Description: Das Projekt "NaCoPa - Functional Bio-based Nano-coating for Paper Applications" wird vom Umweltbundesamt gefördert und von Universität Freiburg, Fakultät für Umwelt und natürliche Ressourcen, Juniorprofessur für Biobasierte Materialwissenschaften durchgeführt. The development of sustainable paper coatings as a replacement for traditional polymers based on fossil oils, waxes and fluorderivates becomes urgent in view of depleting oil resources and paper recycling. In this project, we propose to control the surface properties of papers by applying an innovative biopolymer coating in combination with nanocellulose additives such as microfibrillated cellulose (MFC) and cellulose nanowhiskers. We aim at controlling barrier-properties water-repellence, gas diffusion and printability of paper surfaces with renewable materials. As the latter can be derived from side-streams of the pulping process, residual materials will be better valorized. Especially, applied and fundamental research will address the following questions : - Can nanoscale additives be processed in combination with a biopolymer and applied to paper surfaces? - How do the coating and coating additives interact with a paperweb as open porous substrate? - What is the influence of the coating topography and chemistry on surface properties and barrier performance (i.e. water repellence and gas diffusion) of coated papers? In a first step, nanoscale coating additives will be produced by mechanical and chemical treatments of pulp residues that include small cellulose fiber rejects. The selection of suitable resources can be made in cooperation with Brazilian partners. The pulp treatment parameters will be tuned in order to narrowly control the morphology of the resulting additives. In a second step, favourable biopolymer matrices such as polylactic acid or polyhydroxyalkanoates will be selected as a matrix material for the coating. The main focus of this project is on improving the compatibility of the nanocomposite coating. At present, favourable processing of such nanocomposites remains one of the main obstructions in their final application. Therefore, extensive examinations of the flow behaviour and interface phenomena will be made by rheological studies. They will allow to get insight in the phase-behaviour of the composite coating and determine processing parameters that are in agreement with industrial application conditions. The coating composition will be optimized to improve the processability: we suggest to adsorb specific hydrophobic moieties at the surface of the nanocellulose additives, or to selectively modify the biopolymer matrix to improve the homogeneous distribution of additives in the coating. Finally, the coating performance will be evaluated in terms of chemical, thermal, mechanical and surface properties. A model will be develop to describe relations between composition, bulk morphology and surface properties to predict to coating performance. As such, we suggest a multidisciplinary approach by combining materials engineering, polymer chemistry, nanotechnology and mechanical sciences in order to provide practical and more fundamental insights in design of nanocomposite coatings.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Papierrecycling ? Freiburg ? Biobasierte Materialien ? Öl ? Verbundwerkstoff ? Polylactid ? Substrat ? Fluss ? Naturpolymer ? Holzstoff ? Altpapier ? Aufschlussverfahren ? Zellulose ? Morphologie ? Polymer ? Polymerchemie ? Zellstoff ? Zusatzstoff ? Anstrich ? Main ? Papier ? Reststoff ? Topographie ? Zellwolle ? Gasförmiger Stoff ? Studie ? Kontrollmaßnahme ? Maschinenbau ? Vertrag ? Werkstoffkunde ? Nicht erneuerbare Ressource ? Bewässerung ? Natürliche Ressourcen ? Eigentum ? Chemische Stoffeigenschaft ? Angewandte Wissenschaft ? Summenparameter ? Wasseroberfläche ? Wasserstand ? Gewässer ? Chemische Aufbereitung ? Kompatibilität ? Ressource ? Faser ? Nanotechnologie ? Rückstand ? Nanomaterialien ? Kenngröße ? Buchgrundstück ? Nanobereich ? Verwertung ? Auslese ?
Region: Baden-Württemberg
Bounding box: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2012-01-01 - 2015-12-31
Accessed 1 times.