Abstract
Synergistic effects of two kinds of rare earth oxides (REOs), samarium oxide (Sm2O3) or lanthanum oxide (La2O3) on the intumescent flame retardancy of Nylon 1010/ethylene-vinyl-acetate rubber (EVM) thermoplastic elastomers (TPE) were studied systemically. The limiting oxygen index (LOI) of intumescence flame retardant (IFR)-TPE increased from 30.5 to 32.5 and 34 when 0.5 wt% of IFR was substituted by La2O3 and Sm2O3, respectively. Sm2O3 showed higher synergistic effectivity than La2O3. Cone calorimetry tests confirmed that REOs enhanced flame retardancy of IFR-TPE. Smoke and CO production rate slightly decreased after incorporation of REOs as compared to IFR-TPEs without REOs, indicating relatively reduced combustion hazard. By thermalgravimetric analyses (TGA), it was found that the presence of REOs promoted the esterification and carbonization process in low-temperature range while enhanced the thermal stability of IFR and IFR-TPEs in high-temperature range. X-ray diffraction (XRD) proved that the interaction of Sm2O3 with IFR resulted in the formation of samarium phosphate (SmPO4) with high-thermal stability. Rheological measurements showed that the complex viscosities of the IFR-TPEs increased with the addition of REOs, which might aid in suppressing melt dripping. For mechanical properties, incorporation of REOs led to higher modulus, similar tensile strength but lower elongation at break as compared to IFR-TPEs without REOs.
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Mehrabzadeh M, Delfan N (2000) Thermoplastic elastomers of butadiene-acrylonitrile copolymer and polyamide. VI. Dynamic crosslinking by different systems. J Appl Polym Sci 77:2057–2066
Naskar K, Noordermeer JWM (2005) Thermoplastic elastomers by dynamic vulcanization. Prog Rubber Plast Re 21:1–26
Katbab AA, Hrymak AN, Kasmadjian K (2008) Preparation of interfacially compatibilized PP-EPDM thermoplastic vulcanizate/graphite nanocomposites: effects of graphite microstructure upon morphology, electrical conductivity, and melt rheology. J Appl Polym Sci 107(5):3425–3433
Mansour SA, Al-Ghoury ME, Shalaan E (2010) Thermal Properties of Graphite-Loaded Nitrile Rubber/Poly(vinyl chloride) Blends. J Appl Polym Sci 116(6):3171–3177
Zang Y, Li B, Xu M (2014) Flame retardancy and water resistance of novel intumescent flame-retardant oil-filled styrene-ethylene-butadiene-styrene block copolymer/polypropylene composites. J Appl Polym Sci. doi:10.1002/app.39575
Xue M, Zhang X, Wu Z (2014) A commercial phosphorous-nitrogen containing intumescent flame retardant for thermoplastic polyurethane. J Appl Polym Sci. doi:10.1002/app.39772
Oderkerk J, De Schaetzen G, Goderis B, Hellemans L, Groeninckx G (2002) Micromechanical deformation and recovery processes of Nylon-6/rubber thermoplastic vulcanizates as studied by atomic force microscopy and transmission electron microscopy. Macromolecules 35(17):6623–6629
Oderkerk J, Groeninckx G, Soliman M (2002) Investigation of the deformation and recovery behavior of Nylon-6/rubber thermoplastic vulcanizates on the molecular level by infrared-strain recovery measurements. Macromolecules 35(10):3946–3954
Lu X, Zhang H, Zhang Y (2014) Study on ester-amide exchange reactions between Nylon 1010 and Ethylene-vinyl acetate rubber. J Appl Polym Sci. doi:10.1002/app.40064
Lu X, Zhang H, Zhang Y (2014) Structure and properties of nylon 1010/ethylene-vinyl acetate rubber-based dynamically vulcanized thermoplastic elastomers filled with SiO2. Polym Eng Sci. doi:10.1002/pen.23920
Wu W, Wan C, Zhang Y (2013) Morphology and mechanical properties of ethylene-vinyl acetate rubber/polyamide thermoplastic elastomers. J Appl Polym Sci 130:338–344
Wang B, Tang Q, Hong N (2011) Effect of cellulose acetate butyrate microencapsulated ammonium polyphosphate on the flame retardancy, mechanical, electrical, and thermal properties of intumescent flame-retardant ethylene-vinyl acetate copolymer/microencapsulated ammonium polyphosphate/polyamide-6 blends. ACS Appl Mater Interfaces 3(9):3754–3761
Casu A, Camino G, Giorgi DM, Flath D, Morone V, Zenoni R (1997) Fire-retardant mechanistic aspects of melamine cyanurate in polyamide copolymer. Polym Degrad Stab 58(3):297–302
Huang XH, Li B, Shi BL, Li LP (2008) Investigation on interfacial interaction of flame retarded and glass fiber reinforced PA66 composites by IGC/DSC/SEM. Polymer 49(4):1049–1055
Bourbigot S, Le Bras M, Duquesne S, Rochery M (2004) Recent advances for intumescent polymers. Macromol Mater Eng 289(6):499–511
Yu GX (2009) Esterification over rare earth oxide and alumina promoted SO42-/ZrO2. Catal Today 148(1–2):169–173
Sato S, Takahashi R, Kobune M (2009) Basic properties of rare earth oxides. Appl Catal A: Gen 356(1):57–63
Camino G, Costa L, Trossarelli L (1984) Study of the mechanism of intumescence in fire retardant polymers: Part IV—evidence of ester formation in ammonium polyphosphate-pentaerythritol mixtures. Polym Deg Stab 8(2):13–22
Ren Q, Wan C, Zhang Y (2011) An investigation into synergistic effects of rare earth oxides on intumescent flame retardancy of polypropylene/poly (octylene-co-ethylene) blends. Polym Adv Technol 22(10):1414–1421
Li Y, Li B, Dai J (2008) Synergistic effects of lanthanum oxide on a novel intumescent flame retardant polypropylene system. Polym Deg Stab 93(1):9–16
Almerasa X, Dabrowskia F, Le Brasa M, Delobelb R, Bourbigotc S, Marosid G, Annad P (2002) Using polyamide 6 as charring agent in intumescent polypropylene formulations II. Thermal degradation. Polym Deg Stab 77:315–323
Rivaa A, Camino G, Fomperiec L, Amigouet P (2003) Fire retardant mechanism in intumescent ethylene vinyl acetate compositions. Polym Deg Stab 82:341–346
Lewin M (1999) Synergistic and catalytic effects in flame retardancy of polymeric materials—an overview. J Fire Sci 17:3–19
Almeras X, Le Bras M, Poutch F (2003) Effect of fillers on fire retardancy of intumescent polypropylene blends. Macromol Symp 198(1):435–448
Camino G, Martinasso G, Costa L (1990) Thermal degradation of pentaerythritol diphosphate, model compound for fire retardant intumescent systems: part II-intumescence step. Polym Deg Stab 28(1):17–38
Camino G, Martinasso G, Costa L (1990) Thermal degradation of pentaerythritol diphosphate, model compound for fire retardant intumescent systems: part I-overall thermal degradation. Polym Deg Stab 27(3):285–296
Samyn F, Bourbigot S, Duquesne S (2007) Effect of zinc borate on the thermal degradation of ammonium polyphosphate. Thermochim Acta 456(2):134–144
Fontaine G, Bourbigot S, Duquesne S (2008) Neutralized flame retardant phosphorus agent: facile synthesis, reaction to fire in PP and synergy with zinc borate. Polym Deg Stab 93(1):68–76
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This work was supported by research grants from the National Natural Science Foundation of China (51073092).
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Zhang, H., Lu, X. & Zhang, Y. Synergistic effects of rare earth oxides on intumescent flame retardancy of Nylon 1010/ethylene-vinyl-acetate rubber thermoplastic elastomers. J Polym Res 22, 21 (2015). https://doi.org/10.1007/s10965-014-0652-8
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DOI: https://doi.org/10.1007/s10965-014-0652-8