Functionalization of lyocell fibers with TiO2, SiO2, and GLYMO |
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| Authors: | Nika Veronovski Majda Sfiligoj-Smole |
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| Institution: | 1.University of Maribor, Characterization and Processing of Polymers Laboratory, Faculty of Mechanical Engineering,University of Maribor,Maribor,Slovenia |
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| Abstract: | In the research self-cleaning coatings based on photocatalytically active nano titanium dioxide (TiO2) were prepared. When applied directly to cellulose fiber surfaces, TiO2 coatings form weak bonds with fibers. Therefore 3-glycidooxypropyl-trimethoxysilane was used as a coupling agent. It had
been applied on the surface of cellulose fibers before the TiO2 coating was performed. In this case, the silane is in the interface region, where it can be most effective as an adhesion
promoter. Silane coupling agents have unique chemical and physical properties not only to enhance bond strength, but more
importantly to prevent de-bonding at the interface during composite aging and use as well. The coupling agent provides a stable
bond between two otherwise poorly bonding surfaces. Surface properties of these coatings have been examined, such as surface
morphology and surface microstructure. TiO2 nanoparticles were irreversibly attached to the surface of monodisperse silica (SiO2) spheres and to the surface of Lyocell fibers coated with an epoxy-containing silane coupling agent. Analysis using scanning
electron microscopy showed uniform distribution of nanoparticles in the resulting coatings. Fourier transform infrared spectroscopy
revealed changes in the surface microstructure occurring after different modifications. In addition, the influence of photocatalytic
activity on the mechanical properties of Lyocell fibers was determined. In addition to that, the results indicated that SiO2 and the coupling agent provide a protection against high oxidizing power of TiO2 under exposure to daylight irradiation. |
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