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• W155107274 abstract "Recently, intensive studies have been carried out on the preparation of nanostructured materials using a layer-by-layer deposition technique [1, 2]. The inven-tor and pioneer of this method, Gero Decher, has pub -lished a series of papers describing the technique in detail [3-8]. The formation of the first surface layer is usually performed by grafting, chemical modification or strong adsorption. For example, grafting of acrylic acid (AA) onto fiber activated polyester surfaces is an effective method for the deposition of the first acidic layer [9]. When the grafting of the first layer is comple-te, a polymer layer containing basic functional groups can be applied leading to the formation of a stable polymer complex onto which oppositely charged lay-ers can be deposited. These results in the formation of new materials with surface characteristics that reflect the properties of the individual layers applied. Throu-gh an appropriate selection of the layer(s) to be de-posited, the surface properties of the final product co-uld be accurately controlled and thus matched to the requirements of the intended application.Nowadays, the LBL technique is mainly applied to flat (non-textile) surface modifications in order to ob-tain materials with antireflective [10], anticorrosive [11], antibacterial [12], hydrophobic or hydrophilic properties [13, 14].Polyelectrolyte nanolayers can be deposited onto various flat surfaces such as mica [15], glass [16-19], gold [20] or titanium [21], as well as textile fabrics such as: cotton fabric, polypropylene or polyester non-woven, nylon fibers [22-29].Improvement of the applicative properties of the fi-ber surface is of high commercial and industrial impor -tance: polypropylene nonwoven is highly hydropho-bic. In order to improve its wettability, a hydrophilic comb-like poly (ethylene imine) polymer (bPEI) has been deposited onto the nonwoven PP substrates by the LBL method. The chemical structure of the polymer and its ar-chitectural composition are presented in Figure 1. Poly(ethylene imine) has been used in a number of applications in biotechnology, nanomedicine and pharmacy [30-35]. It is, therefore, anticipated that a deeper understanding of the properties of these new composites. It will enable additional practical appli-cations to be identified. Herein we report the results from our studies of three representative samples: sam-ple 1- unmodified PP nonwoven; sample 2- PP non-woven after grafting with AA; sample 3- PP nonwoven with a deposited bPEI layer. Their properties and be-havior will be fully characterized and compared." @default.
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• W155107274 date "2011-01-01" @default.
• W155107274 modified "2023-09-24" @default.
• W155107274 title "Application of the layer-by-layer Deposition Technique to Improve the Hydrophilic Properties of Polypropylene Nonwoven" @default.
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