Original title: Correlation between the onset of beadless character of nanofibrous webs and rheological characteristics of electrospun polymer solutions
Authors: Zelenková, Jana ; Peer, Petra ; Filip, Petr
Document type: Papers
Conference/Event: International Conference on Nanomaterials - Research & Application /13./ NANOCON, Brno (CZ), 20211020
Year: 2021
Language: eng
Abstract: An overwhelming majority of applications of nanofibrous webs requires sufficiently smooth character of nanofibres surface. This character is apart other parameters strongly influenced by a concentration of chosen polymeric material in the solvents. Qualitative attributes roughly depend on the prepared concentration, specifically whether it belongs to one of the four basic regions: dilute, semidilute unentangled, semidilute entangled and concentrated. A concentration separating the latter two regions is often taken as a zero-th approximation indicating an onset of beadless nanofibrous webs. The present contribution uses as a more precise indicator behaviour of so-called phase angle relating viscous and elastic moduli, in other words mutual participation of viscous and elastic components. To this aim three frequently used polymers were used: copolymer of poly(vinylidene fluoride) and hexafluoropropylene (PVDF-co-HFP), poly(ethylene oxide) (PEO) and poly(vinyl butyral) (PVB). For materials exhibiting first a constant behaviour or moderate decrease in a phase angle for lower concentrations, an approximation of the starting concentration is given by a concentration value where a phase angle curve starts to decrease, apparently reflecting a more progressive viscoelastic nature. As shown, such approximation provides relatively very good approximation enabling to eliminate a traditional trial-and-error method.
Keywords: beadless morphology; nanofibres; polymer concentration; PVDF-co-HFP; rheology
Project no.: LTC19034
Funding provider: GA MŠk
Host item entry: NANOCON 2021 - Conference proceedings, ISBN 978-80-88365-00-6, ISSN 2694-930X
Note: Související webová stránka: https://www.confer.cz/nanocon/2021/4375-correlation-between-the-onset-of-beadless-character-of-nanofibrous-webs-and-rheological-characteristics-of-electrospun-solutions

Institution: Institute of Hydrodynamics AS ČR (web)
Document availability information: Fulltext is available in the digital repository of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0324185

Permalink: http://www.nusl.cz/ntk/nusl-508208


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Research > Institutes ASCR > Institute of Hydrodynamics
Conference materials > Papers