Electrospinning Ethanol–Water Solutions of Poly(Acrylic Acid) : Nonlinear Viscosity Variations and Dynamic Taylor Cone Behavior
| Autor: | Francesco Basoli, Jan P. F. Lagerwall, Margaret W. Frey, Shameek Vats, Lawrence William Honaker |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Materials science
Polymers and Plastics General Chemical Engineering water 02 engineering and technology 010402 general chemistry 01 natural sciences Taylor cone chemistry.chemical_compound Viscosity Materials Chemistry electrospinning polymers Acrylic acid chemistry.chemical_classification Ethanol Organic Chemistry Polymer biochemical phenomena metabolism and nutrition 021001 nanoscience & nanotechnology 6. Clean water Electrospinning 0104 chemical sciences Nonlinear system solvents chemistry Chemical engineering poly(acrylic acid) viscosity ethanol 0210 nano-technology Physical Chemistry and Soft Matter |
| Zdroj: | Macromolecular Materials and Engineering, 307(2) Macromolecular Materials and Engineering 307 (2022) 2 |
| ISSN: | 1438-7492 |
| Popis: | Electrospinning of polymer solutions is a multifaceted process that depends on the careful balancing of many parameters to achieve a desired outcome, in many cases including mixtures of multiple solvents. A systematic study of how the solution viscosity (Formula presented.) —a good probe of solvent–polymer interactions—and the electrospinnability change when poly(acrylic acid) (PAA) is dissolved in ethanol–water mixtures at varying mixing ratio is carried out. A pronounced maximum is found in (Formula presented.) at a water-to-ethanol molar ratio of about 2:1, where the solvent mixture deviates maximally from ideal mixing behavior and partial deprotonation of carboxyl groups by water coincides synergistically with dissolution of the uncharged protonated PAA fraction by ethanol. The PAA concentration is tuned as a function of water–ethanol ratio to obtain a common value of (Formula presented.) for all solvent mixtures that is suitable for electrospinning. For high PAA content, the Taylor cone grows in volume over time despite minimum solution flow rate, even experiencing surface gelation for ethanol-rich solutions. This is attributed to the hygroscopic nature of PAA, drawing excess water into the Taylor cone from the air during spinning. |
| Databáze: | OpenAIRE |
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