Post-Process Thermal Treatment of Electrospun Poly(ethylene oxide) Fibers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F24%3A63579979" target="_blank" >RIV/70883521:28110/24:63579979 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Post-Process Thermal Treatment of Electrospun Poly(ethylene oxide) Fibers

Popis výsledku v původním jazyce

Poly(ethylene oxide) (PEO) occupies a prominent position among synthetic polymers as it is one of the few that is soluble in water. Besides water, it is soluble in other polar solvents (ethanol, methanol and their combinations), which classifies it as an easily spinnable material. PEO belongs to semicrystalline thermoplastics with melting temperature within the range of 57 to 73 °C, depending on its relative molecular weight and purity. Its relatively low melting temperature and thermochemical stability stand for the main limitation of its application potential. The work deals with developing the crystal structure of electrospun fibrous layers prepared from a solution of PEO in water and in methanol of the same concentration, since its quality directly affects the final properties of the resulting fibres. The prepared fibres were exposed to elevated temperatures for this purpose. The effect of the solvent used on the flow behaviour of the solutions and the resulting fibre structure in terms of shape, diameter and crystalline phase content is also documented in this work. The fibres obtained from the methanol solution had a significantly larger diameter than those prepared from the aqueous solution, although the methanol solution showed a lower viscosity. Thus, the main parameter controlling the diameter of the fibres in this case was the evaporation kinetics of the solvent during elongation in the electric field. Thicker fibres also exhibited a higher crystalline phase content and hence dimensional stability during thermal stress at temperatures close to the melting point. In the case of fibres obtained from aqueous solution, a noticeable surface wrinkling and cracking of the fibres can be observed at 60 °C. However, prolonged time stress at this temperature causes thermo-oxidative degradation in both types of fibre structure.

Název v anglickém jazyce

Post-Process Thermal Treatment of Electrospun Poly(ethylene oxide) Fibers

Popis výsledku anglicky

Poly(ethylene oxide) (PEO) occupies a prominent position among synthetic polymers as it is one of the few that is soluble in water. Besides water, it is soluble in other polar solvents (ethanol, methanol and their combinations), which classifies it as an easily spinnable material. PEO belongs to semicrystalline thermoplastics with melting temperature within the range of 57 to 73 °C, depending on its relative molecular weight and purity. Its relatively low melting temperature and thermochemical stability stand for the main limitation of its application potential. The work deals with developing the crystal structure of electrospun fibrous layers prepared from a solution of PEO in water and in methanol of the same concentration, since its quality directly affects the final properties of the resulting fibres. The prepared fibres were exposed to elevated temperatures for this purpose. The effect of the solvent used on the flow behaviour of the solutions and the resulting fibre structure in terms of shape, diameter and crystalline phase content is also documented in this work. The fibres obtained from the methanol solution had a significantly larger diameter than those prepared from the aqueous solution, although the methanol solution showed a lower viscosity. Thus, the main parameter controlling the diameter of the fibres in this case was the evaporation kinetics of the solvent during elongation in the electric field. Thicker fibres also exhibited a higher crystalline phase content and hence dimensional stability during thermal stress at temperatures close to the melting point. In the case of fibres obtained from aqueous solution, a noticeable surface wrinkling and cracking of the fibres can be observed at 60 °C. However, prolonged time stress at this temperature causes thermo-oxidative degradation in both types of fibre structure.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů