Název: Correlation between the onset of beadless character of nanofibrous webs and rheological characteristics of electrospun polymer solutions
Autoři: Zelenková, Jana ; Peer, Petra ; Filip, Petr
Typ dokumentu: Příspěvky z konference
Konference/Akce: International Conference on Nanomaterials - Research & Application /13./ NANOCON, Brno (CZ), 20211020
Rok: 2021
Jazyk: eng
Abstrakt: 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.
Klíčová slova: beadless morphology; nanofibres; polymer concentration; PVDF-co-HFP; rheology
Číslo projektu: LTC19034
Poskytovatel projektu: GA MŠk
Zdrojový dokument: NANOCON 2021 - Conference proceedings, ISBN 978-80-88365-00-6, ISSN 2694-930X
Poznámka: 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

Instituce: Ústav pro hydrodynamiku AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v repozitáři Akademie věd.
Původní záznam: http://hdl.handle.net/11104/0324185

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-508208


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav pro hydrodynamiku
Konferenční materiály > Příspěvky z konference