Cellulose from wood fibers can be modified for use in flame-retardant composites as an alternative to halogen-based compounds. For this purpose, sulfite dissolving pulp have been chemically by phosphorylation, and the resulting material has used prepare cellulose nanofibrils (CNF) that a width of approximately 3 nm. The phosphorylation was achieved using (NH4)2HPO4 presence urea, degree substitution phosphorus determined X-ray photoelectron spectroscopy, conductometric titration, nuclear...

For the first time, deoxyribonucleic acid (DNA) from herring sperm has been employed as a novel flame retardant system for enhancing thermal stability and properties of cotton fabrics. Indeed, DNA could be considered an intrinsically intumescent it contains three main components that are usually present in formulation, namely: phosphate groups, able to produce phosphoric acid, deoxyribose units acting carbon source blowing agents (upon heating (poly)saccharide dehydrates forming char...

Eco-friendly materials need "green" fire-retardancy treatments, which offer opportunity for new wood nanotechnologies. Balsa (Ochroma pyramidale) was delignified to form a hierarchically structured and nanoporous scaffold mainly composed of cellulose nanofibrils. This nanocellulosic impregnated with colloidal montmorillonite clay nanostructured hybrid high flame-retardancy. The characterized by scanning electron microscopy gas adsorption. Flame-retardancy evaluated cone calorimetry, whereas...

Starch has been employed via layer by assembly for building an efficient and sustainable biobased coatings capable of protecting cotton from fire. In order to obtain a better understanding the coating substrate relationship, efficiency tested on fabrics having different densities (i.e., 100, 200, 400 g/m(2)). The adopted deposition conditions allow buildup homogeneous even at low number steps. physical chemical mechanisms are described related achieved results. can greatly enhance char...

The field of flame retardancy for polymeric materials (i.e. plastics, foams and in particular textiles) is currently facing several changes challenges because some the current halogenated or phosphorus-based retardants (FRs) have proven to be persistent, bioaccumulative, carcinogenic and/or toxic animals humans. Thus, search highly efficient green retardant products, which are exploitable by using simple environmentally-friendly techniques impregnation/exhaustion, layer-by-layer), driving...

For the first time, polyester and polyester–cotton fabrics have been treated with an aqueous suspension of caseins to increase their thermal stability flame retardancy. The effectiveness fabric treatment as well morphology deposited coatings assessed by infrared spectroscopy scanning electron microscopy, respectively. in nitrogen air, resistance a application irradiative heat flux 35 kW/m2, has proven be strongly affected caseins. Indeed, case polyester, remarkable decrease burning rate...

Abstract Polyester (PET), cotton (COT), and two relative blend textile fabrics were treated by sol–gel processes. Tetraethoxysilane (TEOS) was used as inorganic precursor of silica phases; furthermore, different TEOS/H 2 O ratios examined to explore the effect presence SiO on thermal fire stability investigated. The distribution dispersion observed means scanning electronic microscopy (SEM). SEM magnifications showed formation a continuous film located in neighboring fibers; case PET, such...

The toxicity of the most efficient fire retardant additives is a major problem for polymeric materials. Cellulose nanofiber (CNF)/clay nanocomposites, with unique brick-and-mortar structure and prepared by simple filtration, are characterized from morphological point view scanning electron microscopy X-ray diffraction. These nanocomposites have superior protection properties to other clay fiber composites. corresponding mechanisms evaluated in terms flammability (reaction flame) cone...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTuning the Nanocellulose–Borate Interaction To Achieve Highly Flame Retardant Hybrid MaterialsBernd Wicklein*†, Darko Kocjan‡, Federico Carosio§, Giovanni Camino§, and Lennart Bergström*†View Author Information† Department of Materials Environmental Chemistry, Stockholm University, Svante Arrheniusv. 16C, 106 91 Stockholm, Sweden‡ Laboratory Biomolecular Structure, National Institute CoE ENFIST, Hajdrihova 19, 1000 Ljubljana, Slovenia§...

Nanometer thin films consisting of cationic chitosan (Ch), anionic poly(vinylphosphonic acid) (PVPA), and montmorillonite clay (MMT) are deposited on highly porous, wet-stabilized cellulose nanofibril (CNF) aerogels via the layer-by-layer (LbL) technique. Model experiments with silicon oxide surfaces used to study details LbL formation multilayer structure. Formation layers is also investigated as a function solution concentration by use polyelectrolyte titration. Thermogravimetric analysis...

α-Zirconium phosphate nanoplatelets have been alternatively combined with a cationic polyelectrolyte (polydiallyldimethylammonium chloride), polyhedral oligomeric silsesquioxane or alumina-coated silica nanoparticles, exploiting the layer-by-layer deposition. The obtained nanostructured assemblies applied to polyester, poly(ethyleneterephthalate), fabrics in order enhance their thermal and fire stability, particular attention reduction of smokes toxic gases (carbon monoxide produced during...

Pure cellulosic foams suffer from low thermal stability and high flammability, limiting their fields of application.

In this letter, we are presenting a novel approach for the deposition of layer-by-layer (LbL) coatings capable conferring flame retardant properties to flexible polyurethane foams exploiting subsecond times. The process yields nanoscale able reduce by 33% one main fire safety parameters, namely heat release rate peak, with total treatment time only 2.5 s. This new turned out be three 4 orders magnitude faster than conventional LbL treatments. Such results make it possible exploit as...

The highly flammable character of cellulose-rich fibers from wood limits their use in some advanced materials. To suppress the flammability and introduce flame-retardant properties to individual pulp fibers, we deposited nanometer thin films consisting cationic chitosan (CH) anionic poly(vinylphosphonic acid) (PVPA) on using layer-by-layer (LbL) technique. buildup multilayer film was investigated presence absence salt (NaCl) model cellulose surfaces a quartz crystal microbalance Fibers were...

Poly(lactic acid) (PLA) represents one of the most promising and attractive biobased polymer for industrial development environmentally sustainable packaging. However, oxygen water barrier properties PLA based films cannot compete with those commercially available composite multilayers. To fill this gap, we used layer-by-layer deposition technique on thin (30 μm thick) in order to increase their vapor. Nanometric were grown by alternating branched poly(ethylene imine) (BPEI), hydrophobic...