the flowrate, and the butyl rubber content in the fiber. Finally, morphology of electrospun fibers was characterized by SEM. The average fiber diameters varied from 760 nm to nearly 10 µ
m. Increasing butyl rubber content in the fiber resulted in a decrease in the final fiber diameter. Increasing applied voltage also caused a decrease in the final fiber diameter. The tip-to-collector distance did not affect the average fiber diameter. Increasing flowrate yielded fibers with larger diameters. Finally, the addition of non-ionic surfactant decreased the average fiber diameter.
Аврунін, О. Г., O. G. Avrunin, М. Ю. Тимкович, M. Tymkovych, B. Glasmacher, and O. Gryshkov. "Ethylene glycol improves cryopreservation of cell-seeded electrospun scaffolds in cryobags." Thesis, Zalozba FE, 2020. http://openarchive.nure.ua/handle/document/13884.
Full textYan, Han. "Electrospinning-Derived Carbon/Graphite Nanofiber Mats from a Polyimide-Mesophase Pitch Blend Precursor for Flexible Thermal Management Thin Films." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1309678439.
Full textGiani, Niccolò. "Membrane elettrofilate a base di miscele polimeriche per la modifica strutturale di compositi laminati." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16214/.
Full textMafuma, Tendai Simbarashe. "Immobilisation of electric eel acetylcholinesterase on nanofibres electrospun from a nylon and chitosan blend." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001620.
Full textDevadas, Suchitha. "Fabrication of Lignin-Based Nanofibers: Influence of Lignin Type, Blend Ratios, and Total Polymer Concentration." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton160831003121355.
Full textBiber, Erkan. "Production And Characterization Of Nanofibers From Polycaprolactam And Ethylene-butyl Acrylate-maleic Anhydride Terpolymer Mixture." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611870/index.pdf.
Full textMunj, Hrishikesh. "CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1400693315.
Full textChaparro, Francisco Javier. "Biocompatible Electrospun Vehicles To Enhance the Effectiveness Of Anti-Fertility Strategies And Their Biomimetic Properties As Blood Vessel Scaffolds." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1514986344784852.
Full textFavi, Pelagie Marlene. "Electrospun Blends of Polydioxanone and Poly(lactic Acid): Mechanical, Morphological, and Permeability Studies." VCU Scholars Compass, 2007. http://hdl.handle.net/10156/1271.
Full textShah, Parth Nimish. "Biocompatibility Analysis and Biomedical Device Development Using Novel L-Tyrosine Based Polymers." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1238781002.
Full textSpagnuolo, Michael. "Fabrication and Degradation of Electrospun Scaffolds from L-Tyrosine Based Polyurethane Blends for Tissue Engineering Applications." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1304538022.
Full textGuan-JieChen and 陳冠傑. "Electrospinning of poly(N-isopropyl acrylamide) /poly vinyl alcohol blend aqueous solutions." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/5wc835.
Full text國立成功大學
化學工程學系
104
The scope of the research is finding the best parameters of the elcctrospinnig set-up and the electric force profile of the cone-jet by FEA simulation, and discussing the concentration effect and the composition effect of the electrospun fibers from PNIPAM/PVA blend aqueous solutions. We use SEM and TEM to observe the electrospun fibers to find what kind of composite fiber is it. By the research, we find the core-shell composite fiber and which polymer is in the core and shell individually with different composition of blend solutions. Then, we put a charged plate with a hole in the center of it in the electrospinnig system to want to let the electrospun nanofibers can be collected faster and more close to the center of collector, and to keep the jet straight. We also find the Maxima of the electric force profile appear near the cone apex. Finally, we simulate the coaxial electcrospinnig technique and change the difference between the lengths of inner needle and outer needle and the angle of the top of the needle to research the effects of the parameters for getting the stronger electric field and the thinner electrospun fibers.
Huang-HsienChiang and 江奐賢. "Electrospinning of poly(N-isopropyl acrylamide)/poly(D,L-lactic) acid blend solutions in N,N-dimethylformamide solvent." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/5g2dke.
Full textChang, Hui-Yi, and 張慧怡. "Using 2-propanol and water to prepare hydrophobic poly(methyl methacrylate)/poly(vinyl acetate) blend submicron fibers by electrospinning." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7uv5vj.
Full text淡江大學
化學工程與材料工程學系碩士班
107
In this study, it was adopted rubbing alcohol (2-propanol/water) as the solvent to prepare poly(methyl methacrylate) (PMMA) submicron fibers and PMMA/poly(vinyl acetate) (PVAc) blend submicron fibers by the electrospinning technique. The solvents commonly used to dissolve PMMA, such as acetone, tetrahydrofuran, chloroform, toluene, etc., are harmful and environmentally unfriendly. Therefore, the green and economical co-solvent system, 2-propanol + water, were employed. It was found that both PMMA and PMMA/PVAc solutions can be electrospun near room temperature to yield good quality fibers. By controlling the solution concentration and spinning parameters (e.g., voltage, diameter of needle, solution conductivity, etc.) fibers with diameters of 0.5~3 μm were obtainable. In addition, both electrospun PMMA and PMMA/PVAc mats were waterproof and demonstrated superb hydrophobicity with contact angles > 130 °, and the later has higher strength in terms of bendability.
Shau-chiTzeng and 曾紹齊. "Electrospinning of poly(D,L-lactic) acid in N,N-dimethylformamide solvent and poly(N-isopropyl acrylamide/poly(D,L-lactic) acid blend solutions in N,N-dimethylformamide solvent." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/5a9xnx.
Full textValiquette, Dominic. "Électrofilage de fibres à partir de mélanges polystyrène/poly(vinyl méthyl éther)." Thèse, 2009. http://hdl.handle.net/1866/3607.
Full textElectrospinning is a simple method for the preparation of polymer fibers with diameters of hundreds of nanometers to a few micrometers. Although it is a versatile method, some issues remain in the control of the structure and properties of electrospun fibers. In this study, fibers electrospun from polystyrene (PS)/poly(vinyl methyl ether) (PVME) blends were characterized. Differential scanning calorimetry (DSC) revealed that fibers electrospun from benzene are miscible while a phase separation occurs when the fibers are electrospun from chloroform. While films cast from chloroform show poor mechanical properties, immiscible fibers are ductile. The effects of the blend composition and the solvent on the fiber diameter and morphology were observed by scanning electron microscopy (SEM) and optical microscopy. Afterwards, contact angle measurements were made to evaluate the hydrophobicity of the fibers which decreases as hydrophilic PVME is added to the blend; the values for the fibers were found to be 60° higher than their equivalent in films. PVME was selectively removed from the immiscible fibers by complete immersion into water. Infrared spectroscopy revealed that this process increases the PS content from 70 to 95% for immiscible fibers but only to 75% for miscible fibers. These results show that the PVME-rich phase is almost completely distributed on the fiber surface, which was confirmed by atomic force microscopy (AFM) and SEM. Finally, the electrospinning of PS/PVME blends from chloroform/benzene solutions was studied. The presence of chloroform, even as a residual amount, causes a phase separation just as it does in fibers electrospun from pure chloroform.