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  • Print publication year: 2011
  • Online publication date: August 2011

8 - Flame retardant nanocomposites with polymer blends

from Part II - Flame retardancy



Over the past decades, nanoclays have been widely used as additives to improve the strength as well as the fire performance of polymers, as evidenced by applications and a large number of studies reported in the literature. The mechanism of action of nanoclays is now relatively well understood, despite some aspects remaining unclear, such as the phenomena controlling ignition time. During the burning of polymer nanocomposites, a surface layer is formed on top of the virgin polymer, which acts as a mass and heat shield slowing down mass transfer of pyrolyzed gas to the surface, because less heat is transferred to unpyrolyzed material. Furthermore, in the presence of nanoparticles, the temperature at the surface of the surface layer increases far beyond the so-called ignition temperature of the polymer, which results in increased surface reradiation losses and, hence, decreased heat transfer to the solid. The formation of this surface layer has been observed in a number of studies using the cone calorimeter, where a significant reduction of the peak heat release rate (PHRR) compared with the corresponding pure polymer was observed for relatively thin samples. Zhang, Delichatsios, and Bourbigot also studied the effect of the surface layer numerically, finding that the reduction in heat transfer at the interface of the surface layer and the virgin polymer is inversely proportional to the number of nanoparticles that remain on the surface after degradation of the polymer (if the concentration of nanoparticles is less than about 10%).

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Gilman, J. W.Kashiwagi, T.Morgan, A. B.Harris, R. H.Brassell, L.VanLandingham, M.Jackson, C. L.Flammability of Polymer Clay Nanocomposites Consortium: Year One Annual ReportNational Institute of Standards and Technology 2000
Kashiwagi, T.Grulke, E.Hilding, J.Groth, K.Harris, R.Butler, K.Shields, J.Kharchenko, S.Douglas, J.Thermal and flammability properties of polypropylene/carbon nanotube nanocompositesPolymer 45 2004 4227
Kashiwagi, T.Harris, Jr. R. H.Zhang, X.Briber, R. M.Cipriano, B. H.Raghavan, S. R.Awad, W. H.Shields, J. R.Flame retardant mechanism of polyamide 6–clay nanocompositesPolymer 45 2004 881
Liu, X.Quintiere, J. G.The thick and thin of burning nano-clay–nylonProceedings of the 8th International Symposium on Fire Safety ScienceBostonIntl. Assoc. for Fire Safety Science 2005 647
Wilkie, C. A.Recent advances in fire retardancy of polymer–clay nanocompositesProceedings of the 13th Annual BCC Conference on Flame RetardancyLewin, M.NorwalkBCC Research 2002
Bok, N. J.Charles, A. W.The effect of clay on the thermal degradation of polyamide 6 in polyamide 6/clay nanocompositesPolymer 46 2005 3264
Qin, H.Su, Q.Zhang, S.Zhao, B.Yang, M.Thermal stability and flammability of polyamide 66/montmorillonite nanocompositesPolymer 44 2003 7533
Dabrowski, F.Bourbigot, S.Delobel, R.Le Bras, M.Kinetic modelling of the thermal degradation of polyamide-6 nanocompositeEuropean Polymer Journal 36 2000 273
Zanetti, M.Camino, G.Canavese, D.Morgan, A. B.Lamelas, F. J.Wilkie, C. A.Fire retardant halogen–antimony–clay synergism in polypropylene layered silicate nanocompositesChemistry of Materials 14 2002 189
Fina, A.Bocchini, S.Camino, G.Thermal behavior of nanocomposites and fire testing performanceFire and Polymers V, Materials and Concepts for Fire RetardancyACS Symposium Series No10013Wilkie, C. A.Morgan, A. B.Nelson, G. L.Washington, DCAm. Chem. Soc 2009
Zhang, J.Delichatsios, M.Bourbigot, S.Experimental and numerical study of the effects of nanoparticles on pyrolysis of a polyamide 6 (PA6) nanocomposite in the cone calorimeterCombustion and Flame 156 2009 2056
Robeson, L. M.Polymer Blends: A Comprehensive ReviewGermanyHanser 2007
Utracki, L. A.Polymer Blends Handbook1Dordrecht, the NetherlandsKluwer Academic 2003
Paul, D. R.Bucknall, C. B.Polymer Blends Set: Formulation and PerformanceNew York: Wiley 2000
Chuang, T. H.Guo, W.Cheng, K. C.Chen, S. W.Wang, H. T.Yen, Y. Y.Thermal properties and flammability of ethylene–vinyl acetate copolymer/montmorillonite/polyethylene nanocomposites with flame retardantsJournal of Materials Research 11 2004 169
Sinha Ray, S.Bousmina, M.Compatibilization efficiency of organoclay in an immiscible polycarbonate/poly(methyl methacrylate) blendMacromolecular Rapid Communications 26 2005 450
Sinha Ray, S.Bousmina, M.Effect of organic modification on the compatibilization efficiency of clay in an immiscible polymer blendMacromolecular Rapid Communications 26 2005 1639
Lee, M. H.Dan, C. H.Kim, J. H.Cha, J.Kim, S.Hwang, Y.Lee, C. H.Effect of clay on the morphology and properties of PMMA/poly(styrene-co-acrylonitrile)/clay nanocomposites prepared by melt mixingPolymer 47 2006 4359
Xu, Y.Brittain, W. J.Vaia, R. A.Price, G.Improving the physical properties of PEA/PMMA blends by the uniform dispersion of clay plateletsPolymer 47 2006 4564
Chang, Z.Guo, F.Chen, J.Yu, J.Wang, G.Synergistic flame retardant effects of nanokaolin and nano-HAO on LDPE/EPDM compositesPolymer Degradation and Stability 92 2007 1204
Haurie, L.Fernández, A.Velasco, J.Chimenos, J.Lopez Cuesta, J.Espiell, F.Thermal stability and flame retardancy of LDPE/EVA blends filled with synthetic hydromagnesite/aluminium hydroxide/montmorillonite and magnesium hydroxide/aluminium hydroxide/montmorillonite mixturesPolymer Degradation and Stability 92 2007 1082
Lai, S. M.Li, H. C.Liao, Y. C.Properties and preparation of compatibilized nylon 6 nanocomposites/ABS blends. Part II – Physical and thermal propertiesEuropean Polymer Journal 43 2007 1660
Yu, Z.Yin, J.Yan, S.Xie, Y.Ma, J.Chen, X.Biodegradable poly(L-lactide)/poly(ɛ-caprolactone)-modified montmorillonite nanocomposites: Preparation and characterizationPolymer 48 2007 6439
Elias, L.Fenouillot, F.Majesté, J. C.Cassagnau, P.Morphology and rheology of immiscible polymer blends filled with silica nanoparticlesPolymer 48 2007 6029
Scaffaro, R.Mistretta, M. C.La Mantia, F. P.Compatibilized polyamide 6/polyethylene blend–clay nanocomposites: Effect of the degradation and stabilization of the clay modifierPolymer Degradation and Stability 93 2008 1267
Acharya, H.Kuila, T.Srivastava, S. K.Bhowmick, A. K.Effect of layered silicate on EPDM/EVA blend nanocomposite: Dynamic mechanical, thermal, and swelling propertiesPolymer Composites 29 2008 443
Zhang, J.Hereid, J.Hagen, M.Bakirtzis, D.Delichatsios, M. A.Effects of nanoclay and fire retardants on fire retardancy of a polymer blend of EVA and LDPEFire Safety Journal 44 2009 504
Gcwabaza, T.Sinha Ray, S.Focke, W. W.Maity, A.Morphology and properties of nanostructured materials based on polypropylene/poly(butylene succinate) blend and organoclayEuropean Polymer Journal 45 2009 353
Park, S.Kashiwagi, T.Stemp, D.Koo, J.Si, M.Sokolov, J. C.Rafailovich, M. H.Segregation of carbon nanotubes/organoclays rendering polymer blends self-extinguishingMacromolecules 42 2009 6698
Park, S.Si, M.Koo, J.Sokolov, J. C.Koga, T.Kashiwagi, T.Rafailovich, M. H.Mode-of-action of self-extinguishing polymer blends containing organoclaysPolymer Degradation and Stability 94 2009 306
Nayak, S. K.Mohanty, S.Poly (trimethylene) terephthalate/m-LLDPE blend nanocomposites: Evaluation of mechanical, thermal and morphological behaviourMaterials Science and Engineering A 527 2010 574
Fenouillot, F.Cassagnau, P.Majesté, J. C.Uneven distribution of nanoparticles in immiscible fluids: Morphology development in polymer blendsPolymer 50 2009 1333
Osman, M. A.Ploetze, M.Suter, U. W.Surface treatment of clay minerals – Thermal stability, basal-plane spacing and surface coverageJournal of Materials Chemistry 13 2003 2359
Camino, G.Sgobbi, R.Zaopo, S.Colombier, S.Scelza, C.Investigation of flame retardancy in EVAFire and Materials 24 2000 85
Allen, N. S.Edge, M.Rodriguez, M.Liauw, C. M.Fontan, E.Aspects of the thermal oxidation of ethylene vinyl acetate copolymerPolymer Degradation and Stability 6 2000 363
Beyer, G.Flame retardant properties of EVA-nanocomposites and improvements by combination of nanofillers with aluminium trihydrateFire and Materials 25 2001 193
Manos, T.Yusof, I. Y.Papayannakos, N.Gangas, N. H.Catalytic cracking of polyethylene over clay catalysts: Comparison with an ultrastable Y zeoliteIndustrial and Engineering Chemistry Research 40 2001 2220
Tartaglione, G.Tabuani, D.Camino, G.Moisio, M.PP and PBT composites filled with sepiolite: Morphology and thermal behaviourComposites Science and Technology 68 2008 451
Bourbigot, S.Le Bras, M.Leeuwendal, R.Shen, K. K.Schubert, D.Recent advances of zinc borates in flame retardancy of EVAPolymer Degradation and Stability 64 1999 419
Hornsby, P. R.Rothon, R. N.Fire retardant fillers for polymersFire Retardancy of PolymersLe Bras, M.Wilkie, C.Bourbigot, S.CambridgeRoyal Society of Chemistry 2005