Nano coatings - Development of functional nanostructured plastic coatings (2008 - 2011)

Innovative coatings for paper, packaging and textile applications require a unique combination of physical properties, functionality and good processability. Various properties such as hydrophobicity, permeability, adhesion, gloss and print properties can be controlled by the structure of surfaces at micro and / or nanometer scale, without taking the substrate weight dramatically increases. In particular, the formation of self-cleaning surfaces with good mechanical and thermal stability studied by deposition of nanoparticles geïmidiseerde. These nanostructured coatings offer an alternative to traditional surface coatings containing fluorine derivatives or wax.
For a better understanding of the chemical and physical surface properties and interactions at the nanometer scale organic nanoparticles synthesized with different composition and under different reaction conditions, in cooperation with Topchim NV These particles are deposited on various substrates such as paper, cardboard and plastic film. The adhesion of the nanoparticles is studied as a function of substrate type using spectroscopy. The morphology and topography of the nano coating on surfaces studied with an electron microscope (figure 1) and atomic force microscopy (figure 2).

 

SEMpapier  AFMpapier

Figure 1                                                                   Figure 2

The interaction between the nanostructures and the pores in the cellulose matrix provide a porous structure with varying capillary forces and good ink absorption. Contact angle measurements show that the highly hydrophobic coating can be made for use as wrapping paper (figure 3), depending on the combination of roughness on imidisatiegraad and micro to nanoscale. 

nanodeklaag

Figure 3

In a second part to be filled with nanoparticles formed coatings that were formed in the presence of bio-renewable products such as vegetable oils. Different binding mechanisms for holding and the controlled release of fillers on the surface are being investigated. In a further application, the nanostructures on inorganic carriers precipitated so that the coatings obtained additional functionality and the distribution of nanoparticles in macro-porous substrates is better defined.



Duration: 2008-2011

Supported by: FWO

Contact: Prof. Dr. Ir. Gustaaf Schoukens