Improving the Flame Retardant Efficiency of Layer by Layer Coatings Containing Deoxyribonucleic Acid by Post-Diffusion of Hydrotalcite Nanoparticles
Articolo
Data di Pubblicazione:
2017
Citazione:
Improving the Flame Retardant Efficiency of Layer by Layer Coatings Containing Deoxyribonucleic Acid by Post-Diffusion of Hydrotalcite Nanoparticles / F. Carosio, J. Alongi, C. Paravidino, A. Frache. - In: MATERIALS. - ISSN 1996-1944. - 10:7(2017 Jun 27), pp. 709.1-709.12. [10.3390/ma10070709]
Abstract:
This work deals with the use of hydrotalcite nanoparticle post-diffusion in layer by layer
(LbL) coatings with the aim of improving their flame retardant action on cotton. The selected LbL
components, which encompass polydiallyldimethylammonium chloride and deoxyribonucleic acid,
aim at the deposition of an intumescent coating. Infrared spectra pointed out a super-linear growth
of the investigated assembly, indicating the ability to deposit thick coatings while maintaining a
relatively low deposition number. A post-diffusion process, performed by exposing the LbL-treated
fabrics to two different concentrations of hydrotalcite water suspensions (0.1 or 1 wt %), was carried
out to improve the fireproofing efficiency of these coatings. Coatings treated with the lowest
concentration suspension partially swelled as a consequence of their structural rearrangements
while the use of the highest concentration led to nanoparticle aggregates. Horizontal flame spread
tests were used for assessing the achieved flame retardant properties. The post-diffusion performed
at the lowest hydrotalcite concentration lowers the minimum number of Bi-Layers required for
obtaining cotton self-extinguishment while samples treated with the highest concentration showed
detrimental effects on the performances of treated fabrics. This behavior is ascribed to the effects
of hydrotalcite particles on the intumescence of LbL coatings, as evidenced by the morphological
analyses of post-combustion residues.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
layer by layer; cotton; flame retardancy; combustion; hydrotalcite; nanoparticles
Elenco autori:
F. Carosio, J. Alongi, C. Paravidino, A. Frache
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