1,721,145 research outputs found
Layer by Layer assembly of nanostructured coatingsfor flame retardancy and barrier properties
No full textThe present research activity has been focused on surface modifications of polymers in order to enhance their flame retardancy and gas barrier properties. The work has been split into two different topics: i) fabric flame retardancy and ii) gas barrier coatings for packaging applications. Within the first topic different strategies have been applied in order to enhance the flame retardancy of synthetic poly(ethyleneterephthalate) fibres and their blends with cotton. The first strategy deals with the single step nanoparticle adsorption in a finishing-like process. In order to enhance the surface interaction and favor nanoparticle adsorption, a cold plasma surface activation (etching) has been exploited. The aim of this first approach is to evaluate the effectiveness of nanoparticles simple adsorption on fabric combustion properties and the enhancements promoted by the plasma surface activation performed at different processing conditions. Subsequently, the layer by layer assembly technique has been investigated as an evolution of the nanoparticle adsorption. This technique, that consists in a multi-step adsorption process, allows the build-up of coatings made of different kind of nanoparticles and polymers each one bearing a specific functionality. As far as gas barrier coatings are concerned the layer by layer technique applied to a biobased polymer (i.e. polylactic acid) in order to increase its barrier properties towards oxygen and water vapour for food packaging applications. The effects on the final barrier properties of different coating compositions and architectures have been evaluate
Use of nanoparticles for the surface-confined flame retardancy of textiles
No full textThis work describes the surface treatments that can be successfully exploited for assembling nanoparticles on a fabric surface, in order to make them very effective in conferring flame retardant features to the underlying textile. More specifically, sol-gel and layer by layer methods methods are thoroughly discussed, on the basis of recent results achieved by our group. In particular, it is clearly shown that by engineering the fabric surface by layer by layer nano-deposition or by oxidic nanostructures derived from sol-gel synthesis, the polymer combustion can be conveniently slowed down to extinguishment, complying fire safety rules of specific applications, through the creation of a surface barrier to heat and mass transfer across the polymer surfac
Plasma surface activation combined with nanoparticle adsorption to improve flame retardancy of PET fabrics
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Layer by layer assembly of nanoarchitectures to enhance the flame retardancy of PET fabrics
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Layer by Layer assembly of nanoarchitectures to enhance the flame retardancy properties of PET and PET-cotton fabrics
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