| Titre : |
Fire resistance of polymers |
| Type de document : |
texte imprimé |
| Auteurs : |
Tipanna Melkeri, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 84-90 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Charges (matériaux)
Combustion
Composites à fibres naturelles
Essais (technologie)
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Matériaux hybrides
Polymères -- Additifs
Polymères ignifuges
Résistance à la flamme
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Fire resistance polymers are resistance to degradation at high temperature. Fire resistance polymer is required in construction, electronic and electric equipments. Some fire-safe polymers naturally exhibit an intrinsic resistance to decomposition, while others are synthesized by incorporating fire-resistant additives and fillers. Role of oxygen, heating rate and pressure play vital role in deciding fore resistance of polymer. Solid Phase Char-Formation and Quench & Cool are two mechanisms are involved in fire resistance process. An endothermic environment is created by producing non-combustible products, or add chemicals that would remove fire-propagating radicals (H and OH) etc. These specific chemicals can be added into the polymer molecules permanently or as additives and fillers. The polymers that are most efficient at resisting combustion are those that are synthesized as intrinsically fire-resistant. Halogenated polymers such as PVC and PTFE are best example of intrinsically fire-resistant polymers. Most intrinsically fire-resistant polymers are made by incorporation of aromatic cycles or heterocycles, which lend rigidity and stability to the polymers. Inorganic and sem i-organ ic polymers often employ silicon-nitrogen, boron-nitrogen, and phosphorous -nitrogen monomers. The non-burning characteristics of the inorganic components of these polymers contribute to their controlled flammability. Externally additives are added to improve fire resistance properties. Two types of additives are used namely Reactive flame retardants and Additive flame retardants. Flame-retardant additives and fillers have disadvantages as well. Their poor compatibility, high volatility and other deleterious effects can change properties of polymers. Fire resistance of polymer is evaluated by Limiting oxygen index (LOI), Underwriters Laboratory (UL94), Horizontal Burning Test (94HB), Vertical Burning Test (94V). |
| Note de contenu : |
- Role of oxygen
- Role of heating rate
- Role of pressure
- Mechanisms for flame retardance in plastics
- Natural fiber-containing composites
- Nanocomposites
- Problems with additives and fillers : Limiting oxygen index (LOI)
- Underwriters laboratory (Ul94)
- Horizontal burning test (94HB)
- Vertical burning test (94V) |
| En ligne : |
https://drive.google.com/file/d/1hHdg9YnF_iSohyPyRgZLsYawe4RPeOe8/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35957 |
in PAINTINDIA > Vol. LXXI, N° 4 (04/2021) . - p. 84-90
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Fire resistance of polymers in PAINTINDIA, Vol. LXXI, N° 4 (04/2021)
