Layer-by-layer modified low density cellulose fiber networks: A sustainable and fireproof alternative to petroleum based foams
| Autor: | Lars Wågberg, Oruç Köklükaya, Verónica López Durán, Federico Carosio |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Cellulose fiber
Materials science Polymers and Plastics Colloidal silica 02 engineering and technology 010402 general chemistry 01 natural sciences Sodium hexametaphosphate chemistry.chemical_compound Materials Chemistry Thermal stability Fiber Layer-by-layer assembly Organic Chemistry Layer by layer 021001 nanoscience & nanotechnology Flame-retardant 0104 chemical sciences Montmorillonite chemistry Chemical engineering 0210 nano-technology Fire retardant |
| Zdroj: | Carbohydrate Polymers. 230:115616 |
| ISSN: | 0144-8617 |
| Popis: | Wood-based cellulose fibers were used to prepare porous, low density and wet-stable fiber networks (FN). Multilayer coatings consisting of chitosan (CH), sodium hexametaphosphate (SHMP) and inorganic nanoparticles comprising of either sodium montmorillonite (MMT), sepiolite (SEP) or colloidal silica (SNP) were deposited by the layer-by-layer (LbL) technique onto FNs in an effort to impart flame-retardancy. A simulated fire scenario measured by cone calorimetry showed that five quadlayers (QL) of CH/SHMP/CH/MMT, CH/SHMP/CH/SEP and CH/SHMP/CH/SNP can produce significant reduction in peak heat release rate (pkHRR). In detail, the coating containing SEP showed the largest reduction of the pkHRR by 47% relative to the uncoated FN. MMT and SEP coated FNs were also able to self-extinguish fire and to retain their shapes after direct exposure to a methane flame. This study hence shows that the LbL assembly is a highly effective way to impart flame-retardant properties to this new type of porous FN. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect