Stabilisierung und Funktionalisierung von Submikrometerfasern hergestellt durch „Green Electrospinning“

Wässrige Acrylatdispersionen wurden durch freie radikalische Emulsionspolymerisation hergestellt. Die Dispersionen wurden durch „Green Electrospinning“ unter der Nutzung von Poly(vinylalkohol) als Matrixpolymer zu Nanofasern weiterverarbeitet. Vernetzte Partikel mit variierender Glasübergangstem...

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Bibliographic Details
Main Author: Giebel, Elisabeth
Contributors: Greiner, Andreas (Prof. Dr.) (Thesis advisor)
Format: Doctoral Thesis
Published: Philipps-Universität Marburg 2012
Online Access:PDF Full Text
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Table of Contents: Aqueous polyacrylate dispersions were prepared by free-radical emulsion polymerization. The dispersions were successively processed to nanofibers by “Green Electrospinning” using poly(vinyl alcohol) as matrix polymer. Cross-linked particles showing varying glass transition temperatures and cross-linking density were prepared by copolymerization of butylacrylate, methylmethacrylate and the crosslinker allylmethacrylat. Crosslinking of unreacted allyl-groups was induced by UV-irradiation. The influence of crosslinking density and glass transition temperature on the structure and mechanical properties of the fibers was investigated. In a second approach methylmethacrylate, butylacrylate and the photocrosslinker 4-methacryloyl-oxy-benzophenone were copolymerized. Electrospinning of these dispersions resulted in fibers with smooth surface structure and good mechanical properties. The fibers were further stabilized by crosslinking induced by UV-irradiation yielding fibers with good thermomechanical properties . Functionalized particles were prepared by emulsion polymerization of 4-methacryloyl-oxy-benzophenone and butylacrylate using the bactericide 2-Methyacryl-oxy-ethyldodecyl dimethyl ammonium bromide as polymerizable tenside. Disintegration of the fibers consisting of cationic charged particles due to electrostatic repulsion was prevented by photo crosslinking of the elctrospun fibers. An antibacterial effect of the nanofibers against E.coli was shown. Surface charged nonwovens were obtained by “Green Electrospinning” of aqueous dispersions with charged particles. These were prepared by using 2-methyacryl-oxy-ethyldodecyl dimethyl ammonium bromide or sodium styrene sulfonate as polymerizable tenside. Depending on the nature of the ionic moieties different materials were coated by layer-by-layer-process including dyes, antibacterial materials, metal oxide particles, silver- and gold nanoparticles.