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Morphological, chemical and structural characterization of silica-containing polyvinylpyrrolidone electrospun nanofibers prepared by sol-gel technique

Tański T., Matysiak W., Zaborowska M., Łukowiec D., Krzesiński M.

Journal of Achievements in Materials and Manufacturing Engineering

2016

Vol. 79, nr 1

5--12

Purpose: The aim of this study was to produce poly(vinylpyrrolidone) (PVP) containing silica nanofibers using electrospinning method from 10% PVP/EtOH solutions with different mass concentration 0 and 30% of tetraethoxysilane. Sol-gel technique was used to obtain nanofiber membranes with high amount of inorganic phase. In the case when metal alkoxide, such as tetraethyl orthosilicate (TEOS) is mixed with an organic polymer, hydrolysis and condensation reaction of TEOS occur in-situ with polymer matrix, which allows to fabricate organic-inorganic hybrid structures with uniform dispersion. Design/methodology/approach: The examination of the morphology of the obtained PVP/silicon dioxide nanofibers using scanning electron microscope (SEM) has been made. The chemical structure of produced nanostructures was investigated by Fourier - Transform Infrared spectroscopy (FTIR) and Energy Dispersive Spectrometry (EDX) to analyze the regular dispersion by examining types of bonds occurring between polymer matrix and SiO2 phase. Findings: Results obtained in this paper shows that the mass concentration of the reinforcing phase in form of TEOS have an influence on the average diameter of nanofibers and with the increase of tetraethyl orthosilicate in solution nanofibers diameters decrease. Moreover, structural examination shows uniform dispersion of the reinforcing phase in hybrid materials. Research limitations/implications: Uniform dispersion of the reinforcing phase in silica-containing PVP nanofibers gives the opportunity to make nanowires in calcination process from such obtained fibrous mats and use in novel electrical devices. Originality/value: This paper describes an easy and more effective way of making polymer nanofibers with the content of silicon dioxide with the perspective way of making silica nanowires in the future from obtained hybrid nanofibers, so that this method can replace commonly used nanowires growth processes.

Formowanie włókien poli(kwasu mlekowego) metodą elektroprzędzenia z roztworu w różnych układach rozpuszczalników

Kwiatkowska M., Kozłowski M.

Polimery

2015

T. 60, nr 7-8

480--485

Metodą elektroprzędzenia z roztworu otrzymano włókniny z biodegradowalnego poli(kwasu mlekowego). W badaniach zastosowano różne układy rozpuszczalników. Odpowiedni ich dobór umożliwił wytworzenie włókien zarówno gładkich, jak i porowatych. Topografię powierzchni włókien określono na podstawie analizy mikroskopowej SEM.

Electrospinning of biodegradable poly(lactic acid) fibrous materials has been performed from different solvent mixtures. The fibre surface topography was evaluated using scanning electron microscopy (SEM). By an appropriate selection of the solvent either the smooth or porous fibres have been obtained.